From 24aa08f486d7fa7fbfc91b35dd41aadeb0c900da Mon Sep 17 00:00:00 2001
From: Gary Wilson Jr <gary.wilson@gmail.com>
Date: Mon, 21 Jul 2008 16:38:54 +0000
Subject: Refs #7864 -- Updates to documentation for the oldforms/newforms
 switch.  * Moved forms.txt to oldforms.txt  * Moved newforms.txt to forms.txt
  * Updated links and most references to "newforms" (there are a few sections
 that need a more significant rewrite).

git-svn-id: http://code.djangoproject.com/svn/django/trunk@8020 bcc190cf-cafb-0310-a4f2-bffc1f526a37
---
 docs/newforms.txt | 2522 -----------------------------------------------------
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diff --git a/docs/newforms.txt b/docs/newforms.txt
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@@ -1,2522 +0,0 @@
-====================
-The newforms library
-====================
-
-``django.newforms`` is Django's fantastic new form-handling library. It's a
-replacement for ``django.forms``, the old form/manipulator/validation
-framework. This document explains how to use this new library.
-
-Migration plan
-==============
-
-``django.newforms`` is new in Django's 0.96 release, but, as it won't be new
-forever, we plan to rename it to ``django.forms`` in the future. The current
-``django.forms`` package will be available as ``django.oldforms`` until Django
-1.0, when we plan to remove it for good.
-
-That has direct repercussions on the forward compatibility of your code. Please
-read the following migration plan and code accordingly:
-
-    * The old forms framework (the current ``django.forms``) has been copied to
-      ``django.oldforms``. Thus, you can start upgrading your code *now*,
-      rather than waiting for the future backwards-incompatible change, by
-      changing your import statements like this::
-
-          from django import forms             # old
-          from django import oldforms as forms # new
-
-    * In the next Django release (0.97), we will move the current
-      ``django.newforms`` to ``django.forms``. This will be a
-      backwards-incompatible change, and anybody who is still using the old
-      version of ``django.forms`` at that time will need to change their import
-      statements, as described in the previous bullet.
-
-    * We will remove ``django.oldforms`` in the release *after* the next Django
-      release -- either 0.98 or 1.0, whichever comes first.
-
-With this in mind, we recommend you use the following import statement when
-using ``django.newforms``::
-
-    from django import newforms as forms
-
-This way, your code can refer to the ``forms`` module, and when
-``django.newforms`` is renamed to ``django.forms``, you'll only have to change
-your ``import`` statements.
-
-If you prefer "``import *``" syntax, you can do the following::
-
-    from django.newforms import *
-
-This will import all fields, widgets, form classes and other various utilities
-into your local namespace. Some people find this convenient; others find it
-too messy. The choice is yours.
-
-Overview
-========
-
-As with the ``django.forms`` ("manipulators") system before it,
-``django.newforms`` is intended to handle HTML form display, data processing
-(validation) and redisplay. It's what you use if you want to perform
-server-side validation for an HTML form.
-
-For example, if your Web site has a contact form that visitors can use to
-send you e-mail, you'd use this library to implement the display of the HTML
-form fields, along with the form validation. Any time you need to use an HTML
-``<form>``, you can use this library.
-
-The library deals with these concepts:
-
-    * **Widget** -- A class that corresponds to an HTML form widget, e.g.
-      ``<input type="text">`` or ``<textarea>``. This handles rendering of the
-      widget as HTML.
-
-    * **Field** -- A class that is responsible for doing validation, e.g.
-      an ``EmailField`` that makes sure its data is a valid e-mail address.
-
-    * **Form** -- A collection of fields that knows how to validate itself and
-      display itself as HTML.
-
-    * **Media** -- A definition of the CSS and JavaScript resources that are
-      required to render a form.
-      
-The library is decoupled from the other Django components, such as the database
-layer, views and templates. It relies only on Django settings, a couple of
-``django.utils`` helper functions and Django's internationalization hooks (but
-you're not required to be using internationalization features to use this
-library).
-
-Form objects
-============
-
-The primary way of using the ``newforms`` library is to create a form object.
-Do this by subclassing ``django.newforms.Form`` and specifying the form's
-fields, in a declarative style that you'll be familiar with if you've used
-Django database models. In this section, we'll iteratively develop a form
-object that you might use to implement "contact me" functionality on your
-personal Web site.
-
-Start with this basic ``Form`` subclass, which we'll call ``ContactForm``::
-
-    from django import newforms as forms
-
-    class ContactForm(forms.Form):
-        subject = forms.CharField(max_length=100)
-        message = forms.CharField()
-        sender = forms.EmailField()
-        cc_myself = forms.BooleanField(required=False)
-
-A form is composed of ``Field`` objects. In this case, our form has four
-fields: ``subject``, ``message``, ``sender`` and ``cc_myself``. We'll explain
-the different types of fields -- e.g., ``CharField`` and ``EmailField`` --
-shortly.
-
-Creating ``Form`` instances
----------------------------
-
-A ``Form`` instance is either **bound** to a set of data, or **unbound**.
-
-    * If it's **bound** to a set of data, it's capable of validating that data
-      and rendering the form as HTML with the data displayed in the HTML.
-
-    * If it's **unbound**, it cannot do validation (because there's no data to
-      validate!), but it can still render the blank form as HTML.
-
-To create an unbound ``Form`` instance, simply instantiate the class::
-
-    >>> f = ContactForm()
-
-To bind data to a form, pass the data as a dictionary as the first parameter to
-your ``Form`` class constructor::
-
-    >>> data = {'subject': 'hello',
-    ...         'message': 'Hi there',
-    ...         'sender': 'foo@example.com',
-    ...         'cc_myself': True}
-    >>> f = ContactForm(data)
-
-In this dictionary, the keys are the field names, which correspond to the
-attributes in your ``Form`` class. The values are the data you're trying
-to validate. These will usually be strings, but there's no requirement that
-they be strings; the type of data you pass depends on the ``Field``, as we'll
-see in a moment.
-
-If you need to distinguish between bound and unbound form instances at runtime,
-check the value of the form's ``is_bound`` attribute::
-
-    >>> f = ContactForm()
-    >>> f.is_bound
-    False
-    >>> f = ContactForm({'subject': 'hello'})
-    >>> f.is_bound
-    True
-
-Note that passing an empty dictionary creates a *bound* form with empty data::
-
-    >>> f = ContactForm({})
-    >>> f.is_bound
-    True
-
-If you have a bound ``Form`` instance and want to change the data somehow, or
-if you want to bind an unbound ``Form`` instance to some data, create another
-``Form`` instance. There is no way to change data in a ``Form`` instance. Once
-a ``Form`` instance has been created, you should consider its data immutable,
-whether it has data or not.
-
-Using forms to validate data
-----------------------------
-
-The primary task of a ``Form`` object is to validate data. With a bound
-``Form`` instance, call the ``is_valid()`` method to run validation and return
-a boolean designating whether the data was valid::
-
-    >>> data = {'subject': 'hello',
-    ...         'message': 'Hi there',
-    ...         'sender': 'foo@example.com',
-    ...         'cc_myself': True}
-    >>> f = ContactForm(data)
-    >>> f.is_valid()
-    True
-
-Let's try with some invalid data. In this case, ``subject`` is blank (an error,
-because all fields are required by default) and ``sender`` is not a valid
-e-mail address::
-
-    >>> data = {'subject': '',
-    ...         'message': 'Hi there',
-    ...         'sender': 'invalid e-mail address',
-    ...         'cc_myself': True}
-    >>> f = ContactForm(data)
-    >>> f.is_valid()
-    False
-
-Access the ``errors`` attribute to get a dictionary of error messages::
-
-    >>> f.errors
-    {'sender': [u'Enter a valid e-mail address.'], 'subject': [u'This field is required.']}
-
-In this dictionary, the keys are the field names, and the values are lists of
-Unicode strings representing the error messages. The error messages are stored
-in lists because a field can have multiple error messages.
-
-You can access ``errors`` without having to call ``is_valid()`` first. The
-form's data will be validated the first time either you call ``is_valid()`` or
-access ``errors``.
-
-The validation routines will only get called once, regardless of how many times
-you access ``errors`` or call ``is_valid()``. This means that if validation has
-side effects, those side effects will only be triggered once.
-
-Behavior of unbound forms
-~~~~~~~~~~~~~~~~~~~~~~~~~
-
-It's meaningless to validate a form with no data, but, for the record, here's
-what happens with unbound forms::
-
-    >>> f = ContactForm()
-    >>> f.is_valid()
-    False
-    >>> f.errors
-    {}
-
-Accessing "clean" data
-----------------------
-
-Each ``Field`` in a ``Form`` class is responsible not only for validating data,
-but also for "cleaning" it -- normalizing it to a consistent format. This is a
-nice feature, because it allows data for a particular field to be input in
-a variety of ways, always resulting in consistent output.
-
-For example, ``DateField`` normalizes input into a Python ``datetime.date``
-object. Regardless of whether you pass it a string in the format
-``'1994-07-15'``, a ``datetime.date`` object or a number of other formats,
-``DateField`` will always normalize it to a ``datetime.date`` object as long as
-it's valid.
-
-Once you've created a ``Form`` instance with a set of data and validated it,
-you can access the clean data via the ``cleaned_data`` attribute of the ``Form``
-object::
-
-    >>> data = {'subject': 'hello',
-    ...         'message': 'Hi there',
-    ...         'sender': 'foo@example.com',
-    ...         'cc_myself': True}
-    >>> f = ContactForm(data)
-    >>> f.is_valid()
-    True
-    >>> f.cleaned_data
-    {'cc_myself': True, 'message': u'Hi there', 'sender': u'foo@example.com', 'subject': u'hello'}
-
-.. note::
-    **New in Django development version** The ``cleaned_data`` attribute was
-    called ``clean_data`` in earlier releases.
-
-Note that any text-based field -- such as ``CharField`` or ``EmailField`` --
-always cleans the input into a Unicode string. We'll cover the encoding
-implications later in this document.
-
-If your data does *not* validate, your ``Form`` instance will not have a
-``cleaned_data`` attribute::
-
-    >>> data = {'subject': '',
-    ...         'message': 'Hi there',
-    ...         'sender': 'invalid e-mail address',
-    ...         'cc_myself': True}
-    >>> f = ContactForm(data)
-    >>> f.is_valid()
-    False
-    >>> f.cleaned_data
-    Traceback (most recent call last):
-    ...
-    AttributeError: 'ContactForm' object has no attribute 'cleaned_data'
-
-``cleaned_data`` will always *only* contain a key for fields defined in the
-``Form``, even if you pass extra data when you define the ``Form``. In this
-example, we pass a bunch of extra fields to the ``ContactForm`` constructor,
-but ``cleaned_data`` contains only the form's fields::
-
-    >>> data = {'subject': 'hello',
-    ...         'message': 'Hi there',
-    ...         'sender': 'foo@example.com',
-    ...         'cc_myself': True,
-    ...         'extra_field_1': 'foo',
-    ...         'extra_field_2': 'bar',
-    ...         'extra_field_3': 'baz'}
-    >>> f = ContactForm(data)
-    >>> f.is_valid()
-    True
-    >>> f.cleaned_data # Doesn't contain extra_field_1, etc.
-    {'cc_myself': True, 'message': u'Hi there', 'sender': u'foo@example.com', 'subject': u'hello'}
-
-``cleaned_data`` will include a key and value for *all* fields defined in the
-``Form``, even if the data didn't include a value for fields that are not
-required. In this example, the data dictionary doesn't include a value for the
-``nick_name`` field, but ``cleaned_data`` includes it, with an empty value::
-
-    >>> class OptionalPersonForm(Form):
-    ...     first_name = CharField()
-    ...     last_name = CharField()
-    ...     nick_name = CharField(required=False)
-    >>> data = {'first_name': u'John', 'last_name': u'Lennon'}
-    >>> f = OptionalPersonForm(data)
-    >>> f.is_valid()
-    True
-    >>> f.cleaned_data
-    {'nick_name': u'', 'first_name': u'John', 'last_name': u'Lennon'}
-
-In this above example, the ``cleaned_data`` value for ``nick_name`` is set to an
-empty string, because ``nick_name`` is ``CharField``, and ``CharField``\s treat
-empty values as an empty string. Each field type knows what its "blank" value
-is -- e.g., for ``DateField``, it's ``None`` instead of the empty string. For
-full details on each field's behavior in this case, see the "Empty value" note
-for each field in the "Built-in ``Field`` classes" section below.
-
-You can write code to perform validation for particular form fields (based on
-their name) or for the form as a whole (considering combinations of various
-fields). More information about this is in the `Custom form and field
-validation`_ section, below.
-
-Behavior of unbound forms
-~~~~~~~~~~~~~~~~~~~~~~~~~
-
-It's meaningless to request "cleaned" data in a form with no data, but, for the
-record, here's what happens with unbound forms::
-
-    >>> f = ContactForm()
-    >>> f.cleaned_data
-    Traceback (most recent call last):
-    ...
