gis: Merged revisions 6021-6393 via svnmerge from [repos:django/trunk trunk].

git-svn-id: http://code.djangoproject.com/svn/django/branches/gis@6394 bcc190cf-cafb-0310-a4f2-bffc1f526a37

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diff --git a/tests/regressiontests/forms/forms.py b/tests/regressiontests/forms/forms.py
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+++ b/tests/regressiontests/forms/forms.py
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+# -*- coding: utf-8 -*-
+tests = r"""
+>>> from django.newforms import *
+>>> import datetime
+>>> import time
+>>> import re
+>>> try:
+...     from decimal import Decimal
+... except ImportError:
+...     from django.utils._decimal import Decimal
+
+#########
+# Forms #
+#########
+
+A Form is a collection of Fields. It knows how to validate a set of data and it
+knows how to render itself in a couple of default ways (e.g., an HTML table).
+You can pass it data in __init__(), as a dictionary.
+
+# Form ########################################################################
+
+>>> class Person(Form):
+...     first_name = CharField()
+...     last_name = CharField()
+...     birthday = DateField()
+
+Pass a dictionary to a Form's __init__().
+>>> p = Person({'first_name': u'John', 'last_name': u'Lennon', 'birthday': u'1940-10-9'})
+>>> p.is_bound
+True
+>>> p.errors
+{}
+>>> p.is_valid()
+True
+>>> p.errors.as_ul()
+u''
+>>> p.errors.as_text()
+u''
+>>> p.cleaned_data
+{'first_name': u'John', 'last_name': u'Lennon', 'birthday': datetime.date(1940, 10, 9)}
+>>> print p['first_name']
+<input type="text" name="first_name" value="John" id="id_first_name" />
+>>> print p['last_name']
+<input type="text" name="last_name" value="Lennon" id="id_last_name" />
+>>> print p['birthday']
+<input type="text" name="birthday" value="1940-10-9" id="id_birthday" />
+>>> print p['nonexistentfield']
+Traceback (most recent call last):
+...
+KeyError: "Key 'nonexistentfield' not found in Form"
+
+>>> for boundfield in p:
+...     print boundfield
+<input type="text" name="first_name" value="John" id="id_first_name" />
+<input type="text" name="last_name" value="Lennon" id="id_last_name" />
+<input type="text" name="birthday" value="1940-10-9" id="id_birthday" />
+>>> for boundfield in p:
+...     print boundfield.label, boundfield.data
+First name John
+Last name Lennon
+Birthday 1940-10-9
+>>> print p
+<tr><th><label for="id_first_name">First name:</label></th><td><input type="text" name="first_name" value="John" id="id_first_name" /></td></tr>
+<tr><th><label for="id_last_name">Last name:</label></th><td><input type="text" name="last_name" value="Lennon" id="id_last_name" /></td></tr>
+<tr><th><label for="id_birthday">Birthday:</label></th><td><input type="text" name="birthday" value="1940-10-9" id="id_birthday" /></td></tr>
+
+Empty dictionaries are valid, too.
+>>> p = Person({})
+>>> p.is_bound
+True
+>>> p.errors
+{'first_name': [u'This field is required.'], 'last_name': [u'This field is required.'], 'birthday': [u'This field is required.']}
+>>> p.is_valid()
+False
+>>> p.cleaned_data
+Traceback (most recent call last):
+...
+AttributeError: 'Person' object has no attribute 'cleaned_data'
+>>> print p
+<tr><th><label for="id_first_name">First name:</label></th><td><ul class="errorlist"><li>This field is required.</li></ul><input type="text" name="first_name" id="id_first_name" /></td></tr>
+<tr><th><label for="id_last_name">Last name:</label></th><td><ul class="errorlist"><li>This field is required.</li></ul><input type="text" name="last_name" id="id_last_name" /></td></tr>
+<tr><th><label for="id_birthday">Birthday:</label></th><td><ul class="errorlist"><li>This field is required.</li></ul><input type="text" name="birthday" id="id_birthday" /></td></tr>
+>>> print p.as_table()
+<tr><th><label for="id_first_name">First name:</label></th><td><ul class="errorlist"><li>This field is required.</li></ul><input type="text" name="first_name" id="id_first_name" /></td></tr>
+<tr><th><label for="id_last_name">Last name:</label></th><td><ul class="errorlist"><li>This field is required.</li></ul><input type="text" name="last_name" id="id_last_name" /></td></tr>
+<tr><th><label for="id_birthday">Birthday:</label></th><td><ul class="errorlist"><li>This field is required.</li></ul><input type="text" name="birthday" id="id_birthday" /></td></tr>
+>>> print p.as_ul()
+<li><ul class="errorlist"><li>This field is required.</li></ul><label for="id_first_name">First name:</label> <input type="text" name="first_name" id="id_first_name" /></li>
+<li><ul class="errorlist"><li>This field is required.</li></ul><label for="id_last_name">Last name:</label> <input type="text" name="last_name" id="id_last_name" /></li>
+<li><ul class="errorlist"><li>This field is required.</li></ul><label for="id_birthday">Birthday:</label> <input type="text" name="birthday" id="id_birthday" /></li>
+>>> print p.as_p()
+<ul class="errorlist"><li>This field is required.</li></ul>
+<p><label for="id_first_name">First name:</label> <input type="text" name="first_name" id="id_first_name" /></p>
+<ul class="errorlist"><li>This field is required.</li></ul>
+<p><label for="id_last_name">Last name:</label> <input type="text" name="last_name" id="id_last_name" /></p>
+<ul class="errorlist"><li>This field is required.</li></ul>
+<p><label for="id_birthday">Birthday:</label> <input type="text" name="birthday" id="id_birthday" /></p>
+
+If you don't pass any values to the Form's __init__(), or if you pass None,
+the Form will be considered unbound and won't do any validation. Form.errors
+will be an empty dictionary *but* Form.is_valid() will return False.
+>>> p = Person()
+>>> p.is_bound
+False
+>>> p.errors
+{}
+>>> p.is_valid()
+False
+>>> p.cleaned_data
+Traceback (most recent call last):
+...
+AttributeError: 'Person' object has no attribute 'cleaned_data'
+>>> print p
+<tr><th><label for="id_first_name">First name:</label></th><td><input type="text" name="first_name" id="id_first_name" /></td></tr>
+<tr><th><label for="id_last_name">Last name:</label></th><td><input type="text" name="last_name" id="id_last_name" /></td></tr>
+<tr><th><label for="id_birthday">Birthday:</label></th><td><input type="text" name="birthday" id="id_birthday" /></td></tr>
+>>> print p.as_table()
+<tr><th><label for="id_first_name">First name:</label></th><td><input type="text" name="first_name" id="id_first_name" /></td></tr>
+<tr><th><label for="id_last_name">Last name:</label></th><td><input type="text" name="last_name" id="id_last_name" /></td></tr>
+<tr><th><label for="id_birthday">Birthday:</label></th><td><input type="text" name="birthday" id="id_birthday" /></td></tr>
+>>> print p.as_ul()
+<li><label for="id_first_name">First name:</label> <input type="text" name="first_name" id="id_first_name" /></li>
+<li><label for="id_last_name">Last name:</label> <input type="text" name="last_name" id="id_last_name" /></li>
+<li><label for="id_birthday">Birthday:</label> <input type="text" name="birthday" id="id_birthday" /></li>
+>>> print p.as_p()
+<p><label for="id_first_name">First name:</label> <input type="text" name="first_name" id="id_first_name" /></p>
+<p><label for="id_last_name">Last name:</label> <input type="text" name="last_name" id="id_last_name" /></p>
+<p><label for="id_birthday">Birthday:</label> <input type="text" name="birthday" id="id_birthday" /></p>
+
+Unicode values are handled properly.
+>>> p = Person({'first_name': u'John', 'last_name': u'\u0160\u0110\u0106\u017d\u0107\u017e\u0161\u0111', 'birthday': '1940-10-9'})
+>>> p.as_table()
+u'<tr><th><label for="id_first_name">First name:</label></th><td><input type="text" name="first_name" value="John" id="id_first_name" /></td></tr>\n<tr><th><label for="id_last_name">Last name:</label></th><td><input type="text" name="last_name" value="\u0160\u0110\u0106\u017d\u0107\u017e\u0161\u0111" id="id_last_name" /></td></tr>\n<tr><th><label for="id_birthday">Birthday:</label></th><td><input type="text" name="birthday" value="1940-10-9" id="id_birthday" /></td></tr>'
+>>> p.as_ul()
+u'<li><label for="id_first_name">First name:</label> <input type="text" name="first_name" value="John" id="id_first_name" /></li>\n<li><label for="id_last_name">Last name:</label> <input type="text" name="last_name" value="\u0160\u0110\u0106\u017d\u0107\u017e\u0161\u0111" id="id_last_name" /></li>\n<li><label for="id_birthday">Birthday:</label> <input type="text" name="birthday" value="1940-10-9" id="id_birthday" /></li>'
+>>> p.as_p()
+u'<p><label for="id_first_name">First name:</label> <input type="text" name="first_name" value="John" id="id_first_name" /></p>\n<p><label for="id_last_name">Last name:</label> <input type="text" name="last_name" value="\u0160\u0110\u0106\u017d\u0107\u017e\u0161\u0111" id="id_last_name" /></p>\n<p><label for="id_birthday">Birthday:</label> <input type="text" name="birthday" value="1940-10-9" id="id_birthday" /></p>'
+
+>>> p = Person({'last_name': u'Lennon'})
+>>> p.errors
+{'first_name': [u'This field is required.'], 'birthday': [u'This field is required.']}
+>>> p.is_valid()
+False
+>>> p.errors.as_ul()
+u'<ul class="errorlist"><li>first_name<ul class="errorlist"><li>This field is required.</li></ul></li><li>birthday<ul class="errorlist"><li>This field is required.</li></ul></li></ul>'
+>>> print p.errors.as_text()
+* first_name
+  * This field is required.
+* birthday
+  * This field is required.
+>>> p.cleaned_data
+Traceback (most recent call last):
+...
+AttributeError: 'Person' object has no attribute 'cleaned_data'
+>>> p['first_name'].errors
+[u'This field is required.']
+>>> p['first_name'].errors.as_ul()
+u'<ul class="errorlist"><li>This field is required.</li></ul>'
+>>> p['first_name'].errors.as_text()
+u'* This field is required.'
+
+>>> p = Person()
+>>> print p['first_name']
+<input type="text" name="first_name" id="id_first_name" />
+>>> print p['last_name']
+<input type="text" name="last_name" id="id_last_name" />
+>>> print p['birthday']
+<input type="text" name="birthday" id="id_birthday" />
+
+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 form constructor,
+but cleaned_data contains only the form's fields.
+>>> data = {'first_name': u'John', 'last_name': u'Lennon', 'birthday': u'1940-10-9', 'extra1': 'hello', 'extra2': 'hello'}
+>>> p = Person(data)
+>>> p.is_valid()
+True
+>>> p.cleaned_data
+{'first_name': u'John', 'last_name': u'Lennon', 'birthday': datetime.date(1940, 10, 9)}
+
+cleaned_data will include a key and value for *all* fields defined in the Form,
+even if the Form's 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. For CharFields, it's set to the
+empty string.
+>>> 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'}
+
+For DateFields, it's set to None.
+>>> class OptionalPersonForm(Form):
+...     first_name = CharField()
+...     last_name = CharField()
+...     birth_date = DateField(required=False)
+>>> data = {'first_name': u'John', 'last_name': u'Lennon'}
+>>> f = OptionalPersonForm(data)
+>>> f.is_valid()
+True
+>>> f.cleaned_data
+{'birth_date': None, 'first_name': u'John', 'last_name': u'Lennon'}
+
+"auto_id" tells the Form to add an "id" attribute to each form element.
+If it's a string that contains '%s', Django will use that as a format string
+into which the field's name will be inserted. It will also put a <label> around
+the human-readable labels for a field.
+>>> p = Person(auto_id='%s_id')
+>>> print p.as_table()
+<tr><th><label for="first_name_id">First name:</label></th><td><input type="text" name="first_name" id="first_name_id" /></td></tr>
+<tr><th><label for="last_name_id">Last name:</label></th><td><input type="text" name="last_name" id="last_name_id" /></td></tr>
+<tr><th><label for="birthday_id">Birthday:</label></th><td><input type="text" name="birthday" id="birthday_id" /></td></tr>
+>>> print p.as_ul()
+<li><label for="first_name_id">First name:</label> <input type="text" name="first_name" id="first_name_id" /></li>
+<li><label for="last_name_id">Last name:</label> <input type="text" name="last_name" id="last_name_id" /></li>
+<li><label for="birthday_id">Birthday:</label> <input type="text" name="birthday" id="birthday_id" /></li>
+>>> print p.as_p()
+<p><label for="first_name_id">First name:</label> <input type="text" name="first_name" id="first_name_id" /></p>
+<p><label for="last_name_id">Last name:</label> <input type="text" name="last_name" id="last_name_id" /></p>
+<p><label for="birthday_id">Birthday:</label> <input type="text" name="birthday" id="birthday_id" /></p>
+
+If auto_id is any True value whose str() does not contain '%s', the "id"
+attribute will be the name of the field.
+>>> p = Person(auto_id=True)
+>>> print p.as_ul()
+<li><label for="first_name">First name:</label> <input type="text" name="first_name" id="first_name" /></li>
+<li><label for="last_name">Last name:</label> <input type="text" name="last_name" id="last_name" /></li>
+<li><label for="birthday">Birthday:</label> <input type="text" name="birthday" id="birthday" /></li>
+
+If auto_id is any False value, an "id" attribute won't be output unless it
+was manually entered.
+>>> p = Person(auto_id=False)
+>>> print p.as_ul()
+<li>First name: <input type="text" name="first_name" /></li>
+<li>Last name: <input type="text" name="last_name" /></li>
+<li>Birthday: <input type="text" name="birthday" /></li>
+
+In this example, auto_id is False, but the "id" attribute for the "first_name"
+field is given. Also note that field gets a <label>, while the others don't.