-    AttributeError: 'ContactForm' object has no attribute 'cleaned_data'
-
-Outputting forms as HTML
-------------------------
-
-The second task of a ``Form`` object is to render itself as HTML. To do so,
-simply ``print`` it::
-
-    >>> f = ContactForm()
-    >>> print f
-    <tr><th><label for="id_subject">Subject:</label></th><td><input id="id_subject" type="text" name="subject" maxlength="100" /></td></tr>
-    <tr><th><label for="id_message">Message:</label></th><td><input type="text" name="message" id="id_message" /></td></tr>
-    <tr><th><label for="id_sender">Sender:</label></th><td><input type="text" name="sender" id="id_sender" /></td></tr>
-    <tr><th><label for="id_cc_myself">Cc myself:</label></th><td><input type="checkbox" name="cc_myself" id="id_cc_myself" /></td></tr>
-
-If the form is bound to data, the HTML output will include that data
-appropriately. For example, if a field is represented by an
-``<input type="text">``, the data will be in the ``value`` attribute. If a
-field is represented by an ``<input type="checkbox">``, then that HTML will
-include ``checked="checked"`` if appropriate::
-
-    >>> data = {'subject': 'hello',
-    ...         'message': 'Hi there',
-    ...         'sender': 'foo@example.com',
-    ...         'cc_myself': True}
-    >>> f = ContactForm(data)
-    >>> print f
-    <tr><th><label for="id_subject">Subject:</label></th><td><input id="id_subject" type="text" name="subject" maxlength="100" value="hello" /></td></tr>
-    <tr><th><label for="id_message">Message:</label></th><td><input type="text" name="message" id="id_message" value="Hi there" /></td></tr>
-    <tr><th><label for="id_sender">Sender:</label></th><td><input type="text" name="sender" id="id_sender" value="foo@example.com" /></td></tr>
-    <tr><th><label for="id_cc_myself">Cc myself:</label></th><td><input type="checkbox" name="cc_myself" id="id_cc_myself" checked="checked" /></td></tr>
-
-This default output is a two-column HTML table, with a ``<tr>`` for each field.
-Notice the following:
-
-    * For flexibility, the output does *not* include the ``<table>`` and
-      ``</table>`` tags, nor does it include the ``<form>`` and ``</form>``
-      tags or an ``<input type="submit">`` tag. It's your job to do that.
-
-    * Each field type has a default HTML representation. ``CharField`` and
-      ``EmailField`` are represented by an ``<input type="text">``.
-      ``BooleanField`` is represented by an ``<input type="checkbox">``. Note
-      these are merely sensible defaults; you can specify which HTML to use for
-      a given field by using widgets, which we'll explain shortly.
-
-    * The HTML ``name`` for each tag is taken directly from its attribute name
-      in the ``ContactForm`` class.
-
-    * The text label for each field -- e.g. ``'Subject:'``, ``'Message:'`` and
-      ``'Cc myself:'`` is generated from the field name by converting all
-      underscores to spaces and upper-casing the first letter. Again, note
-      these are merely sensible defaults; you can also specify labels manually.
-
-    * Each text label is surrounded in an HTML ``<label>`` tag, which points
-      to the appropriate form field via its ``id``. Its ``id``, in turn, is
-      generated by prepending ``'id_'`` to the field name. The ``id``
-      attributes and ``<label>`` tags are included in the output by default, to
-      follow best practices, but you can change that behavior.
-
-Although ``<table>`` output is the default output style when you ``print`` a
-form, other output styles are available. Each style is available as a method on
-a form object, and each rendering method returns a Unicode object.
-
-``as_p()``
-~~~~~~~~~~
-
-``Form.as_p()`` renders the form as a series of ``<p>`` tags, with each ``<p>``
-containing one field::
-
-    >>> f = ContactForm()
-    >>> f.as_p()
-    u'<p><label for="id_subject">Subject:</label> <input id="id_subject" type="text" name="subject" maxlength="100" /></p>\n<p><label for="id_message">Message:</label> <input type="text" name="message" id="id_message" /></p>\n<p><label for="id_sender">Sender:</label> <input type="text" name="sender" id="id_sender" /></p>\n<p><label for="id_cc_myself">Cc myself:</label> <input type="checkbox" name="cc_myself" id="id_cc_myself" /></p>'
-    >>> print f.as_p()
-    <p><label for="id_subject">Subject:</label> <input id="id_subject" type="text" name="subject" maxlength="100" /></p>
-    <p><label for="id_message">Message:</label> <input type="text" name="message" id="id_message" /></p>
-    <p><label for="id_sender">Sender:</label> <input type="text" name="sender" id="id_sender" /></p>
-    <p><label for="id_cc_myself">Cc myself:</label> <input type="checkbox" name="cc_myself" id="id_cc_myself" /></p>
-
-``as_ul()``
-~~~~~~~~~~~
-
-``Form.as_ul()`` renders the form as a series of ``<li>`` tags, with each
-``<li>`` containing one field. It does *not* include the ``<ul>`` or ``</ul>``,
-so that you can specify any HTML attributes on the ``<ul>`` for flexibility::
-
-    >>> f = ContactForm()
-    >>> f.as_ul()
-    u'<li><label for="id_subject">Subject:</label> <input id="id_subject" type="text" name="subject" maxlength="100" /></li>\n<li><label for="id_message">Message:</label> <input type="text" name="message" id="id_message" /></li>\n<li><label for="id_sender">Sender:</label> <input type="text" name="sender" id="id_sender" /></li>\n<li><label for="id_cc_myself">Cc myself:</label> <input type="checkbox" name="cc_myself" id="id_cc_myself" /></li>'
-    >>> print f.as_ul()
-    <li><label for="id_subject">Subject:</label> <input id="id_subject" type="text" name="subject" maxlength="100" /></li>
-    <li><label for="id_message">Message:</label> <input type="text" name="message" id="id_message" /></li>
-    <li><label for="id_sender">Sender:</label> <input type="text" name="sender" id="id_sender" /></li>
-    <li><label for="id_cc_myself">Cc myself:</label> <input type="checkbox" name="cc_myself" id="id_cc_myself" /></li>
-
-``as_table()``
-~~~~~~~~~~~~~~
-
-Finally, ``Form.as_table()`` outputs the form as an HTML ``<table>``. This is
-exactly the same as ``print``. In fact, when you ``print`` a form object, it
-calls its ``as_table()`` method behind the scenes::
-
-    >>> f = ContactForm()
-    >>> f.as_table()
-    u'<tr><th><label for="id_subject">Subject:</label></th><td><input id="id_subject" type="text" name="subject" maxlength="100" /></td></tr>\n<tr><th><label for="id_message">Message:</label></th><td><input type="text" name="message" id="id_message" /></td></tr>\n<tr><th><label for="id_sender">Sender:</label></th><td><input type="text" name="sender" id="id_sender" /></td></tr>\n<tr><th><label for="id_cc_myself">Cc myself:</label></th><td><input type="checkbox" name="cc_myself" id="id_cc_myself" /></td></tr>'
-    >>> print f.as_table()
-    <tr><th><label for="id_subject">Subject:</label></th><td><input id="id_subject" type="text" name="subject" maxlength="100" /></td></tr>
-    <tr><th><label for="id_message">Message:</label></th><td><input type="text" name="message" id="id_message" /></td></tr>
-    <tr><th><label for="id_sender">Sender:</label></th><td><input type="text" name="sender" id="id_sender" /></td></tr>
-    <tr><th><label for="id_cc_myself">Cc myself:</label></th><td><input type="checkbox" name="cc_myself" id="id_cc_myself" /></td></tr>
-
-Configuring HTML ``<label>`` tags
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
-An HTML ``<label>`` tag designates which label text is associated with which
-form element. This small enhancement makes forms more usable and more accessible
-to assistive devices. It's always a good idea to use ``<label>`` tags.
-
-By default, the form rendering methods include HTML ``id`` attributes on the
-form elements and corresponding ``<label>`` tags around the labels. The ``id``
-attribute values are generated by prepending ``id_`` to the form field names.
-This behavior is configurable, though, if you want to change the ``id``
-convention or remove HTML ``id`` attributes and ``<label>`` tags entirely.
-
-Use the ``auto_id`` argument to the ``Form`` constructor to control the label
-and ``id`` behavior. This argument must be ``True``, ``False`` or a string.
-
-If ``auto_id`` is ``False``, then the form output will not include ``<label>``
-tags nor ``id`` attributes::
-
-    >>> f = ContactForm(auto_id=False)
-    >>> print f.as_table()
-    <tr><th>Subject:</th><td><input type="text" name="subject" maxlength="100" /></td></tr>
-    <tr><th>Message:</th><td><input type="text" name="message" /></td></tr>
-    <tr><th>Sender:</th><td><input type="text" name="sender" /></td></tr>
-    <tr><th>Cc myself:</th><td><input type="checkbox" name="cc_myself" /></td></tr>
-    >>> print f.as_ul()
-    <li>Subject: <input type="text" name="subject" maxlength="100" /></li>
-    <li>Message: <input type="text" name="message" /></li>
-    <li>Sender: <input type="text" name="sender" /></li>
-    <li>Cc myself: <input type="checkbox" name="cc_myself" /></li>
-    >>> print f.as_p()
-    <p>Subject: <input type="text" name="subject" maxlength="100" /></p>
-    <p>Message: <input type="text" name="message" /></p>
-    <p>Sender: <input type="text" name="sender" /></p>
-    <p>Cc myself: <input type="checkbox" name="cc_myself" /></p>
-
-If ``auto_id`` is set to ``True``, then the form output *will* include
-``<label>`` tags and will simply use the field name as its ``id`` for each form
-field::
-
-    >>> f = ContactForm(auto_id=True)
-    >>> print f.as_table()
-    <tr><th><label for="subject">Subject:</label></th><td><input id="subject" type="text" name="subject" maxlength="100" /></td></tr>
-    <tr><th><label for="message">Message:</label></th><td><input type="text" name="message" id="message" /></td></tr>
-    <tr><th><label for="sender">Sender:</label></th><td><input type="text" name="sender" id="sender" /></td></tr>
-    <tr><th><label for="cc_myself">Cc myself:</label></th><td><input type="checkbox" name="cc_myself" id="cc_myself" /></td></tr>
-    >>> print f.as_ul()
-    <li><label for="subject">Subject:</label> <input id="subject" type="text" name="subject" maxlength="100" /></li>
-    <li><label for="message">Message:</label> <input type="text" name="message" id="message" /></li>
-    <li><label for="sender">Sender:</label> <input type="text" name="sender" id="sender" /></li>
-    <li><label for="cc_myself">Cc myself:</label> <input type="checkbox" name="cc_myself" id="cc_myself" /></li>
-    >>> print f.as_p()
-    <p><label for="subject">Subject:</label> <input id="subject" type="text" name="subject" maxlength="100" /></p>
-    <p><label for="message">Message:</label> <input type="text" name="message" id="message" /></p>
-    <p><label for="sender">Sender:</label> <input type="text" name="sender" id="sender" /></p>
-    <p><label for="cc_myself">Cc myself:</label> <input type="checkbox" name="cc_myself" id="cc_myself" /></p>
-
-If ``auto_id`` is set to a string containing the format character ``'%s'``,
-then the form output will include ``<label>`` tags, and will generate ``id``
-attributes based on the format string. For example, for a format string
-``'field_%s'``, a field named ``subject`` will get the ``id`` value
-``'field_subject'``. Continuing our example::
-
-    >>> f = ContactForm(auto_id='id_for_%s')
-    >>> print f.as_table()
-    <tr><th><label for="id_for_subject">Subject:</label></th><td><input id="id_for_subject" type="text" name="subject" maxlength="100" /></td></tr>
-    <tr><th><label for="id_for_message">Message:</label></th><td><input type="text" name="message" id="id_for_message" /></td></tr>
-    <tr><th><label for="id_for_sender">Sender:</label></th><td><input type="text" name="sender" id="id_for_sender" /></td></tr>
-    <tr><th><label for="id_for_cc_myself">Cc myself:</label></th><td><input type="checkbox" name="cc_myself" id="id_for_cc_myself" /></td></tr>
-    >>> print f.as_ul()
-    <li><label for="id_for_subject">Subject:</label> <input id="id_for_subject" type="text" name="subject" maxlength="100" /></li>
-    <li><label for="id_for_message">Message:</label> <input type="text" name="message" id="id_for_message" /></li>
-    <li><label for="id_for_sender">Sender:</label> <input type="text" name="sender" id="id_for_sender" /></li>
-    <li><label for="id_for_cc_myself">Cc myself:</label> <input type="checkbox" name="cc_myself" id="id_for_cc_myself" /></li>
-    >>> print f.as_p()
-    <p><label for="id_for_subject">Subject:</label> <input id="id_for_subject" type="text" name="subject" maxlength="100" /></p>
-    <p><label for="id_for_message">Message:</label> <input type="text" name="message" id="id_for_message" /></p>
-    <p><label for="id_for_sender">Sender:</label> <input type="text" name="sender" id="id_for_sender" /></p>
-    <p><label for="id_for_cc_myself">Cc myself:</label> <input type="checkbox" name="cc_myself" id="id_for_cc_myself" /></p>
-
-If ``auto_id`` is set to any other true value -- such as a string that doesn't
-include ``%s`` -- then the library will act as if ``auto_id`` is ``True``.
-
-By default, ``auto_id`` is set to the string ``'id_%s'``.
-
-Normally, a colon (``:``) will be appended after any label name when a form is
-rendered. It's possible to change the colon to another character, or omit it
-entirely, using the ``label_suffix`` parameter::
-
-    >>> f = ContactForm(auto_id='id_for_%s', label_suffix='')
-    >>> print f.as_ul()
-    <li><label for="id_for_subject">Subject</label> <input id="id_for_subject" type="text" name="subject" maxlength="100" /></li>
-    <li><label for="id_for_message">Message</label> <input type="text" name="message" id="id_for_message" /></li>
-    <li><label for="id_for_sender">Sender</label> <input type="text" name="sender" id="id_for_sender" /></li>
-    <li><label for="id_for_cc_myself">Cc myself</label> <input type="checkbox" name="cc_myself" id="id_for_cc_myself" /></li>
-    >>> f = ContactForm(auto_id='id_for_%s', label_suffix=' ->')
-    >>> print f.as_ul()
-    <li><label for="id_for_subject">Subject -></label> <input id="id_for_subject" type="text" name="subject" maxlength="100" /></li>
-    <li><label for="id_for_message">Message -></label> <input type="text" name="message" id="id_for_message" /></li>
-    <li><label for="id_for_sender">Sender -></label> <input type="text" name="sender" id="id_for_sender" /></li>
-    <li><label for="id_for_cc_myself">Cc myself -></label> <input type="checkbox" name="cc_myself" id="id_for_cc_myself" /></li>
-
-Note that the label suffix is added only if the last character of the
-label isn't a punctuation character (``.``, ``!``, ``?`` or ``:``)
-
-Notes on field ordering
-~~~~~~~~~~~~~~~~~~~~~~~
-
-In the ``as_p()``, ``as_ul()`` and ``as_table()`` shortcuts, the fields are
-displayed in the order in which you define them in your form class. For
-example, in the ``ContactForm`` example, the fields are defined in the order
-``subject``, ``message``, ``sender``, ``cc_myself``. To reorder the HTML
-output, just change the order in which those fields are listed in the class.