+>>> class PersonNew(Form):
+...     first_name = CharField(widget=TextInput(attrs={'id': 'first_name_id'}))
+...     last_name = CharField()
+...     birthday = DateField()
+>>> p = PersonNew(auto_id=False)
+>>> print p.as_ul()
+<li><label for="first_name_id">First name:</label> <input type="text" id="first_name_id" name="first_name" /></li>
+<li>Last name: <input type="text" name="last_name" /></li>
+<li>Birthday: <input type="text" name="birthday" /></li>
+
+If the "id" attribute is specified in the Form and auto_id is True, the "id"
+attribute in the Form gets precedence.
+>>> p = PersonNew(auto_id=True)
+>>> print p.as_ul()
+<li><label for="first_name_id">First name:</label> <input type="text" id="first_name_id" name="first_name" /></li>
+<li><label for="last_name">Last name:</label> <input type="text" name="last_name" id="last_name" /></li>
+<li><label for="birthday">Birthday:</label> <input type="text" name="birthday" id="birthday" /></li>
+
+>>> class SignupForm(Form):
+...     email = EmailField()
+...     get_spam = BooleanField()
+>>> f = SignupForm(auto_id=False)
+>>> print f['email']
+<input type="text" name="email" />
+>>> print f['get_spam']
+<input type="checkbox" name="get_spam" />
+
+>>> f = SignupForm({'email': 'test@example.com', 'get_spam': True}, auto_id=False)
+>>> print f['email']
+<input type="text" name="email" value="test@example.com" />
+>>> print f['get_spam']
+<input checked="checked" type="checkbox" name="get_spam" />
+
+Any Field can have a Widget class passed to its constructor:
+>>> class ContactForm(Form):
+...     subject = CharField()
+...     message = CharField(widget=Textarea)
+>>> f = ContactForm(auto_id=False)
+>>> print f['subject']
+<input type="text" name="subject" />
+>>> print f['message']
+<textarea rows="10" cols="40" name="message"></textarea>
+
+as_textarea(), as_text() and as_hidden() are shortcuts for changing the output
+widget type:
+>>> f['subject'].as_textarea()
+u'<textarea rows="10" cols="40" name="subject"></textarea>'
+>>> f['message'].as_text()
+u'<input type="text" name="message" />'
+>>> f['message'].as_hidden()
+u'<input type="hidden" name="message" />'
+
+The 'widget' parameter to a Field can also be an instance:
+>>> class ContactForm(Form):
+...     subject = CharField()
+...     message = CharField(widget=Textarea(attrs={'rows': 80, 'cols': 20}))
+>>> f = ContactForm(auto_id=False)
+>>> print f['message']
+<textarea rows="80" cols="20" name="message"></textarea>
+
+Instance-level attrs are *not* carried over to as_textarea(), as_text() and
+as_hidden():
+>>> f['message'].as_text()
+u'<input type="text" name="message" />'
+>>> f = ContactForm({'subject': 'Hello', 'message': 'I love you.'}, auto_id=False)
+>>> f['subject'].as_textarea()
+u'<textarea rows="10" cols="40" name="subject">Hello</textarea>'
+>>> f['message'].as_text()
+u'<input type="text" name="message" value="I love you." />'
+>>> f['message'].as_hidden()
+u'<input type="hidden" name="message" value="I love you." />'
+
+For a form with a <select>, use ChoiceField:
+>>> class FrameworkForm(Form):
+...     name = CharField()
+...     language = ChoiceField(choices=[('P', 'Python'), ('J', 'Java')])
+>>> f = FrameworkForm(auto_id=False)
+>>> print f['language']
+<select name="language">
+<option value="P">Python</option>
+<option value="J">Java</option>
+</select>
+>>> f = FrameworkForm({'name': 'Django', 'language': 'P'}, auto_id=False)
+>>> print f['language']
+<select name="language">
+<option value="P" selected="selected">Python</option>
+<option value="J">Java</option>
+</select>
+
+A subtlety: If one of the choices' value is the empty string and the form is
+unbound, then the <option> for the empty-string choice will get selected="selected".
+>>> class FrameworkForm(Form):
+...     name = CharField()
+...     language = ChoiceField(choices=[('', '------'), ('P', 'Python'), ('J', 'Java')])
+>>> f = FrameworkForm(auto_id=False)
+>>> print f['language']
+<select name="language">
+<option value="" selected="selected">------</option>
+<option value="P">Python</option>
+<option value="J">Java</option>
+</select>
+
+You can specify widget attributes in the Widget constructor.
+>>> class FrameworkForm(Form):
+...     name = CharField()
+...     language = ChoiceField(choices=[('P', 'Python'), ('J', 'Java')], widget=Select(attrs={'class': 'foo'}))
+>>> f = FrameworkForm(auto_id=False)
+>>> print f['language']
+<select class="foo" name="language">
+<option value="P">Python</option>
+<option value="J">Java</option>
+</select>
+>>> f = FrameworkForm({'name': 'Django', 'language': 'P'}, auto_id=False)
+>>> print f['language']
+<select class="foo" name="language">
+<option value="P" selected="selected">Python</option>
+<option value="J">Java</option>
+</select>
+
+When passing a custom widget instance to ChoiceField, note that setting
+'choices' on the widget is meaningless. The widget will use the choices
+defined on the Field, not the ones defined on the Widget.
+>>> class FrameworkForm(Form):
+...     name = CharField()
+...     language = ChoiceField(choices=[('P', 'Python'), ('J', 'Java')], widget=Select(choices=[('R', 'Ruby'), ('P', 'Perl')], attrs={'class': 'foo'}))
+>>> f = FrameworkForm(auto_id=False)
+>>> print f['language']
+<select class="foo" name="language">
+<option value="P">Python</option>
+<option value="J">Java</option>
+</select>
+>>> f = FrameworkForm({'name': 'Django', 'language': 'P'}, auto_id=False)
+>>> print f['language']
+<select class="foo" name="language">
+<option value="P" selected="selected">Python</option>
+<option value="J">Java</option>
+</select>
+
+You can set a ChoiceField's choices after the fact.
+>>> class FrameworkForm(Form):
+...     name = CharField()
+...     language = ChoiceField()
+>>> f = FrameworkForm(auto_id=False)
+>>> print f['language']
+<select name="language">
+</select>
+>>> f.fields['language'].choices = [('P', 'Python'), ('J', 'Java')]
+>>> print f['language']
+<select name="language">
+<option value="P">Python</option>
+<option value="J">Java</option>
+</select>
+
+Add widget=RadioSelect to use that widget with a ChoiceField.
+>>> class FrameworkForm(Form):
+...     name = CharField()
+...     language = ChoiceField(choices=[('P', 'Python'), ('J', 'Java')], widget=RadioSelect)
+>>> f = FrameworkForm(auto_id=False)
+>>> print f['language']
+<ul>
+<li><label><input type="radio" name="language" value="P" /> Python</label></li>
+<li><label><input type="radio" name="language" value="J" /> Java</label></li>
+</ul>
+>>> print f
+<tr><th>Name:</th><td><input type="text" name="name" /></td></tr>
+<tr><th>Language:</th><td><ul>
+<li><label><input type="radio" name="language" value="P" /> Python</label></li>
+<li><label><input type="radio" name="language" value="J" /> Java</label></li>
+</ul></td></tr>
+>>> print f.as_ul()
+<li>Name: <input type="text" name="name" /></li>
+<li>Language: <ul>
+<li><label><input type="radio" name="language" value="P" /> Python</label></li>
+<li><label><input type="radio" name="language" value="J" /> Java</label></li>
+</ul></li>
+
+Regarding auto_id and <label>, RadioSelect is a special case. Each radio button
+gets a distinct ID, formed by appending an underscore plus the button's
+zero-based index.
+>>> f = FrameworkForm(auto_id='id_%s')
+>>> print f['language']
+<ul>
+<li><label><input type="radio" id="id_language_0" value="P" name="language" /> Python</label></li>
+<li><label><input type="radio" id="id_language_1" value="J" name="language" /> Java</label></li>
+</ul>
+
+When RadioSelect is used with auto_id, and the whole form is printed using
+either as_table() or as_ul(), the label for the RadioSelect will point to the
+ID of the *first* radio button.
+>>> print f
+<tr><th><label for="id_name">Name:</label></th><td><input type="text" name="name" id="id_name" /></td></tr>
+<tr><th><label for="id_language_0">Language:</label></th><td><ul>
+<li><label><input type="radio" id="id_language_0" value="P" name="language" /> Python</label></li>
+<li><label><input type="radio" id="id_language_1" value="J" name="language" /> Java</label></li>
+</ul></td></tr>
+>>> print f.as_ul()
+<li><label for="id_name">Name:</label> <input type="text" name="name" id="id_name" /></li>
+<li><label for="id_language_0">Language:</label> <ul>
+<li><label><input type="radio" id="id_language_0" value="P" name="language" /> Python</label></li>
+<li><label><input type="radio" id="id_language_1" value="J" name="language" /> Java</label></li>
+</ul></li>
+>>> print f.as_p()
+<p><label for="id_name">Name:</label> <input type="text" name="name" id="id_name" /></p>
+<p><label for="id_language_0">Language:</label> <ul>
+<li><label><input type="radio" id="id_language_0" value="P" name="language" /> Python</label></li>
+<li><label><input type="radio" id="id_language_1" value="J" name="language" /> Java</label></li>
+</ul></p>
+
+MultipleChoiceField is a special case, as its data is required to be a list:
+>>> class SongForm(Form):
+...     name = CharField()
+...     composers = MultipleChoiceField()
+>>> f = SongForm(auto_id=False)
+>>> print f['composers']
+<select multiple="multiple" name="composers">
+</select>
+>>> class SongForm(Form):
+...     name = CharField()
+...     composers = MultipleChoiceField(choices=[('J', 'John Lennon'), ('P', 'Paul McCartney')])
+>>> f = SongForm(auto_id=False)
+>>> print f['composers']
+<select multiple="multiple" name="composers">
+<option value="J">John Lennon</option>
+<option value="P">Paul McCartney</option>
+</select>
+>>> f = SongForm({'name': 'Yesterday', 'composers': ['P']}, auto_id=False)
+>>> print f['name']
+<input type="text" name="name" value="Yesterday" />
+>>> print f['composers']
+<select multiple="multiple" name="composers">
+<option value="J">John Lennon</option>
+<option value="P" selected="selected">Paul McCartney</option>
+</select>
+
+MultipleChoiceField rendered as_hidden() is a special case. Because it can
+have multiple values, its as_hidden() renders multiple <input type="hidden">
+tags.
+>>> f = SongForm({'name': 'Yesterday', 'composers': ['P']}, auto_id=False)
+>>> print f['composers'].as_hidden()
+<input type="hidden" name="composers" value="P" />
+>>> f = SongForm({'name': 'From Me To You', 'composers': ['P', 'J']}, auto_id=False)
+>>> print f['composers'].as_hidden()
+<input type="hidden" name="composers" value="P" />
+<input type="hidden" name="composers" value="J" />
+
+MultipleChoiceField can also be used with the CheckboxSelectMultiple widget.
+>>> class SongForm(Form):
+...     name = CharField()
+...     composers = MultipleChoiceField(choices=[('J', 'John Lennon'), ('P', 'Paul McCartney')], widget=CheckboxSelectMultiple)
+>>> f = SongForm(auto_id=False)
+>>> print f['composers']
+<ul>
+<li><label><input type="checkbox" name="composers" value="J" /> John Lennon</label></li>
+<li><label><input type="checkbox" name="composers" value="P" /> Paul McCartney</label></li>
+</ul>
+>>> f = SongForm({'composers': ['J']}, auto_id=False)
+>>> print f['composers']
+<ul>
+<li><label><input checked="checked" type="checkbox" name="composers" value="J" /> John Lennon</label></li>
+<li><label><input type="checkbox" name="composers" value="P" /> Paul McCartney</label></li>
+</ul>
+>>> f = SongForm({'composers': ['J', 'P']}, auto_id=False)
+>>> print f['composers']
+<ul>
+<li><label><input checked="checked" type="checkbox" name="composers" value="J" /> John Lennon</label></li>
+<li><label><input checked="checked" type="checkbox" name="composers" value="P" /> Paul McCartney</label></li>
+</ul>
+
+Regarding auto_id, CheckboxSelectMultiple is a special case. Each checkbox
+gets a distinct ID, formed by appending an underscore plus the checkbox's
+zero-based index.
+>>> f = SongForm(auto_id='%s_id')
+>>> print f['composers']
+<ul>
+<li><label><input type="checkbox" name="composers" value="J" id="composers_id_0" /> John Lennon</label></li>
+<li><label><input type="checkbox" name="composers" value="P" id="composers_id_1" /> Paul McCartney</label></li>
+</ul>
+
+Data for a MultipleChoiceField should be a list. QueryDict and MultiValueDict
+conveniently work with this.
+>>> data = {'name': 'Yesterday', 'composers': ['J', 'P']}
+>>> f = SongForm(data)
+>>> f.errors
+{}
+>>> from django.http import QueryDict
+>>> data = QueryDict('name=Yesterday&composers=J&composers=P')
+>>> f = SongForm(data)
+>>> f.errors
+{}
+>>> from django.utils.datastructures import MultiValueDict
+>>> data = MultiValueDict(dict(name=['Yesterday'], composers=['J', 'P']))
+>>> f = SongForm(data)
+>>> f.errors
+{}
+
+The MultipleHiddenInput widget renders multiple values as hidden fields.
+>>> class SongFormHidden(Form):
+...     name = CharField()
+...     composers = MultipleChoiceField(choices=[('J', 'John Lennon'), ('P', 'Paul McCartney')], widget=MultipleHiddenInput)
+>>> f = SongFormHidden(MultiValueDict(dict(name=['Yesterday'], composers=['J', 'P'])), auto_id=False)
+>>> print f.as_ul()
+<li>Name: <input type="text" name="name" value="Yesterday" /><input type="hidden" name="composers" value="J" />
+<input type="hidden" name="composers" value="P" /></li>
+
+When using CheckboxSelectMultiple, the framework expects a list of input and
+returns a list of input.