-
-How errors are displayed
-~~~~~~~~~~~~~~~~~~~~~~~~
-
-If you render a bound ``Form`` object, the act of rendering will automatically
-run the form's validation if it hasn't already happened, and the HTML output
-will include the validation errors as a ``<ul class="errorlist">`` near the
-field. The particular positioning of the error messages depends on the output
-method you're using::
-
-    >>> data = {'subject': '',
-    ...         'message': 'Hi there',
-    ...         'sender': 'invalid e-mail address',
-    ...         'cc_myself': True}
-    >>> f = ContactForm(data, auto_id=False)
-    >>> print f.as_table()
-    <tr><th>Subject:</th><td><ul class="errorlist"><li>This field is required.</li></ul><input type="text" name="subject" maxlength="100" /></td></tr>
-    <tr><th>Message:</th><td><input type="text" name="message" value="Hi there" /></td></tr>
-    <tr><th>Sender:</th><td><ul class="errorlist"><li>Enter a valid e-mail address.</li></ul><input type="text" name="sender" value="invalid e-mail address" /></td></tr>
-    <tr><th>Cc myself:</th><td><input checked="checked" type="checkbox" name="cc_myself" /></td></tr>
-    >>> print f.as_ul()
-    <li><ul class="errorlist"><li>This field is required.</li></ul>Subject: <input type="text" name="subject" maxlength="100" /></li>
-    <li>Message: <input type="text" name="message" value="Hi there" /></li>
-    <li><ul class="errorlist"><li>Enter a valid e-mail address.</li></ul>Sender: <input type="text" name="sender" value="invalid e-mail address" /></li>
-    <li>Cc myself: <input checked="checked" type="checkbox" name="cc_myself" /></li>
-    >>> print f.as_p()
-    <p><ul class="errorlist"><li>This field is required.</li></ul></p>
-    <p>Subject: <input type="text" name="subject" maxlength="100" /></p>
-    <p>Message: <input type="text" name="message" value="Hi there" /></p>
-    <p><ul class="errorlist"><li>Enter a valid e-mail address.</li></ul></p>
-    <p>Sender: <input type="text" name="sender" value="invalid e-mail address" /></p>
-    <p>Cc myself: <input checked="checked" type="checkbox" name="cc_myself" /></p>
-
-Customizing the error list format
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
-By default, forms use ``django.newforms.util.ErrorList`` to format validation
-errors. If you'd like to use an alternate class for displaying errors, you can
-pass that in at construction time::
-
-    >>> from django.newforms.util import ErrorList
-    >>> class DivErrorList(ErrorList):
-    ...     def __unicode__(self):
-    ...         return self.as_divs()
-    ...     def as_divs(self):
-    ...         if not self: return u''
-    ...         return u'<div class="errorlist">%s</div>' % ''.join([u'<div class="error">%s</div>' % e for e in self])
-    >>> f = ContactForm(data, auto_id=False, error_class=DivErrorList)
-    >>> f.as_p()
-    <div class="errorlist"><div class="error">This field is required.</div></div>
-    <p>Subject: <input type="text" name="subject" maxlength="100" /></p>
-    <p>Message: <input type="text" name="message" value="Hi there" /></p>
-    <div class="errorlist"><div class="error">Enter a valid e-mail address.</div></div>
-    <p>Sender: <input type="text" name="sender" value="invalid e-mail address" /></p>
-    <p>Cc myself: <input checked="checked" type="checkbox" name="cc_myself" /></p>
-
-More granular output
-~~~~~~~~~~~~~~~~~~~~
-
-The ``as_p()``, ``as_ul()`` and ``as_table()`` methods are simply shortcuts for
-lazy developers -- they're not the only way a form object can be displayed.
-
-To display the HTML for a single field in your form, use dictionary lookup
-syntax using the field's name as the key, and print the resulting object::
-
-    >>> f = ContactForm()
-    >>> print f['subject']
-    <input id="id_subject" type="text" name="subject" maxlength="100" />
-    >>> print f['message']
-    <input type="text" name="message" id="id_message" />
-    >>> print f['sender']
-    <input type="text" name="sender" id="id_sender" />
-    >>> print f['cc_myself']
-    <input type="checkbox" name="cc_myself" id="id_cc_myself" />
-
-Call ``str()`` or ``unicode()`` on the field to get its rendered HTML as a
-string or Unicode object, respectively::
-
-    >>> str(f['subject'])
-    '<input id="id_subject" type="text" name="subject" maxlength="100" />'
-    >>> unicode(f['subject'])
-    u'<input id="id_subject" type="text" name="subject" maxlength="100" />'
-
-The field-specific output honors the form object's ``auto_id`` setting::
-
-    >>> f = ContactForm(auto_id=False)
-    >>> print f['message']
-    <input type="text" name="message" />
-    >>> f = ContactForm(auto_id='id_%s')
-    >>> print f['message']
-    <input type="text" name="message" id="id_message" />
-
-For a field's list of errors, access the field's ``errors`` attribute. This
-is a list-like object that is displayed as an HTML ``<ul class="errorlist">``
-when printed::
-
-    >>> data = {'subject': 'hi', 'message': '', 'sender': '', 'cc_myself': ''}
-    >>> f = ContactForm(data, auto_id=False)
-    >>> print f['message']
-    <input type="text" name="message" />
-    >>> f['message'].errors
-    [u'This field is required.']
-    >>> print f['message'].errors
-    <ul class="errorlist"><li>This field is required.</li></ul>
-    >>> f['subject'].errors
-    []
-    >>> print f['subject'].errors
-
-    >>> str(f['subject'].errors)
-    ''
-
-Using forms in views and templates
-----------------------------------
-
-Let's put this all together and use the ``ContactForm`` example in a Django
-view and template.
-
-Simple view example
-~~~~~~~~~~~~~~~~~~~
-
-This example view displays the contact form by default and validates/processes
-it if accessed via a POST request::
-
-    def contact(request):
-        if request.method == 'POST':
-            form = ContactForm(request.POST)
-            if form.is_valid():
-                # Do form processing here...
-                return HttpResponseRedirect('/url/on_success/')
-        else:
-            form = ContactForm()
-        return render_to_response('contact.html', {'form': form})
-
-Simple template example
-~~~~~~~~~~~~~~~~~~~~~~~
-
-The template in the above view example, ``contact.html``, is responsible for
-displaying the form as HTML. To do this, we can use the techniques outlined in
-the "Outputting forms as HTML" section above.
-
-The simplest way to display a form's HTML is to use the variable on its own,
-like this::
-
-    <form method="post" action="">
-    <table>{{ form }}</table>
-    <input type="submit" />
-    </form>
-
-The above template code will display the form as an HTML table, using the
-``form.as_table()`` method explained previously. This works because Django's
-template system displays an object's ``__str__()`` value, and the ``Form``
-class' ``__str__()`` method calls its ``as_table()`` method.
-
-The following is equivalent but a bit more explicit::
-
-    <form method="post" action="">
-    <table>{{ form.as_table }}</table>
-    <input type="submit" />
-    </form>
-
-``form.as_ul`` and ``form.as_p`` are also available, as you may expect.
-
-Note that in the above two examples, we included the ``<form>``, ``<table>``
-``<input type="submit" />``, ``</table>`` and ``</form>`` tags. The form
-convenience methods (``as_table()``, ``as_ul()`` and ``as_p()``) do not include
-that HTML.
-
-Complex template output
-~~~~~~~~~~~~~~~~~~~~~~~
-
-As we've stressed several times, the ``as_table()``, ``as_ul()`` and ``as_p()``
-methods are just shortcuts for the common case. You can also work with the
-individual fields for complete template control over the form's design.
-
-The easiest way is to iterate over the form's fields, with
-``{% for field in form %}``. For example::
-
-    <form method="post" action="">
-    <dl>
-    {% for field in form %}
-        <dt>{{ field.label_tag }}</dt>
-        <dd>{{ field }}</dd>
-        {% if field.help_text %}<dd>{{ field.help_text }}</dd>{% endif %}
-        {% if field.errors %}<dd class="myerrors">{{ field.errors }}</dd>{% endif %}
-    {% endfor %}
-    </dl>
-    <input type="submit" />
-    </form>
-
-This iteration technique is useful if you want to apply the same HTML
-formatting to each field, or if you don't know the names of the form fields
-ahead of time. Note that the fields will be iterated over in the order in which
-they're defined in the ``Form`` class.
-
-Alternatively, you can arrange the form's fields explicitly, by name. Do that
-by accessing ``{{ form.fieldname }}``, where ``fieldname`` is the field's name.
-For example::
-
-    <form method="post" action="">
-    <ul class="myformclass">
-        <li>{{ form.sender.label_tag }} {{ form.sender }}</li>
-        <li class="helptext">{{ form.sender.help_text }}</li>
-        {% if form.sender.errors %}<ul class="errorlist">{{ form.sender.errors }}</ul>{% endif %}
-
-        <li>{{ form.subject.label_tag }} {{ form.subject }}</li>
-        <li class="helptext">{{ form.subject.help_text }}</li>
-        {% if form.subject.errors %}<ul class="errorlist">{{ form.subject.errors }}</ul>{% endif %}
-
-        ...
-    </ul>
-    </form>
-
-Highlighting required fields in templates
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
-It's common to show a user which fields are required. Here's an example of how
-to do that, using the above example modified to insert an asterisk after the
-label of each required field::
-
-    <form method="post" action="">
-    <dl>
-    {% for field in form %}
-        <dt>{{ field.label_tag }}{% if field.field.required %}*{% endif %}</dt>
-        <dd>{{ field }}</dd>
-        {% if field.help_text %}<dd>{{ field.help_text }}</dd>{% endif %}
-        {% if field.errors %}<dd class="myerrors">{{ field.errors }}</dd>{% endif %}
-    {% endfor %}
-    </dl>
-    <input type="submit" />
-    </form>
-
-The ``{% if field.field.required %}*{% endif %}`` fragment is the relevant
-addition here. It adds the asterisk only if the field is required.
-
-Note that we check ``field.field.required`` and not ``field.required``. In the
-template, ``field`` is a ``newforms.forms.BoundField`` instance, which holds
-the actual ``Field`` instance in its ``field`` attribute.
-
-Binding uploaded files to a form
---------------------------------
-
-**New in Django development version**
-
-Dealing with forms that have ``FileField`` and ``ImageField`` fields
-is a little more complicated than a normal form.
-
-Firstly, in order to upload files, you'll need to make sure that your
-``<form>`` element correctly defines the ``enctype`` as
-``"multipart/form-data"``::
-
-  <form enctype="multipart/form-data" method="post" action="/foo/">
-
-Secondly, when you use the form, you need to bind the file data. File
-data is handled separately to normal form data, so when your form
-contains a ``FileField`` and ``ImageField``, you will need to specify
-a second argument when you bind your form. So if we extend our
-ContactForm to include an ``ImageField`` called ``mugshot``, we
-need to bind the file data containing the mugshot image::
-
-    # Bound form with an image field
-    >>> from django.core.files.uploadedfile import SimpleUploadedFile
-    >>> data = {'subject': 'hello',
-    ...         'message': 'Hi there',
-    ...         'sender': 'foo@example.com',
-    ...         'cc_myself': True}
-    >>> file_data = {'mugshot': SimpleUploadedFile('face.jpg', <file data>)}
-    >>> f = ContactFormWithMugshot(data, file_data)
-
-In practice, you will usually specify ``request.FILES`` as the source
-of file data (just like you use ``request.POST`` as the source of
-form data)::
-
-    # Bound form with an image field, data from the request
-    >>> f = ContactFormWithMugshot(request.POST, request.FILES)
-
-Constructing an unbound form is the same as always -- just omit both
-form data *and* file data::
-
-    # Unbound form with a image field
-    >>> f = ContactFormWithMugshot()
-
-Testing for multipart forms
-~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
-If you're writing reusable views or templates, you may not know ahead of time
-whether your form is a multipart form or not. The ``is_multipart()`` method
-tells you whether the form requires multipart encoding for submission::
-
-    >>> f = ContactFormWithMugshot()
-    >>> f.is_multipart()
-    True
-
-Here's an example of how you might use this in a template::
-
-    {% if form.is_multipart %}
-        <form enctype="multipart/form-data" method="post" action="/foo/">
-    {% else %}
-        <form method="post" action="/foo/">
-    {% endif %}
-    {% form %}
-    </form>
-
-Subclassing forms
------------------
-
-If you have multiple ``Form`` classes that share fields, you can use
-subclassing to remove redundancy.
-
-When you subclass a custom ``Form`` class, the resulting subclass will
-include all fields of the parent class(es), followed by the fields you define
-in the subclass.
-
-In this example, ``ContactFormWithPriority`` contains all the fields from
-``ContactForm``, plus an additional field, ``priority``. The ``ContactForm``
-fields are ordered first::
-
-    >>> class ContactFormWithPriority(ContactForm):
-    ...     priority = forms.CharField()
-    >>> f = ContactFormWithPriority(auto_id=False)
-    >>> print f.as_ul()
-    <li>Subject: <input type="text" name="subject" maxlength="100" /></li>
-    <li>Message: <input type="text" name="message" /></li>
-    <li>Sender: <input type="text" name="sender" /></li>
-    <li>Cc myself: <input type="checkbox" name="cc_myself" /></li>
-    <li>Priority: <input type="text" name="priority" /></li>
-
-It's possible to subclass multiple forms, treating forms as "mix-ins." In this
-example, ``BeatleForm`` subclasses both ``PersonForm`` and ``InstrumentForm``
-(in that order), and its field list includes the fields from the parent
-classes::
-
-    >>> class PersonForm(Form):
-    ...     first_name = CharField()
-    ...     last_name = CharField()
-    >>> class InstrumentForm(Form):
-    ...     instrument = CharField()
-    >>> class BeatleForm(PersonForm, InstrumentForm):
-    ...     haircut_type = CharField()
-    >>> b = BeatleForm(auto_id=False)
-    >>> print b.as_ul()
-    <li>First name: <input type="text" name="first_name" /></li>
-    <li>Last name: <input type="text" name="last_name" /></li>
-    <li>Instrument: <input type="text" name="instrument" /></li>
-    <li>Haircut type: <input type="text" name="haircut_type" /></li>
-
-Prefixes for forms
-------------------
-
-You can put several Django forms inside one ``<form>`` tag. To give each
-``Form`` its own namespace, use the ``prefix`` keyword argument::
-
-    >>> mother = PersonForm(prefix="mother")
-    >>> father = PersonForm(prefix="father")
-    >>> print mother.as_ul()
-    <li><label for="id_mother-first_name">First name:</label> <input type="text" name="mother-first_name" id="id_mother-first_name" /></li>
-    <li><label for="id_mother-last_name">Last name:</label> <input type="text" name="mother-last_name" id="id_mother-last_name" /></li>
-    >>> print father.as_ul()
-    <li><label for="id_father-first_name">First name:</label> <input type="text" name="father-first_name" id="id_father-first_name" /></li>
-    <li><label for="id_father-last_name">Last name:</label> <input type="text" name="father-last_name" id="id_father-last_name" /></li>
-
-Fields
-======
-
-When you create a ``Form`` class, the most important part is defining the
-fields of the form. Each field has custom validation logic, along with a few
-other hooks.
-
-Although the primary way you'll use ``Field`` classes is in ``Form`` classes,
-you can also instantiate them and use them directly to get a better idea of
-how they work. Each ``Field`` instance has a ``clean()`` method, which takes
-a single argument and either raises a ``django.newforms.ValidationError``
-exception or returns the clean value::
-
-    >>> f = forms.EmailField()
-    >>> f.clean('foo@example.com')
-    u'foo@example.com'
-    >>> f.clean(u'foo@example.com')
-    u'foo@example.com'
-    >>> f.clean('invalid e-mail address')
-    Traceback (most recent call last):
-    ...
-    ValidationError: [u'Enter a valid e-mail address.']
-
-If you've used Django's old forms/validation framework, take care in noticing
-this ``ValidationError`` is different than the previous ``ValidationError``.
-This one lives at ``django.newforms.ValidationError`` rather than
-``django.core.validators.ValidationError``.
-
-Core field arguments
---------------------
-
-Each ``Field`` class constructor takes at least these arguments. Some
-``Field`` classes take additional, field-specific arguments, but the following
-should *always* be accepted:
-
-``required``
-~~~~~~~~~~~~
-
-By default, each ``Field`` class assumes the value is required, so if you pass
-an empty value -- either ``None`` or the empty string (``""``) -- then
-``clean()`` will raise a ``ValidationError`` exception::
-
-    >>> f = forms.CharField()
-    >>> f.clean('foo')
-    u'foo'
-    >>> f.clean('')
-    Traceback (most recent call last):
-    ...
-    ValidationError: [u'This field is required.']
-    >>> f.clean(None)
-    Traceback (most recent call last):
-    ...
-    ValidationError: [u'This field is required.']
-    >>> f.clean(' ')
-    u' '
-    >>> f.clean(0)
-    u'0'
-    >>> f.clean(True)
-    u'True'
-    >>> f.clean(False)
-    u'False'
-
-To specify that a field is *not* required, pass ``required=False`` to the
-``Field`` constructor::
-
-    >>> f = forms.CharField(required=False)
-    >>> f.clean('foo')
-    u'foo'
-    >>> f.clean('')
-    u''
-    >>> f.clean(None)
-    u''
-    >>> f.clean(0)
-    u'0'
-    >>> f.clean(True)
-    u'True'
-    >>> f.clean(False)
-    u'False'
-
-If a ``Field`` has ``required=False`` and you pass ``clean()`` an empty value,
-then ``clean()`` will return a *normalized* empty value rather than raising
-``ValidationError``. For ``CharField``, this will be a Unicode empty string.
-For other ``Field`` classes, it might be ``None``. (This varies from field to
-field.)
-
-``label``
-~~~~~~~~~
-
-The ``label`` argument lets you specify the "human-friendly" label for this
-field. This is used when the ``Field`` is displayed in a ``Form``.
-
-As explained in "Outputting forms as HTML" above, the default label for a
-``Field`` is generated from the field name by converting all underscores to
-spaces and upper-casing the first letter. Specify ``label`` if that default
-behavior doesn't result in an adequate label.
-
-Here's a full example ``Form`` that implements ``label`` for two of its fields.
-We've specified ``auto_id=False`` to simplify the output::
-
-    >>> class CommentForm(forms.Form):
-    ...     name = forms.CharField(label='Your name')
-    ...     url = forms.URLField(label='Your Web site', required=False)
-    ...     comment = forms.CharField()
-    >>> f = CommentForm(auto_id=False)
-    >>> print f
-    <tr><th>Your name:</th><td><input type="text" name="name" /></td></tr>
-    <tr><th>Your Web site:</th><td><input type="text" name="url" /></td></tr>
-    <tr><th>Comment:</th><td><input type="text" name="comment" /></td></tr>
-
-``initial``
-~~~~~~~~~~~
-
-The ``initial`` argument lets you specify the initial value to use when
-rendering this ``Field`` in an unbound ``Form``.
-
-The use-case for this is when you want to display an "empty" form in which a
-field is initialized to a particular value. For example::
-
-    >>> class CommentForm(forms.Form):
-    ...     name = forms.CharField(initial='Your name')
-    ...     url = forms.URLField(initial='http://')
-    ...     comment = forms.CharField()
-    >>> f = CommentForm(auto_id=False)
-    >>> print f
-    <tr><th>Name:</th><td><input type="text" name="name" value="Your name" /></td></tr>
-    <tr><th>Url:</th><td><input type="text" name="url" value="http://" /></td></tr>
-    <tr><th>Comment:</th><td><input type="text" name="comment" /></td></tr>
-
-You may be thinking, why not just pass a dictionary of the initial values as
-data when displaying the form? Well, if you do that, you'll trigger validation,
-and the HTML output will include any validation errors::
-
-    >>> class CommentForm(forms.Form):
-    ...     name = forms.CharField()
-    ...     url = forms.URLField()
-    ...     comment = forms.CharField()
-    >>> default_data = {'name': 'Your name', 'url': 'http://'}
-    >>> f = CommentForm(default_data, auto_id=False)
-    >>> print f
-    <tr><th>Name:</th><td><input type="text" name="name" value="Your name" /></td></tr>
-    <tr><th>Url:</th><td><ul class="errorlist"><li>Enter a valid URL.</li></ul><input type="text" name="url" value="http://" /></td></tr>
-    <tr><th>Comment:</th><td><ul class="errorlist"><li>This field is required.</li></ul><input type="text" name="comment" /></td></tr>
-
-This is why ``initial`` values are only displayed for unbound forms. For bound
-forms, the HTML output will use the bound data.
-
-Also note that ``initial`` values are *not* used as "fallback" data in
-validation if a particular field's value is not given. ``initial`` values are
-*only* intended for initial form display::
-
-    >>> class CommentForm(forms.Form):
-    ...     name = forms.CharField(initial='Your name')
-    ...     url = forms.URLField(initial='http://')
-    ...     comment = forms.CharField()
-    >>> data = {'name': '', 'url': '', 'comment': 'Foo'}
-    >>> f = CommentForm(data)
-    >>> f.is_valid()
-    False
-    # The form does *not* fall back to using the initial values.
-    >>> f.errors
-    {'url': [u'This field is required.'], 'name': [u'This field is required.']}
-
-``widget``
-~~~~~~~~~~
-
-The ``widget`` argument lets you specify a ``Widget`` class to use when
-rendering this ``Field``. See `Widgets`_ below for more information.
-
-``help_text``
-~~~~~~~~~~~~~
-
-The ``help_text`` argument lets you specify descriptive text for this
-``Field``. If you provide ``help_text``, it will be displayed next to the
-``Field`` when the ``Field`` is rendered by one of the convenience ``Form``
-methods (e.g., ``as_ul()``).
-
-Here's a full example ``Form`` that implements ``help_text`` for two of its
-fields. We've specified ``auto_id=False`` to simplify the output::
-
-    >>> class HelpTextContactForm(forms.Form):
-    ...     subject = forms.CharField(max_length=100, help_text='100 characters max.')
-    ...     message = forms.CharField()
-    ...     sender = forms.EmailField(help_text='A valid e-mail address, please.')
-    ...     cc_myself = forms.BooleanField(required=False)
-    >>> f = HelpTextContactForm(auto_id=False)
-    >>> print f.as_table()
-    <tr><th>Subject:</th><td><input type="text" name="subject" maxlength="100" /><br />100 characters max.</td></tr>
-    <tr><th>Message:</th><td><input type="text" name="message" /></td></tr>
-    <tr><th>Sender:</th><td><input type="text" name="sender" /><br />A valid e-mail address, please.</td></tr>
-    <tr><th>Cc myself:</th><td><input type="checkbox" name="cc_myself" /></td></tr>
-    >>> print f.as_ul()
-    <li>Subject: <input type="text" name="subject" maxlength="100" /> 100 characters max.</li>
-    <li>Message: <input type="text" name="message" /></li>
-    <li>Sender: <input type="text" name="sender" /> A valid e-mail address, please.</li>
-    <li>Cc myself: <input type="checkbox" name="cc_myself" /></li>
-    >>> print f.as_p()
-    <p>Subject: <input type="text" name="subject" maxlength="100" /> 100 characters max.</p>
-    <p>Message: <input type="text" name="message" /></p>
-    <p>Sender: <input type="text" name="sender" /> A valid e-mail address, please.</p>
-    <p>Cc myself: <input type="checkbox" name="cc_myself" /></p>
-
-``error_messages``
-~~~~~~~~~~~~~~~~~~
-
-**New in Django development version**
-
-The ``error_messages`` argument lets you override the default messages that the
-field will raise. Pass in a dictionary with keys matching the error messages you
-want to override. For example, here is the default error message::
-
-    >>> generic = forms.CharField()
-    >>> generic.clean('')
-    Traceback (most recent call last):
-      ...
-    ValidationError: [u'This field is required.']
-
-And here is a custom error message::
-
-    >>> name = forms.CharField(error_messages={'required': 'Please enter your name'})
-    >>> name.clean('')
-    Traceback (most recent call last):
-      ...
-    ValidationError: [u'Please enter your name']
-
-In the `built-in Field classes`_ section below, each ``Field`` defines the
-error message keys it uses.
-
-Dynamic initial values
-----------------------
-
-The ``initial`` argument to ``Field`` (explained above) lets you hard-code the
-initial value for a ``Field`` -- but what if you want to declare the initial
-value at runtime? For example, you might want to fill in a ``username`` field
-with the username of the current session.
-
-To accomplish this, use the ``initial`` argument to a ``Form``. This argument,
-if given, should be a dictionary mapping field names to initial values. Only
-include the fields for which you're specifying an initial value; it's not
-necessary to include every field in your form. For example::
-
-    >>> class CommentForm(forms.Form):
-    ...     name = forms.CharField()
-    ...     url = forms.URLField()
-    ...     comment = forms.CharField()
-    >>> f = CommentForm(initial={'name': 'your username'}, auto_id=False)
-    >>> print f
-    <tr><th>Name:</th><td><input type="text" name="name" value="your username" /></td></tr>
-    <tr><th>Url:</th><td><input type="text" name="url" /></td></tr>
-    <tr><th>Comment:</th><td><input type="text" name="comment" /></td></tr>
-    >>> f = CommentForm(initial={'name': 'another username'}, auto_id=False)
-    >>> print f
-    <tr><th>Name:</th><td><input type="text" name="name" value="another username" /></td></tr>
-    <tr><th>Url:</th><td><input type="text" name="url" /></td></tr>
-    <tr><th>Comment:</th><td><input type="text" name="comment" /></td></tr>
-
-Just like the ``initial`` parameter to ``Field``, these values are only
-displayed for unbound forms, and they're not used as fallback values if a
-particular value isn't provided.
-
-Finally, note that if a ``Field`` defines ``initial`` *and* you include
-``initial`` when instantiating the ``Form``, then the latter ``initial`` will
-have precedence. In this example, ``initial`` is provided both at the field
-level and at the form instance level, and the latter gets precedence::
-
-    >>> class CommentForm(forms.Form):
-    ...     name = forms.CharField(initial='class')
-    ...     url = forms.URLField()
-    ...     comment = forms.CharField()
-    >>> f = CommentForm(initial={'name': 'instance'}, auto_id=False)
-    >>> print f
-    <tr><th>Name:</th><td><input type="text" name="name" value="instance" /></td></tr>
-    <tr><th>Url:</th><td><input type="text" name="url" /></td></tr>
-    <tr><th>Comment:</th><td><input type="text" name="comment" /></td></tr>
-
-Built-in ``Field`` classes
---------------------------
-
-Naturally, the ``newforms`` library comes with a set of ``Field`` classes that
-represent common validation needs. This section documents each built-in field.