+>>> f = SongForm({'name': 'Yesterday'}, auto_id=False)
+>>> f.errors
+{'composers': [u'This field is required.']}
+>>> f = SongForm({'name': 'Yesterday', 'composers': ['J']}, auto_id=False)
+>>> f.errors
+{}
+>>> f.cleaned_data
+{'composers': [u'J'], 'name': u'Yesterday'}
+>>> f = SongForm({'name': 'Yesterday', 'composers': ['J', 'P']}, auto_id=False)
+>>> f.errors
+{}
+>>> f.cleaned_data
+{'composers': [u'J', u'P'], 'name': u'Yesterday'}
+
+Validation errors are HTML-escaped when output as HTML.
+>>> class EscapingForm(Form):
+...     special_name = CharField()
+...     def clean_special_name(self):
+...         raise ValidationError("Something's wrong with '%s'" % self.cleaned_data['special_name'])
+
+>>> f = EscapingForm({'special_name': "Nothing to escape"}, auto_id=False)
+>>> print f
+<tr><th>Special name:</th><td><ul class="errorlist"><li>Something&#39;s wrong with &#39;Nothing to escape&#39;</li></ul><input type="text" name="special_name" value="Nothing to escape" /></td></tr>
+>>> f = EscapingForm({'special_name': "Should escape < & > and <script>alert('xss')</script>"}, auto_id=False)
+>>> print f
+<tr><th>Special name:</th><td><ul class="errorlist"><li>Something&#39;s wrong with &#39;Should escape &lt; &amp; &gt; and &lt;script&gt;alert(&#39;xss&#39;)&lt;/script&gt;&#39;</li></ul><input type="text" name="special_name" value="Should escape &lt; &amp; &gt; and &lt;script&gt;alert(&#39;xss&#39;)&lt;/script&gt;" /></td></tr>
+
+""" + \
+r""" # [This concatenation is to keep the string below the jython's 32K limit].
+# Validating multiple fields in relation to another ###########################
+
+There are a couple of ways to do multiple-field validation. If you want the
+validation message to be associated with a particular field, implement the
+clean_XXX() method on the Form, where XXX is the field name. As in
+Field.clean(), the clean_XXX() method should return the cleaned value. In the
+clean_XXX() method, you have access to self.cleaned_data, which is a dictionary
+of all the data that has been cleaned *so far*, in order by the fields,
+including the current field (e.g., the field XXX if you're in clean_XXX()).
+>>> class UserRegistration(Form):
+...    username = CharField(max_length=10)
+...    password1 = CharField(widget=PasswordInput)
+...    password2 = CharField(widget=PasswordInput)
+...    def clean_password2(self):
+...        if self.cleaned_data.get('password1') and self.cleaned_data.get('password2') and self.cleaned_data['password1'] != self.cleaned_data['password2']:
+...            raise ValidationError(u'Please make sure your passwords match.')
+...        return self.cleaned_data['password2']
+>>> f = UserRegistration(auto_id=False)
+>>> f.errors
+{}
+>>> f = UserRegistration({}, auto_id=False)
+>>> f.errors
+{'username': [u'This field is required.'], 'password1': [u'This field is required.'], 'password2': [u'This field is required.']}
+>>> f = UserRegistration({'username': 'adrian', 'password1': 'foo', 'password2': 'bar'}, auto_id=False)
+>>> f.errors
+{'password2': [u'Please make sure your passwords match.']}
+>>> f = UserRegistration({'username': 'adrian', 'password1': 'foo', 'password2': 'foo'}, auto_id=False)
+>>> f.errors
+{}
+>>> f.cleaned_data
+{'username': u'adrian', 'password1': u'foo', 'password2': u'foo'}
+
+Another way of doing multiple-field validation is by implementing the
+Form's clean() method. If you do this, any ValidationError raised by that
+method will not be associated with a particular field; it will have a
+special-case association with the field named '__all__'.
+Note that in Form.clean(), you have access to self.cleaned_data, a dictionary of
+all the fields/values that have *not* raised a ValidationError. Also note
+Form.clean() is required to return a dictionary of all clean data.
+>>> class UserRegistration(Form):
+...    username = CharField(max_length=10)
+...    password1 = CharField(widget=PasswordInput)
+...    password2 = CharField(widget=PasswordInput)
+...    def clean(self):
+...        if self.cleaned_data.get('password1') and self.cleaned_data.get('password2') and self.cleaned_data['password1'] != self.cleaned_data['password2']:
+...            raise ValidationError(u'Please make sure your passwords match.')
+...        return self.cleaned_data
+>>> f = UserRegistration(auto_id=False)
+>>> f.errors
+{}
+>>> f = UserRegistration({}, auto_id=False)
+>>> print f.as_table()
+<tr><th>Username:</th><td><ul class="errorlist"><li>This field is required.</li></ul><input type="text" name="username" maxlength="10" /></td></tr>
+<tr><th>Password1:</th><td><ul class="errorlist"><li>This field is required.</li></ul><input type="password" name="password1" /></td></tr>
+<tr><th>Password2:</th><td><ul class="errorlist"><li>This field is required.</li></ul><input type="password" name="password2" /></td></tr>
+>>> f.errors
+{'username': [u'This field is required.'], 'password1': [u'This field is required.'], 'password2': [u'This field is required.']}
+>>> f = UserRegistration({'username': 'adrian', 'password1': 'foo', 'password2': 'bar'}, auto_id=False)
+>>> f.errors
+{'__all__': [u'Please make sure your passwords match.']}
+>>> print f.as_table()
+<tr><td colspan="2"><ul class="errorlist"><li>Please make sure your passwords match.</li></ul></td></tr>
+<tr><th>Username:</th><td><input type="text" name="username" value="adrian" maxlength="10" /></td></tr>
+<tr><th>Password1:</th><td><input type="password" name="password1" value="foo" /></td></tr>
+<tr><th>Password2:</th><td><input type="password" name="password2" value="bar" /></td></tr>
+>>> print f.as_ul()
+<li><ul class="errorlist"><li>Please make sure your passwords match.</li></ul></li>
+<li>Username: <input type="text" name="username" value="adrian" maxlength="10" /></li>
+<li>Password1: <input type="password" name="password1" value="foo" /></li>
+<li>Password2: <input type="password" name="password2" value="bar" /></li>
+>>> f = UserRegistration({'username': 'adrian', 'password1': 'foo', 'password2': 'foo'}, auto_id=False)
+>>> f.errors
+{}
+>>> f.cleaned_data
+{'username': u'adrian', 'password1': u'foo', 'password2': u'foo'}
+
+# Dynamic construction ########################################################
+
+It's possible to construct a Form dynamically by adding to the self.fields
+dictionary in __init__(). Don't forget to call Form.__init__() within the
+subclass' __init__().
+>>> class Person(Form):
+...     first_name = CharField()
+...     last_name = CharField()
+...     def __init__(self, *args, **kwargs):
+...         super(Person, self).__init__(*args, **kwargs)
+...         self.fields['birthday'] = DateField()
+>>> p = Person(auto_id=False)
+>>> print p
+<tr><th>First name:</th><td><input type="text" name="first_name" /></td></tr>
+<tr><th>Last name:</th><td><input type="text" name="last_name" /></td></tr>
+<tr><th>Birthday:</th><td><input type="text" name="birthday" /></td></tr>
+
+Instances of a dynamic Form do not persist fields from one Form instance to
+the next.