-
-For each field, we describe the default widget used if you don't specify
-``widget``. We also specify the value returned when you provide an empty value
-(see the section on ``required`` above to understand what that means).
-
-``BooleanField``
-~~~~~~~~~~~~~~~~
-
-    * Default widget: ``CheckboxInput``
-    * Empty value: ``False``
-    * Normalizes to: A Python ``True`` or ``False`` value.
-    * Validates that the check box is checked (i.e. the value is ``True``) if
-      the field has ``required=True``.
-    * Error message keys: ``required``
-
-**New in Django development version:** The empty value for a ``CheckboxInput``
-(and hence the standard ``BooleanField``) has changed to return ``False``
-instead of ``None`` in the development version.
-
-.. note::
-    Since all ``Field`` subclasses have ``required=True`` by default, the
-    validation condition here is important. If you want to include a checkbox
-    in your form that can be either checked or unchecked, you must remember to
-    pass in ``required=False`` when creating the ``BooleanField``.
-
-``CharField``
-~~~~~~~~~~~~~
-
-    * Default widget: ``TextInput``
-    * Empty value: ``''`` (an empty string)
-    * Normalizes to: A Unicode object.
-    * Validates ``max_length`` or ``min_length``, if they are provided.
-      Otherwise, all inputs are valid.
-    * Error message keys: ``required``, ``max_length``, ``min_length``
-
-Has two optional arguments for validation, ``max_length`` and ``min_length``.
-If provided, these arguments ensure that the string is at most or at least the
-given length.
-
-``ChoiceField``
-~~~~~~~~~~~~~~~
-
-    * Default widget: ``Select``
-    * Empty value: ``''`` (an empty string)
-    * Normalizes to: A Unicode object.
-    * Validates that the given value exists in the list of choices.
-    * Error message keys: ``required``, ``invalid_choice``
-
-Takes one extra argument, ``choices``, which is an iterable (e.g., a list or
-tuple) of 2-tuples to use as choices for this field. This argument accepts
-the same formats as the ``choices`` argument to a model field. See the 
-`model API documentation on choices`_ for more details.
-
-.. _model API documentation on choices: ../model-api#choices
-
-``DateField``
-~~~~~~~~~~~~~
-
-    * Default widget: ``TextInput``
-    * Empty value: ``None``
-    * Normalizes to: A Python ``datetime.date`` object.
-    * Validates that the given value is either a ``datetime.date``,
-      ``datetime.datetime`` or string formatted in a particular date format.
-    * Error message keys: ``required``, ``invalid``
-
-Takes one optional argument, ``input_formats``, which is a list of formats used
-to attempt to convert a string to a valid ``datetime.date`` object.
-
-If no ``input_formats`` argument is provided, the default input formats are::
-
-    '%Y-%m-%d', '%m/%d/%Y', '%m/%d/%y', # '2006-10-25', '10/25/2006', '10/25/06'
-    '%b %d %Y', '%b %d, %Y',            # 'Oct 25 2006', 'Oct 25, 2006'
-    '%d %b %Y', '%d %b, %Y',            # '25 Oct 2006', '25 Oct, 2006'
-    '%B %d %Y', '%B %d, %Y',            # 'October 25 2006', 'October 25, 2006'
-    '%d %B %Y', '%d %B, %Y',            # '25 October 2006', '25 October, 2006'
-
-``DateTimeField``
-~~~~~~~~~~~~~~~~~
-
-    * Default widget: ``DateTimeInput``
-    * Empty value: ``None``
-    * Normalizes to: A Python ``datetime.datetime`` object.
-    * Validates that the given value is either a ``datetime.datetime``,
-      ``datetime.date`` or string formatted in a particular datetime format.
-    * Error message keys: ``required``, ``invalid``
-
-Takes one optional argument, ``input_formats``, which is a list of formats used
-to attempt to convert a string to a valid ``datetime.datetime`` object.
-
-If no ``input_formats`` argument is provided, the default input formats are::
-
-    '%Y-%m-%d %H:%M:%S',     # '2006-10-25 14:30:59'
-    '%Y-%m-%d %H:%M',        # '2006-10-25 14:30'
-    '%Y-%m-%d',              # '2006-10-25'
-    '%m/%d/%Y %H:%M:%S',     # '10/25/2006 14:30:59'
-    '%m/%d/%Y %H:%M',        # '10/25/2006 14:30'
-    '%m/%d/%Y',              # '10/25/2006'
-    '%m/%d/%y %H:%M:%S',     # '10/25/06 14:30:59'
-    '%m/%d/%y %H:%M',        # '10/25/06 14:30'
-    '%m/%d/%y',              # '10/25/06'
-
-**New in Django development version:** The ``DateTimeField`` used to use a
-``TextInput`` widget by default. This has now changed.
-
-``DecimalField``
-~~~~~~~~~~~~~~~~
-
-**New in Django development version**
-
-    * Default widget: ``TextInput``
-    * Empty value: ``None``
-    * Normalizes to: A Python ``decimal``.
-    * Validates that the given value is a decimal. Leading and trailing
-      whitespace is ignored.
-    * Error message keys: ``required``, ``invalid``, ``max_value``,
-      ``min_value``, ``max_digits``, ``max_decimal_places``,
-      ``max_whole_digits``
-
-Takes four optional arguments: ``max_value``, ``min_value``, ``max_digits``,
-and ``decimal_places``. The first two define the limits for the fields value.
-``max_digits`` is the maximum number of digits (those before the decimal
-point plus those after the decimal point, with leading zeros stripped)
-permitted in the value, whilst ``decimal_places`` is the maximum number of
-decimal places permitted.
-
-``EmailField``
-~~~~~~~~~~~~~~
-
-    * Default widget: ``TextInput``
-    * Empty value: ``''`` (an empty string)
-    * Normalizes to: A Unicode object.
-    * Validates that the given value is a valid e-mail address, using a
-      moderately complex regular expression.
-    * Error message keys: ``required``, ``invalid``
-
-Has two optional arguments for validation, ``max_length`` and ``min_length``.
-If provided, these arguments ensure that the string is at most or at least the
-given length.
-
-``FileField``
-~~~~~~~~~~~~~
-
-**New in Django development version**
-
-    * Default widget: ``FileInput``
-    * Empty value: ``None``
-    * Normalizes to: An ``UploadedFile`` object that wraps the file content
-      and file name into a single object.
-    * Validates that non-empty file data has been bound to the form.
-    * Error message keys: ``required``, ``invalid``, ``missing``, ``empty``
-
-To learn more about the ``UploadedFile`` object, see the `file uploads documentation`_.
-
-When you use a ``FileField`` in a form, you must also remember to
-`bind the file data to the form`_.
-
-.. _file uploads documentation: ../upload_handling/
-.. _`bind the file data to the form`: `Binding uploaded files to a form`_
-
-``FilePathField``
-~~~~~~~~~~~~~~~~~
-
-**New in Django development version**
-
-    * Default widget: ``Select``
-    * Empty value: ``None``
-    * Normalizes to: A unicode object
-    * Validates that the selected choice exists in the list of choices.
-    * Error message keys: ``required``, ``invalid_choice``
-
-The field allows choosing from files inside a certain directory. It takes three
-extra arguments:
-
-    ==============  ==========  ===============================================
-    Argument        Required?   Description
-    ==============  ==========  ===============================================
-    ``path``        Yes         The absolute path to the directory whose 
-                                contents you want listed. This directory must 
-                                exist.
-                            
-    ``recursive``   No          If ``False`` (the default) only the direct
-                                contents of ``path`` will be offered as choices.
-                                If ``True``, the directory will be descended
-                                into recursively and all descendants will be
-                                listed as choices.
-                                
-    ``match``       No          A regular expression pattern; only files with
-                                names matching this expression will be allowed
-                                as choices.
-    ==============  ==========  ===============================================
-
-``FloatField`` 
-~~~~~~~~~~~~~~ 
-
-    * Default widget: ``TextInput`` 
-    * Empty value: ``None`` 
-    * Normalizes to: A Python float. 
-    * Validates that the given value is an float. Leading and trailing 
-      whitespace is allowed, as in Python's ``float()`` function. 
-    * Error message keys: ``required``, ``invalid``, ``max_value``, 
-      ``min_value`` 
-	 
-Takes two optional arguments for validation, ``max_value`` and ``min_value``. 
-These control the range of values permitted in the field.
-
-``ImageField``
-~~~~~~~~~~~~~~
-
-**New in Django development version**
-
-    * Default widget: ``FileInput``
-    * Empty value: ``None``
-    * Normalizes to: An ``UploadedFile`` object that wraps the file content
-      and file name into a single object.
-    * Validates that file data has been bound to the form, and that the
-      file is of an image format understood by PIL.
-    * Error message keys: ``required``, ``invalid``, ``missing``, ``empty``,
-      ``invalid_image``
-
-Using an ImageField requires that the `Python Imaging Library`_ is installed.
-
-When you use an ``ImageField`` in a form, you must also remember to
-`bind the file data to the form`_.
-
-.. _Python Imaging Library: http://www.pythonware.com/products/pil/
-
-``IntegerField``
-~~~~~~~~~~~~~~~~
-
-    * Default widget: ``TextInput``
-    * Empty value: ``None``
-    * Normalizes to: A Python integer or long integer.
-    * Validates that the given value is an integer. Leading and trailing
-      whitespace is allowed, as in Python's ``int()`` function.
-    * Error message keys: ``required``, ``invalid``, ``max_value``,
-      ``min_value``
-
-Takes two optional arguments for validation, ``max_value`` and ``min_value``.
-These control the range of values permitted in the field.
-
-``IPAddressField``
-~~~~~~~~~~~~~~~~~~
-
-    * Default widget: ``TextInput``
-    * Empty value: ``''`` (an empty string)
-    * Normalizes to: A Unicode object.
-    * Validates that the given value is a valid IPv4 address, using a regular
-      expression.
-    * Error message keys: ``required``, ``invalid``
-
-``MultipleChoiceField``
-~~~~~~~~~~~~~~~~~~~~~~~
-
-    * Default widget: ``SelectMultiple``
-    * Empty value: ``[]`` (an empty list)
-    * Normalizes to: A list of Unicode objects.
-    * Validates that every value in the given list of values exists in the list
-      of choices.
-    * Error message keys: ``required``, ``invalid_choice``, ``invalid_list``
-
-Takes one extra argument, ``choices``, which is an iterable (e.g., a list or
-tuple) of 2-tuples to use as choices for this field. This argument accepts
-the same formats as the ``choices`` argument to a model field. See the 
-`model API documentation on choices`_ for more details.
-
-``NullBooleanField``
-~~~~~~~~~~~~~~~~~~~~
-
-    * Default widget: ``NullBooleanSelect``
-    * Empty value: ``None``
-    * Normalizes to: A Python ``True``, ``False`` or ``None`` value.
-    * Validates nothing (i.e., it never raises a ``ValidationError``).
-
-``RegexField``
-~~~~~~~~~~~~~~
-
-    * Default widget: ``TextInput``
-    * Empty value: ``''`` (an empty string)
-    * Normalizes to: A Unicode object.
-    * Validates that the given value matches against a certain regular
-      expression.
-    * Error message keys: ``required``, ``invalid``
-
-Takes one required argument, ``regex``, which is a regular expression specified
-either as a string or a compiled regular expression object.
-
-Also takes the following optional arguments:
-
-    ======================  =====================================================
-    Argument                Description
-    ======================  =====================================================
-    ``max_length``          Ensures the string has at most this many characters.
-    ``min_length``          Ensures the string has at least this many characters.
-    ======================  =====================================================
-
-The optional argument ``error_message`` is also accepted for backwards
-compatibility. The preferred way to provide an error message is to use the
-``error_messages`` argument, passing a dictionary with ``'invalid'`` as a key
-and the error message as the value.
-
-``TimeField``
-~~~~~~~~~~~~~
-
-    * Default widget: ``TextInput``
-    * Empty value: ``None``
-    * Normalizes to: A Python ``datetime.time`` object.
-    * Validates that the given value is either a ``datetime.time`` or string
-      formatted in a particular time format.
-    * Error message keys: ``required``, ``invalid``
-
-Takes one optional argument, ``input_formats``, which is a list of formats used
-to attempt to convert a string to a valid ``datetime.time`` object.
-
-If no ``input_formats`` argument is provided, the default input formats are::
-
-    '%H:%M:%S',     # '14:30:59'
-    '%H:%M',        # '14:30'
-
-``URLField``
-~~~~~~~~~~~~
-
-    * Default widget: ``TextInput``
-    * Empty value: ``''`` (an empty string)
-    * Normalizes to: A Unicode object.
-    * Validates that the given value is a valid URL.
-    * Error message keys: ``required``, ``invalid``, ``invalid_link``
-
-Takes the following optional arguments:
-
-    ========================  =====================================================
-    Argument                  Description
-    ========================  =====================================================
-    ``max_length``            Ensures the string has at most this many characters.
-    ``min_length``            Ensures the string has at least this many characters.
-    ``verify_exists``         If ``True``, the validator will attempt to load the
-                              given URL, raising ``ValidationError`` if the page
-                              gives a 404. Defaults to ``False``.
-    ``validator_user_agent``  String used as the user-agent used when checking for
-                              a URL's existence. Defaults to the value of the
-                              ``URL_VALIDATOR_USER_AGENT`` setting.
-    ========================  =====================================================
-
-Slightly complex built-in ``Field`` classes
--------------------------------------------
-
-The following are not yet documented here. See the unit tests, linked-to from
-the bottom of this document, for examples of their use.