+>>> class MyForm(Form):
+...     def __init__(self, data=None, auto_id=False, field_list=[]):
+...         Form.__init__(self, data, auto_id=auto_id)
+...         for field in field_list:
+...             self.fields[field[0]] = field[1]
+>>> field_list = [('field1', CharField()), ('field2', CharField())]
+>>> my_form = MyForm(field_list=field_list)
+>>> print my_form
+<tr><th>Field1:</th><td><input type="text" name="field1" /></td></tr>
+<tr><th>Field2:</th><td><input type="text" name="field2" /></td></tr>
+>>> field_list = [('field3', CharField()), ('field4', CharField())]
+>>> my_form = MyForm(field_list=field_list)
+>>> print my_form
+<tr><th>Field3:</th><td><input type="text" name="field3" /></td></tr>
+<tr><th>Field4:</th><td><input type="text" name="field4" /></td></tr>
+
+>>> class MyForm(Form):
+...     default_field_1 = CharField()
+...     default_field_2 = CharField()
+...     def __init__(self, data=None, auto_id=False, field_list=[]):
+...         Form.__init__(self, data, auto_id=auto_id)
+...         for field in field_list:
+...             self.fields[field[0]] = field[1]
+>>> field_list = [('field1', CharField()), ('field2', CharField())]
+>>> my_form = MyForm(field_list=field_list)
+>>> print my_form
+<tr><th>Default field 1:</th><td><input type="text" name="default_field_1" /></td></tr>
+<tr><th>Default field 2:</th><td><input type="text" name="default_field_2" /></td></tr>
+<tr><th>Field1:</th><td><input type="text" name="field1" /></td></tr>
+<tr><th>Field2:</th><td><input type="text" name="field2" /></td></tr>
+>>> field_list = [('field3', CharField()), ('field4', CharField())]
+>>> my_form = MyForm(field_list=field_list)
+>>> print my_form
+<tr><th>Default field 1:</th><td><input type="text" name="default_field_1" /></td></tr>
+<tr><th>Default field 2:</th><td><input type="text" name="default_field_2" /></td></tr>
+<tr><th>Field3:</th><td><input type="text" name="field3" /></td></tr>
+<tr><th>Field4:</th><td><input type="text" name="field4" /></td></tr>
+
+Similarly, changes to field attributes do not persist from one Form instance
+to the next.
+>>> class Person(Form):
+...     first_name = CharField(required=False)
+...     last_name = CharField(required=False)
+...     def __init__(self, names_required=False, *args, **kwargs):
+...         super(Person, self).__init__(*args, **kwargs)
+...         if names_required:
+...             self.fields['first_name'].required = True
+...             self.fields['first_name'].widget.attrs['class'] = 'required'
+...             self.fields['last_name'].required = True
+...             self.fields['last_name'].widget.attrs['class'] = 'required'
+>>> f = Person(names_required=False)
+>>> f['first_name'].field.required, f['last_name'].field.required
+(False, False)
+>>> f['first_name'].field.widget.attrs, f['last_name'].field.widget.attrs
+({}, {})
+>>> f = Person(names_required=True)
+>>> f['first_name'].field.required, f['last_name'].field.required
+(True, True)
+>>> f['first_name'].field.widget.attrs, f['last_name'].field.widget.attrs
+({'class': 'required'}, {'class': 'required'})
+>>> f = Person(names_required=False)
+>>> f['first_name'].field.required, f['last_name'].field.required
+(False, False)
+>>> f['first_name'].field.widget.attrs, f['last_name'].field.widget.attrs
+({}, {})
+>>> class Person(Form):
+...     first_name = CharField(max_length=30)
+...     last_name = CharField(max_length=30)
+...     def __init__(self, name_max_length=None, *args, **kwargs):
+...         super(Person, self).__init__(*args, **kwargs)
+...         if name_max_length:
+...             self.fields['first_name'].max_length = name_max_length
+...             self.fields['last_name'].max_length = name_max_length
+>>> f = Person(name_max_length=None)
+>>> f['first_name'].field.max_length, f['last_name'].field.max_length
+(30, 30)
+>>> f = Person(name_max_length=20)
+>>> f['first_name'].field.max_length, f['last_name'].field.max_length
+(20, 20)
+>>> f = Person(name_max_length=None)
+>>> f['first_name'].field.max_length, f['last_name'].field.max_length
+(30, 30)
+
+HiddenInput widgets are displayed differently in the as_table(), as_ul()
+and as_p() output of a Form -- their verbose names are not displayed, and a
+separate row is not displayed. They're displayed in the last row of the
+form, directly after that row's form element.
+>>> class Person(Form):
+...     first_name = CharField()
+...     last_name = CharField()
+...     hidden_text = CharField(widget=HiddenInput)
+...     birthday = DateField()
+>>> p = Person(auto_id=False)
+>>> print p
+<tr><th>First name:</th><td><input type="text" name="first_name" /></td></tr>
+<tr><th>Last name:</th><td><input type="text" name="last_name" /></td></tr>
+<tr><th>Birthday:</th><td><input type="text" name="birthday" /><input type="hidden" name="hidden_text" /></td></tr>
+>>> print p.as_ul()
+<li>First name: <input type="text" name="first_name" /></li>
+<li>Last name: <input type="text" name="last_name" /></li>
+<li>Birthday: <input type="text" name="birthday" /><input type="hidden" name="hidden_text" /></li>
+>>> print p.as_p()
+<p>First name: <input type="text" name="first_name" /></p>
+<p>Last name: <input type="text" name="last_name" /></p>
+<p>Birthday: <input type="text" name="birthday" /><input type="hidden" name="hidden_text" /></p>
+
+With auto_id set, a HiddenInput still gets an ID, but it doesn't get a label.
+>>> p = Person(auto_id='id_%s')
+>>> print p
+<tr><th><label for="id_first_name">First name:</label></th><td><input type="text" name="first_name" id="id_first_name" /></td></tr>
+<tr><th><label for="id_last_name">Last name:</label></th><td><input type="text" name="last_name" id="id_last_name" /></td></tr>
+<tr><th><label for="id_birthday">Birthday:</label></th><td><input type="text" name="birthday" id="id_birthday" /><input type="hidden" name="hidden_text" id="id_hidden_text" /></td></tr>
+>>> print p.as_ul()
+<li><label for="id_first_name">First name:</label> <input type="text" name="first_name" id="id_first_name" /></li>
+<li><label for="id_last_name">Last name:</label> <input type="text" name="last_name" id="id_last_name" /></li>
+<li><label for="id_birthday">Birthday:</label> <input type="text" name="birthday" id="id_birthday" /><input type="hidden" name="hidden_text" id="id_hidden_text" /></li>
+>>> print p.as_p()
+<p><label for="id_first_name">First name:</label> <input type="text" name="first_name" id="id_first_name" /></p>
+<p><label for="id_last_name">Last name:</label> <input type="text" name="last_name" id="id_last_name" /></p>
+<p><label for="id_birthday">Birthday:</label> <input type="text" name="birthday" id="id_birthday" /><input type="hidden" name="hidden_text" id="id_hidden_text" /></p>
+
+If a field with a HiddenInput has errors, the as_table() and as_ul() output
+will include the error message(s) with the text "(Hidden field [fieldname]) "
+prepended. This message is displayed at the top of the output, regardless of
+its field's order in the form.
+>>> p = Person({'first_name': 'John', 'last_name': 'Lennon', 'birthday': '1940-10-9'}, auto_id=False)
+>>> print p
+<tr><td colspan="2"><ul class="errorlist"><li>(Hidden field hidden_text) This field is required.</li></ul></td></tr>
+<tr><th>First name:</th><td><input type="text" name="first_name" value="John" /></td></tr>
+<tr><th>Last name:</th><td><input type="text" name="last_name" value="Lennon" /></td></tr>
+<tr><th>Birthday:</th><td><input type="text" name="birthday" value="1940-10-9" /><input type="hidden" name="hidden_text" /></td></tr>
+>>> print p.as_ul()
+<li><ul class="errorlist"><li>(Hidden field hidden_text) This field is required.</li></ul></li>
+<li>First name: <input type="text" name="first_name" value="John" /></li>
+<li>Last name: <input type="text" name="last_name" value="Lennon" /></li>
+<li>Birthday: <input type="text" name="birthday" value="1940-10-9" /><input type="hidden" name="hidden_text" /></li>
+>>> print p.as_p()
+<ul class="errorlist"><li>(Hidden field hidden_text) This field is required.</li></ul>
+<p>First name: <input type="text" name="first_name" value="John" /></p>
+<p>Last name: <input type="text" name="last_name" value="Lennon" /></p>
+<p>Birthday: <input type="text" name="birthday" value="1940-10-9" /><input type="hidden" name="hidden_text" /></p>
+
+A corner case: It's possible for a form to have only HiddenInputs.
+>>> class TestForm(Form):
+...     foo = CharField(widget=HiddenInput)
+...     bar = CharField(widget=HiddenInput)
+>>> p = TestForm(auto_id=False)
+>>> print p.as_table()
+<input type="hidden" name="foo" /><input type="hidden" name="bar" />
+>>> print p.as_ul()
+<input type="hidden" name="foo" /><input type="hidden" name="bar" />
+>>> print p.as_p()
+<input type="hidden" name="foo" /><input type="hidden" name="bar" />
+
+A Form's fields are displayed in the same order in which they were defined.
+>>> class TestForm(Form):
+...     field1 = CharField()
+...     field2 = CharField()
+...     field3 = CharField()
+...     field4 = CharField()
+...     field5 = CharField()
+...     field6 = CharField()
+...     field7 = CharField()
+...     field8 = CharField()
+...     field9 = CharField()
+...     field10 = CharField()
+...     field11 = CharField()
+...     field12 = CharField()
+...     field13 = CharField()
+...     field14 = CharField()
+>>> p = TestForm(auto_id=False)
+>>> print p
+<tr><th>Field1:</th><td><input type="text" name="field1" /></td></tr>
+<tr><th>Field2:</th><td><input type="text" name="field2" /></td></tr>
+<tr><th>Field3:</th><td><input type="text" name="field3" /></td></tr>
+<tr><th>Field4:</th><td><input type="text" name="field4" /></td></tr>
+<tr><th>Field5:</th><td><input type="text" name="field5" /></td></tr>
+<tr><th>Field6:</th><td><input type="text" name="field6" /></td></tr>
+<tr><th>Field7:</th><td><input type="text" name="field7" /></td></tr>
+<tr><th>Field8:</th><td><input type="text" name="field8" /></td></tr>
+<tr><th>Field9:</th><td><input type="text" name="field9" /></td></tr>
+<tr><th>Field10:</th><td><input type="text" name="field10" /></td></tr>
+<tr><th>Field11:</th><td><input type="text" name="field11" /></td></tr>
+<tr><th>Field12:</th><td><input type="text" name="field12" /></td></tr>
+<tr><th>Field13:</th><td><input type="text" name="field13" /></td></tr>
+<tr><th>Field14:</th><td><input type="text" name="field14" /></td></tr>
+
+Some Field classes have an effect on the HTML attributes of their associated
+Widget. If you set max_length in a CharField and its associated widget is
+either a TextInput or PasswordInput, then the widget's rendered HTML will
+include the "maxlength" attribute.
+>>> class UserRegistration(Form):
+...    username = CharField(max_length=10)                   # uses TextInput by default
+...    password = CharField(max_length=10, widget=PasswordInput)
+...    realname = CharField(max_length=10, widget=TextInput) # redundantly define widget, just to test
+...    address = CharField()                                 # no max_length defined here
+>>> p = UserRegistration(auto_id=False)
+>>> print p.as_ul()
+<li>Username: <input type="text" name="username" maxlength="10" /></li>
+<li>Password: <input type="password" name="password" maxlength="10" /></li>
+<li>Realname: <input type="text" name="realname" maxlength="10" /></li>
+<li>Address: <input type="text" name="address" /></li>
+
+If you specify a custom "attrs" that includes the "maxlength" attribute,
+the Field's max_length attribute will override whatever "maxlength" you specify
+in "attrs".
+>>> class UserRegistration(Form):
+...    username = CharField(max_length=10, widget=TextInput(attrs={'maxlength': 20}))
+...    password = CharField(max_length=10, widget=PasswordInput)
+>>> p = UserRegistration(auto_id=False)
+>>> print p.as_ul()
+<li>Username: <input type="text" name="username" maxlength="10" /></li>
+<li>Password: <input type="password" name="password" maxlength="10" /></li>
+
+# Specifying labels ###########################################################
+
+You can specify the label for a field by using the 'label' argument to a Field
+class. If you don't specify 'label', Django will use the field name with
+underscores converted to spaces, and the initial letter capitalized.
+>>> class UserRegistration(Form):
+...    username = CharField(max_length=10, label='Your username')
+...    password1 = CharField(widget=PasswordInput)
+...    password2 = CharField(widget=PasswordInput, label='Password (again)')
+>>> p = UserRegistration(auto_id=False)
+>>> print p.as_ul()
+<li>Your username: <input type="text" name="username" maxlength="10" /></li>
+<li>Password1: <input type="password" name="password1" /></li>
+<li>Password (again): <input type="password" name="password2" /></li>
+
+Labels for as_* methods will only end in a colon if they don't end in other
+punctuation already.
+>>> class Questions(Form):
+...    q1 = CharField(label='The first question')
+...    q2 = CharField(label='What is your name?')
+...    q3 = CharField(label='The answer to life is:')
+...    q4 = CharField(label='Answer this question!')
+...    q5 = CharField(label='The last question. Period.')
+>>> print Questions(auto_id=False).as_p()
+<p>The first question: <input type="text" name="q1" /></p>
+<p>What is your name? <input type="text" name="q2" /></p>
+<p>The answer to life is: <input type="text" name="q3" /></p>
+<p>Answer this question! <input type="text" name="q4" /></p>
+<p>The last question. Period. <input type="text" name="q5" /></p>
+>>> print Questions().as_p()
+<p><label for="id_q1">The first question:</label> <input type="text" name="q1" id="id_q1" /></p>
+<p><label for="id_q2">What is your name?</label> <input type="text" name="q2" id="id_q2" /></p>
+<p><label for="id_q3">The answer to life is:</label> <input type="text" name="q3" id="id_q3" /></p>
+<p><label for="id_q4">Answer this question!</label> <input type="text" name="q4" id="id_q4" /></p>
+<p><label for="id_q5">The last question. Period.</label> <input type="text" name="q5" id="id_q5" /></p>
+
+A label can be a Unicode object or a bytestring with special characters.