-
-``ComboField``
-~~~~~~~~~~~~~~
-
-``MultiValueField``
-~~~~~~~~~~~~~~~~~~~
-
-``SplitDateTimeField``
-~~~~~~~~~~~~~~~~~~~~~~
-
-Fields which handle relationships
----------------------------------
-
-For representing relationships between models, two fields are
-provided which can derive their choices from a ``QuerySet``, and which
-place one or more model objects into the ``cleaned_data`` dictionary
-of forms in which they're used. Both of these fields have an
-additional required argument:
-
-``queryset``
-    A ``QuerySet`` of model objects from which the choices for the
-    field will be derived, and which will be used to validate the
-    user's selection.
-
-``ModelChoiceField``
-~~~~~~~~~~~~~~~~~~~~
-
-Allows the selection of a single model object, suitable for
-representing a foreign key.
-
-The ``__unicode__`` method of the model will be called to generate
-string representations of the objects for use in the field's choices;
-to provide customized representations, subclass ``ModelChoiceField``
-and override ``label_from_instance``. This method will receive a model
-object, and should return a string suitable for representing it. For
-example::
-
-    class MyModelChoiceField(ModelChoiceField):
-        def label_from_instance(self, obj):
-            return "My Object #%i" % obj.id
-
-``ModelMultipleChoiceField``
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
-Allows the selection of one or more model objects, suitable for
-representing a many-to-many relation. As with ``ModelChoiceField``,
-you can use ``label_from_instance`` to customize the object
-representations.
-
-Creating custom fields
-----------------------
-
-If the built-in ``Field`` classes don't meet your needs, you can easily create
-custom ``Field`` classes. To do this, just create a subclass of
-``django.newforms.Field``. Its only requirements are that it implement a
-``clean()`` method and that its ``__init__()`` method accept the core arguments
-mentioned above (``required``, ``label``, ``initial``, ``widget``,
-``help_text``).
-
-Custom form and field validation
----------------------------------
-
-Form validation happens when the data is cleaned. If you want to customise
-this process, there are various places you can change, each one serving a
-different purpose. Three types of cleaning methods are run during form
-processing. These are normally executed when you call the ``is_valid()``
-method on a form. There are other things that can trigger cleaning and
-validation (accessing the ``errors`` attribute or calling ``full_clean()``
-directly), but normally they won't be needed.
-
-In general, any cleaning method can raise ``ValidationError`` if there is a
-problem with the data it is processing, passing the relevant error message to
-the ``ValidationError`` constructor. If no ``ValidationError`` is raised, the
-method should return the cleaned (normalised) data as a Python object.
-
-If you detect multiple errors during a cleaning method and wish to signal all
-of them to the form submitter, it is possible to pass a list of errors to the
-``ValidationError`` constructor.
-
-The three types of cleaning methods are:
-
-    * The ``clean()`` method on a Field subclass. This is responsible
-      for cleaning the data in a way that is generic for that type of field.
-      For example, a FloatField will turn the data into a Python ``float`` or
-      raise a ``ValidationError``.
-
-    * The ``clean_<fieldname>()`` method in a form subclass -- where
-      ``<fieldname>`` is replaced with the name of the form field attribute.
-      This method does any cleaning that is specific to that particular
-      attribute, unrelated to the type of field that it is. This method is not
-      passed any parameters. You will need to look up the value of the field
-      in ``self.cleaned_data`` and remember that it will be a Python object
-      at this point, not the original string submitted in the form (it will be
-      in ``cleaned_data`` because the general field ``clean()`` method, above,
-      has already cleaned the data once).
-
-      For example, if you wanted to validate that the contents of a
-      ``CharField`` called ``serialnumber`` was unique,
-      ``clean_serialnumber()`` would be the right place to do this. You don't
-      need a specific field (it's just a ``CharField``), but you want a
-      formfield-specific piece of validation and, possibly,
-      cleaning/normalizing the data.
-
-    * The Form subclass's ``clean()`` method. This method can perform
-      any validation that requires access to multiple fields from the form at
-      once. This is where you might put in things to check that if field ``A``
-      is supplied, field ``B`` must contain a valid email address and the
-      like. The data that this method returns is the final ``cleaned_data``
-      attribute for the form, so don't forget to return the full list of
-      cleaned data if you override this method (by default, ``Form.clean()``
-      just returns ``self.cleaned_data``).
-
-      Note that any errors raised by your ``Form.clean()`` override will not
-      be associated with any field in particular. They go into a special
-      "field" (called ``__all__``), which you can access via the
-      ``non_field_errors()`` method if you need to.
-
-These methods are run in the order given above, one field at a time.  That is,
-for each field in the form (in the order they are declared in the form
-definition), the ``Field.clean()`` method (or its override) is run, then
-``clean_<fieldname>()``. Finally, once those two methods are run for every
-field, the ``Form.clean()`` method, or its override, is executed.
-
-As mentioned above, any of these methods can raise a ``ValidationError``. For
-any field, if the ``Field.clean()`` method raises a ``ValidationError``, any
-field-specific cleaning method is not called. However, the cleaning methods
-for all remaining fields are still executed.
-
-The ``clean()`` method for the ``Form`` class or subclass is always run. If
-that method raises a ``ValidationError``, ``cleaned_data`` will be an empty
-dictionary.
-
-The previous paragraph means that if you are overriding ``Form.clean()``, you
-should iterate through ``self.cleaned_data.items()``, possibly considering the
-``_errors`` dictionary attribute on the form as well. In this way, you will
-already know which fields have passed their individual validation requirements.
-
-A simple example
-~~~~~~~~~~~~~~~~
-
-Here's a simple example of a custom field that validates its input is a string
-containing comma-separated e-mail addresses, with at least one address. We'll
-keep it simple and assume e-mail validation is contained in a function called
-``is_valid_email()``. The full class::
-
-    from django import newforms as forms
-
-    class MultiEmailField(forms.Field):
-        def clean(self, value):
-            if not value:
-                raise forms.ValidationError('Enter at least one e-mail address.')
-            emails = value.split(',')
-            for email in emails:
-                if not is_valid_email(email):
-                    raise forms.ValidationError('%s is not a valid e-mail address.' % email)
-            return emails
-
-Let's alter the ongoing ``ContactForm`` example to demonstrate how you'd use
-this in a form. Simply use ``MultiEmailField`` instead of ``forms.EmailField``,
-like so::
-
-    class ContactForm(forms.Form):
-        subject = forms.CharField(max_length=100)
-        message = forms.CharField()
-        senders = MultiEmailField()
-        cc_myself = forms.BooleanField(required=False)
-
-Widgets
-=======
-
-A widget is Django's representation of a HTML input element. The widget
-handles the rendering of the HTML, and the extraction of data from a GET/POST
-dictionary that corresponds to the widget.
-
-Django provides a representation of all the basic HTML widgets, plus some
-commonly used groups of widgets:
-
-    ============================  ===========================================
-    Widget                        HTML Equivalent
-    ============================  ===========================================
-    ``TextInput``                 ``<input type='text' ...``
-    ``PasswordInput``             ``<input type='password' ...``
-    ``HiddenInput``               ``<input type='hidden' ...``
-    ``MultipleHiddenInput``       Multiple ``<input type='hidden' ...``
-                                  instances.
-    ``FileInput``                 ``<input type='file' ...``
-    ``DateTimeInput``             ``<input type='text' ...``
-    ``Textarea``                  ``<textarea>...</textarea>``
-    ``CheckboxInput``             ``<input type='checkbox' ...``
-    ``Select``                    ``<select><option ...``
-    ``NullBooleanSelect``         Select widget with options 'Unknown',
-                                  'Yes' and 'No'
-    ``SelectMultiple``            ``<select multiple='multiple'><option ...``
-    ``RadioSelect``               ``<ul><li><input type='radio' ...``
-    ``CheckboxSelectMultiple``    ``<ul><li><input type='checkbox' ...``
-    ``MultiWidget``               Wrapper around multiple other widgets
-    ``SplitDateTimeWidget``       Wrapper around two ``TextInput`` widgets:
-                                  one for the Date, and one for the Time.
-    ============================  ===========================================
-
-**New in Django development version:** The ``DateTimeInput`` has been added
-since the last release.
-
-Specifying widgets
-------------------
-
-Whenever you specify a field on a form, Django will use a default widget
-that is appropriate to the type of data that is to be displayed. To find
-which widget is used on which field, see the documentation for the
-built-in Field classes.
-
-However, if you want to use a different widget for a field, you can -
-just use the 'widget' argument on the field definition. For example::
-
-    class CommentForm(forms.Form):
-        name = forms.CharField()
-        url = forms.URLField()
-        comment = forms.CharField(widget=forms.Textarea)
-
-This would specify a form with a comment that uses a larger Textarea widget,
-rather than the default TextInput widget.
-
-Customizing widget instances
-----------------------------
-
-When Django renders a widget as HTML, it only renders the bare minimum
-HTML - Django doesn't add a class definition, or any other widget-specific
-attributes. This means that all 'TextInput' widgets will appear the same
-on your web page.
-
-If you want to make one widget look different to another, you need to
-specify additional attributes for each widget. When you specify a
-widget, you can provide a list of attributes that will be added to the
-rendered HTML for the widget.
-
-For example, take the following simple form::
-
-    class CommentForm(forms.Form):
-        name = forms.CharField()
-        url = forms.URLField()
-        comment = forms.CharField()
-
-This form will include three default TextInput widgets, with default rendering -
-no CSS class, no extra attributes. This means that the input boxes provided for
-each widget will be rendered exactly the same::
-
-    >>> f = CommentForm(auto_id=False)
-    >>> f.as_table()
-    <tr><th>Name:</th><td><input type="text" name="name" /></td></tr>
-    <tr><th>Url:</th><td><input type="text" name="url"/></td></tr>
-    <tr><th>Comment:</th><td><input type="text" name="comment" /></td></tr>
-
-On a real web page, you probably don't want every widget to look the same. You
-might want a larger input element for the comment, and you might want the
-'name' widget to have some special CSS class. To do this, you specify a
-custom widget for your fields, and specify some attributes to use
-when rendering those widgets::
-
-    class CommentForm(forms.Form):
-        name = forms.CharField(
-                    widget=forms.TextInput(attrs={'class':'special'}))
-        url = forms.URLField()
-        comment = forms.CharField(
-                   widget=forms.TextInput(attrs={'size':'40'}))
-
-Django will then include the extra attributes in the rendered output::
-
-    >>> f = CommentForm(auto_id=False)
-    >>> f.as_table()
-    <tr><th>Name:</th><td><input type="text" name="name" class="special"/></td></tr>
-    <tr><th>Url:</th><td><input type="text" name="url"/></td></tr>
-    <tr><th>Comment:</th><td><input type="text" name="comment" size="40"/></td></tr>
-
-Custom Widgets
---------------
-
-When you start to write a lot of forms, you will probably find that you will
-reuse certain sets of widget attributes over and over again. Rather than
-repeat these attribute definitions every time you need them, Django allows
-you to capture those definitions as a custom widget.
-
-For example, if you find that you are including a lot of comment fields on
-forms, you could capture the idea of a ``TextInput`` with a specific
-default ``size`` attribute as a custom extension to the ``TextInput`` widget::
-
-    class CommentWidget(forms.TextInput):
-        def __init__(self, *args, **kwargs):
-            attrs = kwargs.setdefault('attrs',{})
-            if 'size' not in attrs:
-                attrs['size'] = 40
-            super(CommentWidget, self).__init__(*args, **kwargs)
-
-We allow the ``size`` attribute to be overridden by the user, but, by default,
-this widget will behave as if ``attrs={'size': 40}`` was always passed into the
-constructor.
-
-Then you can use this widget in your forms::
-
-    class CommentForm(forms.Form):
-        name = forms.CharField()
-        url = forms.URLField()
-        comment = forms.CharField(widget=CommentWidget)
-
-You can even customize your custom widget, in the same way as you would
-any other widget. Adding a once-off class to your ``CommentWidget`` is as
-simple as adding an attribute definition::
-
-    class CommentForm(forms.Form):
-        name = forms.CharField(max_length=20)
-        url = forms.URLField()
-        comment = forms.CharField(
-                    widget=CommentWidget(attrs={'class': 'special'}))
-
-Django also makes it easy to specify a custom field type that uses your custom
-widget. For example, you could define a customized field type for comments
-by defining::
-
-    class CommentInput(forms.CharField):
-        widget = CommentWidget
-
-You can then use this field whenever you have a form that requires a comment::
-
-    class CommentForm(forms.Form):
-        name = forms.CharField()
-        url = forms.URLField()
-        comment = CommentInput()
-
-Generating forms for models
-===========================
-
-The prefered way of generating forms that work with models is explained in the
-`ModelForms documentation`_.
-
-Looking for the ``form_for_model`` and ``form_for_instance`` documentation?
-They've been deprecated, but you can still `view the documentation`_.
-
-.. _ModelForms documentation: ../modelforms/
-.. _view the documentation: ../form_for_model/
-
-Media
-=====
-
-Rendering an attractive and easy-to-use web form requires more than just 
-HTML - it also requires CSS stylesheets, and if you want to use fancy 
-"Web2.0" widgets, you may also need to include some JavaScript on each 
-page. The exact combination of CSS and JavaScript that is required for 
-any given page will depend upon the widgets that are in use on that page.
-
-This is where Django media definitions come in. Django allows you to 
-associate different media files with the forms and widgets that require
-that media. For example, if you want to use a calendar to render DateFields, 
-you can define a custom Calendar widget. This widget can then be associated 
-with the CSS and Javascript that is required to render the calendar. When 
-the Calendar widget is used on a form, Django is able to identify the CSS and
-JavaScript files that are required, and provide the list of file names
-in a form suitable for easy inclusion on your web page.
-
-.. admonition:: Media and Django Admin
-
-    The Django Admin application defines a number of customized widgets
-    for calendars, filtered selections, and so on. These widgets define
-    media requirements, and the Django Admin uses the custom widgets
-    in place of the Django defaults. The Admin templates will only include
-    those media files that are required to render the widgets on any 
-    given page.
-    
-    If you like the widgets that the Django Admin application uses,
-    feel free to use them in your own application! They're all stored
-    in ``django.contrib.admin.widgets``.
-
-.. admonition:: Which JavaScript toolkit?
-
-    Many JavaScript toolkits exist, and many of them include widgets (such
-    as calendar widgets) that can be used to enhance your application. 
-    Django has deliberately avoided blessing any one JavaScript toolkit.
-    Each toolkit has its own relative strengths and weaknesses - use 
-    whichever toolkit suits your requirements. Django is able to integrate
-    with any JavaScript toolkit. 
-
-Media as a static definition
-----------------------------
-
-The easiest way to define media is as a static definition. Using this method,
-the media declaration is an inner class. The properties of the inner class
-define the media requirements. 
-
-Here's a simple example::
-
-    class CalendarWidget(forms.TextInput):
-        class Media:
-            css = {
-                'all': ('pretty.css',)
-            }
-            js = ('animations.js', 'actions.js')
-
-This code defines a ``CalendarWidget``, which will be based on ``TextInput``.
-Every time the CalendarWidget is used on a form, that form will be directed 
-to include the CSS file ``pretty.css``, and the JavaScript files 
-``animations.js`` and ``actions.js``. 
-
-This static media definition is converted at runtime into a widget property
-named ``media``. The media for a CalendarWidget instance can be retrieved 
-through this property::
-
-    >>> w = CalendarWidget()
-    >>> print w.media
-    <link href="http://media.example.com/pretty.css" type="text/css" media="all" rel="stylesheet" />
-    <script type="text/javascript" src="http://media.example.com/animations.js"></script>
-    <script type="text/javascript" src="http://media.example.com/actions.js"></script>
-
-Here's a list of all possible ``Media`` options. There are no required options.
-
-``css``
-~~~~~~~
-
-A dictionary describing the CSS files required for various forms of output 
-media. 
-
-The values in the dictionary should be a tuple/list of file names. See
-`the section on media paths`_ for details of how to specify paths to media 
-files.
-
-.. _the section on media paths: `Paths in media definitions`_
-
-The keys in the dictionary are the output media types. These are the same 
-types accepted by CSS files in media declarations: 'all', 'aural', 'braille',
-'embossed', 'handheld', 'print', 'projection', 'screen', 'tty' and 'tv'. If
-you need to have different stylesheets for different media types, provide
-a list of CSS files for each output medium. The following example would
-provide two CSS options -- one for the screen, and one for print::
-
-    class Media:
-        css = {
-            'screen': ('pretty.css',),
-            'print': ('newspaper.css',)
-        }
-
-If a group of CSS files are appropriate for multiple output media types, 
-the dictionary key can be a comma separated list of output media types. 
-In the following example, TV's and projectors will have the same media 
-requirements::
-
-    class Media:
-        css = {
-            'screen': ('pretty.css',),
-            'tv,projector': ('lo_res.css',),
-            'print': ('newspaper.css',)
-        }
-    
-If this last CSS definition were to be rendered, it would become the following HTML::
-
-    <link href="http://media.example.com/pretty.css" type="text/css" media="screen" rel="stylesheet" />
-    <link href="http://media.example.com/lo_res.css" type="text/css" media="tv,projector" rel="stylesheet" />
-    <link href="http://media.example.com/newspaper.css" type="text/css" media="print" rel="stylesheet" />
-                 
-``js``
-~~~~~~
-
-A tuple describing the required javascript files. See
-`the section on media paths`_ for details of how to specify paths to media 
-files.
-
-``extend``   
-~~~~~~~~~~
-
-A boolean defining inheritance behavior for media declarations. 
-
-By default, any object using a static media definition will inherit all the
-media associated with the parent widget. This occurs regardless of how the 
-parent defines its media requirements. For example, if we were to extend our
-basic Calendar widget from the example above:: 
-
-    class FancyCalendarWidget(CalendarWidget):
-        class Media:
-            css = {
-                'all': ('fancy.css',)
-            }
-            js = ('whizbang.js',)
-
-    >>> w = FancyCalendarWidget()
-    >>> print w.media
-    <link href="http://media.example.com/pretty.css" type="text/css" media="all" rel="stylesheet" />
-    <link href="http://media.example.com/fancy.css" type="text/css" media="all" rel="stylesheet" />
-    <script type="text/javascript" src="http://media.example.com/animations.js"></script>
-    <script type="text/javascript" src="http://media.example.com/actions.js"></script>
-    <script type="text/javascript" src="http://media.example.com/whizbang.js"></script>
-
-The FancyCalendar widget inherits all the media from it's parent widget. If 
-you don't want media to be inherited in this way, add an ``extend=False``
-declaration to the media declaration::
-
-    class FancyCalendar(Calendar):
-        class Media:
-            extend = False 
-            css = {
-                'all': ('fancy.css',)
-            }
-            js = ('whizbang.js',)
-
-    >>> w = FancyCalendarWidget()
-    >>> print w.media
-    <link href="http://media.example.com/fancy.css" type="text/css" media="all" rel="stylesheet" />
-    <script type="text/javascript" src="http://media.example.com/whizbang.js"></script>
-
-If you require even more control over media inheritance, define your media 
-using a `dynamic property`_. Dynamic properties give you complete control over
-which media files are inherited, and which are not.
-
-.. _dynamic property: `Media as a dynamic property`_
-    
-Media as a dynamic property
----------------------------
-
-If you need to perform some more sophisticated manipulation of media
-requirements, you can define the media property directly. This is done
-by defining a model property that returns an instance of ``forms.Media``.
-The constructor for ``forms.Media`` accepts ``css`` and ``js`` keyword 
-arguments in the same format as that used in a static media definition.
-
-For example, the static media definition for our Calendar Widget could
-also be defined in a dynamic fashion::
-
-    class CalendarWidget(forms.TextInput):
-        def _media(self):
-            return forms.Media(css={'all': ('pretty.css',)},
-                               js=('animations.js', 'actions.js'))
-        media = property(_media)
-
-See the section on `Media objects`_ for more details on how to construct
-return values for dynamic media properties.
-
-Paths in media definitions
---------------------------
-
-Paths used to specify media can be either relative or absolute. If a path 
-starts with '/', 'http://' or 'https://', it will be interpreted as an absolute
-path, and left as-is. All other paths will be prepended with the value of
-``settings.MEDIA_URL``. For example, if the MEDIA_URL for your site was
-``http://media.example.com/``::
-
-    class CalendarWidget(forms.TextInput):
-        class Media:
-            css = {
-                'all': ('/css/pretty.css',),
-            }
-            js = ('animations.js', 'http://othersite.com/actions.js')
-
-    >>> w = CalendarWidget()
-    >>> print w.media
-    <link href="/css/pretty.css" type="text/css" media="all" rel="stylesheet" />
-    <script type="text/javascript" src="http://media.example.com/animations.js"></script>
-    <script type="text/javascript" src="http://othersite.com/actions.js"></script>
-
-Media objects
--------------
-
-When you interrogate the media attribute of a widget or form, the value that
-is returned is a ``forms.Media`` object. As we have already seen, the string
-representation of a Media object is the HTML required to include media 
-in the ``<head>`` block of your HTML page. 
-
-However, Media objects have some other interesting properties.
-
-Media subsets
-~~~~~~~~~~~~~
-
-If you only want media of a particular type, you can use the subscript operator 
-to filter out a medium of interest. For example::
-
-    >>> w = CalendarWidget()
-    >>> print w.media
-    <link href="http://media.example.com/pretty.css" type="text/css" media="all" rel="stylesheet" />
-    <script type="text/javascript" src="http://media.example.com/animations.js"></script>
-    <script type="text/javascript" src="http://media.example.com/actions.js"></script>
-
-    >>> print w.media['css']
-    <link href="http://media.example.com/pretty.css" type="text/css" media="all" rel="stylesheet" />
-
-When you use the subscript operator, the value that is returned is a new 
-Media object -- but one that only contains the media of interest.
-
-Combining media objects
-~~~~~~~~~~~~~~~~~~~~~~~
-
-Media objects can also be added together. When two media objects are added,
-the resulting Media object contains the union of the media from both files::
-
-    class CalendarWidget(forms.TextInput):
-        class Media:
-            css = {
-                'all': ('pretty.css',)
-            }
-            js = ('animations.js', 'actions.js')
-
-    class OtherWidget(forms.TextInput):
-        class Media:
-            js = ('whizbang.js',)
-
-    >>> w1 = CalendarWidget()
-    >>> w2 = OtherWidget()
-    >>> print w1+w2
-    <link href="http://media.example.com/pretty.css" type="text/css" media="all" rel="stylesheet" />
-    <script type="text/javascript" src="http://media.example.com/animations.js"></script>
-    <script type="text/javascript" src="http://media.example.com/actions.js"></script>
-    <script type="text/javascript" src="http://media.example.com/whizbang.js"></script>
-    
-Media on Forms
---------------
-
-Widgets aren't the only objects that can have media definitions -- forms
-can also define media. The rules for media definitions on forms are the
-same as the rules for widgets: declarations can be static or dynamic;
-path and inheritance rules for those declarations are exactly the same.
-
-Regardless of whether you define a media declaration, *all* Form objects 
-have a media property. The default value for this property is the result 
-of adding the media definitions for all widgets that are part of the form::
-
-    class ContactForm(forms.Form):
-        date = DateField(widget=CalendarWidget)
-        name = CharField(max_length=40, widget=OtherWidget)
-
-    >>> f = ContactForm()
-    >>> f.media
-    <link href="http://media.example.com/pretty.css" type="text/css" media="all" rel="stylesheet" />
-    <script type="text/javascript" src="http://media.example.com/animations.js"></script>
-    <script type="text/javascript" src="http://media.example.com/actions.js"></script>
-    <script type="text/javascript" src="http://media.example.com/whizbang.js"></script>
-
-If you want to associate additional media with a form -- for example, CSS for form 
-layout -- simply add a media declaration to the form::
-
-    class ContactForm(forms.Form):
-        date = DateField(widget=CalendarWidget)
-        name = CharField(max_length=40, widget=OtherWidget)
-
-        class Media:
-            css = {
-                'all': ('layout.css',)
-            }
-            
-    >>> f = ContactForm()
-    >>> f.media
-    <link href="http://media.example.com/pretty.css" type="text/css" media="all" rel="stylesheet" />
-    <link href="http://media.example.com/layout.css" type="text/css" media="all" rel="stylesheet" />
-    <script type="text/javascript" src="http://media.example.com/animations.js"></script>
-    <script type="text/javascript" src="http://media.example.com/actions.js"></script>
-    <script type="text/javascript" src="http://media.example.com/whizbang.js"></script>
-
-Formsets
-========
-
-A formset is a layer of abstraction to working with multiple forms on the same
-page. It can be best compared to a data grid. Let's say you have the following
-form::
-
-    >>> from django import newforms as forms
-    >>> class ArticleForm(forms.Form):
-    ...     title = forms.CharField()
-    ...     pub_date = forms.DateField()
-
-You might want to allow the user to create several articles at once. To create
-a formset of out of an ``ArticleForm`` you would do::
-
-    >>> from django.newforms.formsets import formset_factory
-    >>> ArticleFormSet = formset_factory(ArticleForm)
-
-You now have created a formset named ``ArticleFormSet``. The formset gives you
-the ability to iterate over the forms in the formset and display them as you
-would with a regular form::
-
-    >>> formset = ArticleFormSet()
-    >>> for form in formset.forms:
-    ...     print form.as_table()
-    <tr><th><label for="id_form-0-title">Title:</label></th><td><input type="text" name="form-0-title" id="id_form-0-title" /></td></tr>
-    <tr><th><label for="id_form-0-pub_date">Pub date:</label></th><td><input type="text" name="form-0-pub_date" id="id_form-0-pub_date" /></td></tr>
-
-As you can see it only displayed one form. This is because by default the
-``formset_factory`` defines one extra form. This can be controlled with the
-``extra`` parameter::
-
-    >>> ArticleFormSet = formset_factory(ArticleForm, extra=2)
-
-Using initial data with a formset
----------------------------------
-
-Initial data is what drives the main usability of a formset. As shown above
-you can define the number of extra forms. What this means is that you are
-telling the formset how many additional forms to show in addition to the
-number of forms it generates from the initial data. Lets take a look at an
-example::
-
-    >>> ArticleFormSet = formset_factory(ArticleForm, extra=2)
-    >>> formset = ArticleFormSet(initial=[
-    ...     {'title': u'Django is now open source',
-    ...      'pub_date': datetime.date.today()},
-    ... ])
-    
-    >>> for form in formset.forms:
-    ...     print form.as_table()
-    <tr><th><label for="id_form-0-title">Title:</label></th><td><input type="text" name="form-0-title" value="Django is now open source" id="id_form-0-title" /></td></tr>
-    <tr><th><label for="id_form-0-pub_date">Pub date:</label></th><td><input type="text" name="form-0-pub_date" value="2008-05-12" id="id_form-0-pub_date" /></td></tr>
-    <tr><th><label for="id_form-1-title">Title:</label></th><td><input type="text" name="form-1-title" id="id_form-1-title" /></td></tr>
-    <tr><th><label for="id_form-1-pub_date">Pub date:</label></th><td><input type="text" name="form-1-pub_date" id="id_form-1-pub_date" /></td></tr>
-    <tr><th><label for="id_form-2-title">Title:</label></th><td><input type="text" name="form-2-title" id="id_form-2-title" /></td></tr>
-    <tr><th><label for="id_form-2-pub_date">Pub date:</label></th><td><input type="text" name="form-2-pub_date" id="id_form-2-pub_date" /></td></tr>
-
-There are now a total of three forms showing above. One for the initial data
-that was passed in and two extra forms. Also note that we are passing in a
-list of dictionaries as the initial data.
-
-Limiting the maximum number of forms
-------------------------------------
-
-The ``max_num`` parameter to ``formset_factory`` gives you the ability to
-force the maximum number of forms the formset will display::
-
-    >>> ArticleFormSet = formset_factory(ArticleForm, extra=2, max_num=1)
-    >>> formset = ArticleFormset()
-    >>> for form in formset.forms:
-    ...     print form.as_table()
-    <tr><th><label for="id_form-0-title">Title:</label></th><td><input type="text" name="form-0-title" id="id_form-0-title" /></td></tr>
-    <tr><th><label for="id_form-0-pub_date">Pub date:</label></th><td><input type="text" name="form-0-pub_date" id="id_form-0-pub_date" /></td></tr>
-
-The default value of ``max_num`` is ``0`` which is the same as saying put no
-limit on the number forms displayed.
-
-Formset validation
-------------------
-
-Validation with a formset is about identical to a regular ``Form``. There is
-an ``is_valid`` method on the formset to provide a convenient way to validate
-each form in the formset::
-
-    >>> ArticleFormSet = formset_factory(ArticleForm)
-    >>> formset = ArticleFormSet({})
-    >>> formset.is_valid()
-    True
-
-We passed in no data to the formset which is resulting in a valid form. The
-formset is smart enough to ignore extra forms that were not changed. If we
-attempt to provide an article, but fail to do so::
-
-    >>> data = {
-    ...     'form-TOTAL_FORMS': u'1',
-    ...     'form-INITIAL_FORMS': u'1',
-    ...     'form-0-title': u'Test',
-    ...     'form-0-pub_date': u'',
-    ... }
-    >>> formset = ArticleFormSet(data)
-    >>> formset.is_valid()
-    False
-    >>> formset.errors
-    [{'pub_date': [u'This field is required.']}]
-
-As we can see the formset properly performed validation and gave us the
-expected errors.
-
-Understanding the ManagementForm
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
-You may have noticed the additional data that was required in the formset's
-data above. This data is coming from the ``ManagementForm``. This form is
-dealt with internally to the formset. If you don't use it, it will result in
-an exception::
-
-    >>> data = {
-    ...     'form-0-title': u'Test',
-    ...     'form-0-pub_date': u'',
-    ... }
-    >>> formset = ArticleFormSet(data)
-    Traceback (most recent call last):
-    ...
-    django.newforms.util.ValidationError: [u'ManagementForm data is missing or has been tampered with']
-
-It is used to keep track of how many form instances are being displayed. If
-you are adding new forms via javascript, you should increment the count fields
-in this form as well.
-
-Custom formset validation
-~~~~~~~~~~~~~~~~~~~~~~~~~
-
-A formset has a ``clean`` method similar to the one on a ``Form`` class. This
-is where you define your own validation that deals at the formset level::
-
-    >>> from django.newforms.formsets import BaseFormSet
-    
-    >>> class BaseArticleFormSet(BaseFormSet):
-    ...     def clean(self):
-    ...         raise forms.ValidationError, u'An error occured.'
-    
-    >>> ArticleFormSet = formset_factory(ArticleForm, formset=BaseArticleFormSet)
-    >>> formset = ArticleFormSet({})
-    >>> formset.is_valid()
-    False
-    >>> formset.non_form_errors()
-    [u'An error occured.']
-
-The formset ``clean`` method is called after all the ``Form.clean`` methods
-have been called. The errors will be found using the ``non_form_errors()``
-method on the formset.
-
-Dealing with ordering and deletion of forms
--------------------------------------------
-
-Common use cases with a formset is dealing with ordering and deletion of the
-form instances. This has been dealt with for you. The ``formset_factory``
-provides two optional parameters ``can_order`` and ``can_delete`` that will do
-the extra work of adding the extra fields and providing simpler ways of
-getting to that data.
-
-``can_order``
-~~~~~~~~~~~~~
-
-Default: ``False``
-
-Lets create a formset with the ability to order::
-
-    >>> ArticleFormSet = formset_factory(ArticleForm, can_order=True)
-    >>> formset = ArticleFormSet(initial=[
-    ...     {'title': u'Article #1', 'pub_date': datetime.date(2008, 5, 10)},
-    ...     {'title': u'Article #2', 'pub_date': datetime.date(2008, 5, 11)},
-    ... ])
-    >>> for form in formset.forms:
-    ...     print form.as_table()
-    <tr><th><label for="id_form-0-title">Title:</label></th><td><input type="text" name="form-0-title" value="Article #1" id="id_form-0-title" /></td></tr>
-    <tr><th><label for="id_form-0-pub_date">Pub date:</label></th><td><input type="text" name="form-0-pub_date" value="2008-05-10" id="id_form-0-pub_date" /></td></tr>
-    <tr><th><label for="id_form-0-ORDER">Order:</label></th><td><input type="text" name="form-0-ORDER" value="1" id="id_form-0-ORDER" /></td></tr>
-    <tr><th><label for="id_form-1-title">Title:</label></th><td><input type="text" name="form-1-title" value="Article #2" id="id_form-1-title" /></td></tr>
-    <tr><th><label for="id_form-1-pub_date">Pub date:</label></th><td><input type="text" name="form-1-pub_date" value="2008-05-11" id="id_form-1-pub_date" /></td></tr>
-    <tr><th><label for="id_form-1-ORDER">Order:</label></th><td><input type="text" name="form-1-ORDER" value="2" id="id_form-1-ORDER" /></td></tr>
-    <tr><th><label for="id_form-2-title">Title:</label></th><td><input type="text" name="form-2-title" id="id_form-2-title" /></td></tr>
-    <tr><th><label for="id_form-2-pub_date">Pub date:</label></th><td><input type="text" name="form-2-pub_date" id="id_form-2-pub_date" /></td></tr>
-    <tr><th><label for="id_form-2-ORDER">Order:</label></th><td><input type="text" name="form-2-ORDER" id="id_form-2-ORDER" /></td></tr>
-
-This adds an additional field to each form. This new field is named ``ORDER``
-and is an ``forms.IntegerField``. For the forms that came from the initial
-data it automatically assigned them a numeric value. Lets look at what will
-happen when the user changes these values::
-
-    >>> data = {
-    ...     'form-TOTAL_FORMS': u'3',
-    ...     'form-INITIAL_FORMS': u'2',
-    ...     'form-0-title': u'Article #1',
-    ...     'form-0-pub_date': u'2008-05-10',
-    ...     'form-0-ORDER': u'2',
-    ...     'form-1-title': u'Article #2',
-    ...     'form-1-pub_date': u'2008-05-11',
-    ...     'form-1-ORDER': u'1',
-    ...     'form-2-title': u'Article #3',
-    ...     'form-2-pub_date': u'2008-05-01',
-    ...     'form-2-ORDER': u'0',
-    ... }
-    
-    >>> formset = ArticleFormSet(data, initial=[
-    ...     {'title': u'Article #1', 'pub_date': datetime.date(2008, 5, 10)},
-    ...     {'title': u'Article #2', 'pub_date': datetime.date(2008, 5, 11)},
-    ... ])
-    >>> formset.is_valid()
-    True
-    >>> for form in formset.ordered_forms:
-    ...     print form.cleaned_data
-    {'pub_date': datetime.date(2008, 5, 1), 'ORDER': 0, 'title': u'Article #3'}
-    {'pub_date': datetime.date(2008, 5, 11), 'ORDER': 1, 'title': u'Article #2'}
-    {'pub_date': datetime.date(2008, 5, 10), 'ORDER': 2, 'title': u'Article #1'}
-
-``can_delete``
-~~~~~~~~~~~~~~
-
-Default: ``False``
-
-Lets create a formset with the ability to delete::
-
-    >>> ArticleFormSet = formset_factory(ArticleForm, can_delete=True)
-    >>> formset = ArticleFormSet(initial=[
-    ...     {'title': u'Article #1', 'pub_date': datetime.date(2008, 5, 10)},
-    ...     {'title': u'Article #2', 'pub_date': datetime.date(2008, 5, 11)},
-    ... ])
-    >>> for form in formset.forms:
-    ....    print form.as_table()
-    <input type="hidden" name="form-TOTAL_FORMS" value="3" id="id_form-TOTAL_FORMS" /><input type="hidden" name="form-INITIAL_FORMS" value="2" id="id_form-INITIAL_FORMS" />
-    <tr><th><label for="id_form-0-title">Title:</label></th><td><input type="text" name="form-0-title" value="Article #1" id="id_form-0-title" /></td></tr>
-    <tr><th><label for="id_form-0-pub_date">Pub date:</label></th><td><input type="text" name="form-0-pub_date" value="2008-05-10" id="id_form-0-pub_date" /></td></tr>
-    <tr><th><label for="id_form-0-DELETE">Delete:</label></th><td><input type="checkbox" name="form-0-DELETE" id="id_form-0-DELETE" /></td></tr>
-    <tr><th><label for="id_form-1-title">Title:</label></th><td><input type="text" name="form-1-title" value="Article #2" id="id_form-1-title" /></td></tr>
-    <tr><th><label for="id_form-1-pub_date">Pub date:</label></th><td><input type="text" name="form-1-pub_date" value="2008-05-11" id="id_form-1-pub_date" /></td></tr>
-    <tr><th><label for="id_form-1-DELETE">Delete:</label></th><td><input type="checkbox" name="form-1-DELETE" id="id_form-1-DELETE" /></td></tr>
-    <tr><th><label for="id_form-2-title">Title:</label></th><td><input type="text" name="form-2-title" id="id_form-2-title" /></td></tr>
-    <tr><th><label for="id_form-2-pub_date">Pub date:</label></th><td><input type="text" name="form-2-pub_date" id="id_form-2-pub_date" /></td></tr>
-    <tr><th><label for="id_form-2-DELETE">Delete:</label></th><td><input type="checkbox" name="form-2-DELETE" id="id_form-2-DELETE" /></td></tr>
-
-Similar to ``can_order`` this adds a new field to each form named ``DELETE``
-and is a ``forms.BooleanField``. When data comes through marking any of the
-delete fields you can access them with ``deleted_forms``::
-
-    >>> data = {
-    ...     'form-TOTAL_FORMS': u'3',
-    ...     'form-INITIAL_FORMS': u'2',
-    ...     'form-0-title': u'Article #1',
-    ...     'form-0-pub_date': u'2008-05-10',
-    ...     'form-0-DELETE': u'on',
-    ...     'form-1-title': u'Article #2',
-    ...     'form-1-pub_date': u'2008-05-11',
-    ...     'form-1-DELETE': u'',
-    ...     'form-2-title': u'',
-    ...     'form-2-pub_date': u'',
-    ...     'form-2-DELETE': u'',
-    ... }
-    
-    >>> formset = ArticleFormSet(data, initial=[
-    ...     {'title': u'Article #1', 'pub_date': datetime.date(2008, 5, 10)},
-    ...     {'title': u'Article #2', 'pub_date': datetime.date(2008, 5, 11)},
-    ... ])
-    >>> [form.cleaned_data for form in formset.deleted_forms]
-    [{'DELETE': True, 'pub_date': datetime.date(2008, 5, 10), 'title': u'Article #1'}]
-
-Adding additional fields to a formset
--------------------------------------
-
-If you need to add additional fields to the formset this can be easily
-accomplished. The formset base class provides an ``add_fields`` method. You
-can simply override this method to add your own fields or even redefine the
-default fields/attributes of the order and deletion fields::
-
-    >>> class BaseArticleFormSet(BaseFormSet):
-    ...     def add_fields(self, form, index):
-    ...         super(BaseArticleFormSet, self).add_fields(form, index)
-    ...         form.fields["my_field"] = forms.CharField()
-
-    >>> ArticleFormSet = formset_factory(ArticleForm, formset=BaseArticleFormSet)
-    >>> formset = ArticleFormSet()
-    >>> for form in formset.forms:
-    ...     print form.as_table()
-    <tr><th><label for="id_form-0-title">Title:</label></th><td><input type="text" name="form-0-title" id="id_form-0-title" /></td></tr>
-    <tr><th><label for="id_form-0-pub_date">Pub date:</label></th><td><input type="text" name="form-0-pub_date" id="id_form-0-pub_date" /></td></tr>
-    <tr><th><label for="id_form-0-my_field">My field:</label></th><td><input type="text" name="form-0-my_field" id="id_form-0-my_field" /></td></tr>
-
-Using a formset in views and templates
---------------------------------------
-
-Using a formset inside a view is as easy as using a regular ``Form`` class.
-The only thing you will want to be aware of is making sure to use the
-management form inside the template. Lets look at a sample view::
-
-    def manage_articles(request):
-        ArticleFormSet = formset_factory(ArticleForm)
-        if request.method == 'POST':
-            formset = ArticleFormSet(request.POST, request.FILES)
-            if formset.is_valid():
-                # do something with the formset.cleaned_data
-        else:
-            formset = ArticleFormSet()
-        return render_to_response('manage_articles.html', {'formset': formset})
-
-The ``manage_articles.html`` template might look like this::
-
-    <form method="POST" action="">
-        {{ formset.management_form }}
-        <table>
-            {% for form in formset.forms %}
-            {{ form }}
-            {% endfor %}
-        </table>
-    </form>
-
-However the above can be slightly shortcutted and let the formset itself deal
-with the management form::
-
-    <form method="POST" action="">
-        <table>
-            {{ formset }}
-        </table>
-    </form>
-
-The above ends up calling the ``as_table`` method on the formset class.
-
-More coming soon
-================
-
-That's all the documentation for now. For more, see the file
-http://code.djangoproject.com/browser/django/trunk/tests/regressiontests/forms
--- the unit tests for ``django.newforms``. This can give you a good idea of
-what's possible. (Each submodule there contains separate tests.)
-
-If you're really itching to learn and use this library, please be patient.
-We're working hard on finishing both the code and documentation.
-- 
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