+>>> class UserRegistration(Form):
+...    username = CharField(max_length=10, label='ŠĐĆŽćžšđ')
+...    password = CharField(widget=PasswordInput, label=u'\u0160\u0110\u0106\u017d\u0107\u017e\u0161\u0111')
+>>> p = UserRegistration(auto_id=False)
+>>> p.as_ul()
+u'<li>\u0160\u0110\u0106\u017d\u0107\u017e\u0161\u0111: <input type="text" name="username" maxlength="10" /></li>\n<li>\u0160\u0110\u0106\u017d\u0107\u017e\u0161\u0111: <input type="password" name="password" /></li>'
+
+If a label is set to the empty string for a field, that field won't get a label.
+>>> class UserRegistration(Form):
+...    username = CharField(max_length=10, label='')
+...    password = CharField(widget=PasswordInput)
+>>> p = UserRegistration(auto_id=False)
+>>> print p.as_ul()
+<li> <input type="text" name="username" maxlength="10" /></li>
+<li>Password: <input type="password" name="password" /></li>
+>>> p = UserRegistration(auto_id='id_%s')
+>>> print p.as_ul()
+<li> <input id="id_username" type="text" name="username" maxlength="10" /></li>
+<li><label for="id_password">Password:</label> <input type="password" name="password" id="id_password" /></li>
+
+If label is None, Django will auto-create the label from the field name. This
+is default behavior.
+>>> class UserRegistration(Form):
+...    username = CharField(max_length=10, label=None)
+...    password = CharField(widget=PasswordInput)
+>>> p = UserRegistration(auto_id=False)
+>>> print p.as_ul()
+<li>Username: <input type="text" name="username" maxlength="10" /></li>
+<li>Password: <input type="password" name="password" /></li>
+>>> p = UserRegistration(auto_id='id_%s')
+>>> print p.as_ul()
+<li><label for="id_username">Username:</label> <input id="id_username" type="text" name="username" maxlength="10" /></li>
+<li><label for="id_password">Password:</label> <input type="password" name="password" id="id_password" /></li>
+
+
+# Label Suffix ################################################################
+
+You can specify the 'label_suffix' argument to a Form class to modify the
+punctuation symbol used at the end of a label.  By default, the colon (:) is
+used, and is only appended to the label if the label doesn't already end with a
+punctuation symbol: ., !, ? or :.  If you specify a different suffix, it will
+be appended regardless of the last character of the label.
+
+>>> class FavoriteForm(Form):
+...     color = CharField(label='Favorite color?')
+...     animal = CharField(label='Favorite animal')
+...
+>>> f = FavoriteForm(auto_id=False)
+>>> print f.as_ul()
+<li>Favorite color? <input type="text" name="color" /></li>
+<li>Favorite animal: <input type="text" name="animal" /></li>
+>>> f = FavoriteForm(auto_id=False, label_suffix='?')
+>>> print f.as_ul()
+<li>Favorite color? <input type="text" name="color" /></li>
+<li>Favorite animal? <input type="text" name="animal" /></li>
+>>> f = FavoriteForm(auto_id=False, label_suffix='')
+>>> print f.as_ul()
+<li>Favorite color? <input type="text" name="color" /></li>
+<li>Favorite animal <input type="text" name="animal" /></li>
+>>> f = FavoriteForm(auto_id=False, label_suffix=u'\u2192')
+>>> f.as_ul()
+u'<li>Favorite color? <input type="text" name="color" /></li>\n<li>Favorite animal\u2192 <input type="text" name="animal" /></li>'
+
+""" + \
+r""" # [This concatenation is to keep the string below the jython's 32K limit].
+
+# Initial data ################################################################
+
+You can specify initial data for a field by using the 'initial' argument to a
+Field class. This initial data is displayed when a Form is rendered with *no*
+data. It is not displayed when a Form is rendered with any data (including an
+empty dictionary). Also, the initial value is *not* used if data for a
+particular required field isn't provided.
+>>> class UserRegistration(Form):
+...    username = CharField(max_length=10, initial='django')
+...    password = CharField(widget=PasswordInput)
+
+Here, we're not submitting any data, so the initial value will be displayed.
+>>> p = UserRegistration(auto_id=False)
+>>> print p.as_ul()
+<li>Username: <input type="text" name="username" value="django" maxlength="10" /></li>
+<li>Password: <input type="password" name="password" /></li>
+
+Here, we're submitting data, so the initial value will *not* be displayed.
+>>> p = UserRegistration({}, auto_id=False)
+>>> print p.as_ul()
+<li><ul class="errorlist"><li>This field is required.</li></ul>Username: <input type="text" name="username" maxlength="10" /></li>
+<li><ul class="errorlist"><li>This field is required.</li></ul>Password: <input type="password" name="password" /></li>
+>>> p = UserRegistration({'username': u''}, auto_id=False)
+>>> print p.as_ul()
+<li><ul class="errorlist"><li>This field is required.</li></ul>Username: <input type="text" name="username" maxlength="10" /></li>
+<li><ul class="errorlist"><li>This field is required.</li></ul>Password: <input type="password" name="password" /></li>
+>>> p = UserRegistration({'username': u'foo'}, auto_id=False)
+>>> print p.as_ul()
+<li>Username: <input type="text" name="username" value="foo" maxlength="10" /></li>
+<li><ul class="errorlist"><li>This field is required.</li></ul>Password: <input type="password" name="password" /></li>
+
+An 'initial' value is *not* used as a fallback if data is not provided. In this
+example, we don't provide a value for 'username', and the form raises a
+validation error rather than using the initial value for 'username'.
+>>> p = UserRegistration({'password': 'secret'})
+>>> p.errors
+{'username': [u'This field is required.']}
+>>> p.is_valid()
+False
+
+# Dynamic initial data ########################################################
+
+The previous technique dealt with "hard-coded" initial data, but it's also
+possible to specify initial data after you've already created the Form class
+(i.e., at runtime). Use the 'initial' parameter to the Form constructor. This
+should be a dictionary containing initial values for one or more fields in the
+form, keyed by field name.
+
+>>> class UserRegistration(Form):
+...    username = CharField(max_length=10)
+...    password = CharField(widget=PasswordInput)
+
+Here, we're not submitting any data, so the initial value will be displayed.
+>>> p = UserRegistration(initial={'username': 'django'}, auto_id=False)
+>>> print p.as_ul()
+<li>Username: <input type="text" name="username" value="django" maxlength="10" /></li>
+<li>Password: <input type="password" name="password" /></li>
+>>> p = UserRegistration(initial={'username': 'stephane'}, auto_id=False)
+>>> print p.as_ul()
+<li>Username: <input type="text" name="username" value="stephane" maxlength="10" /></li>
+<li>Password: <input type="password" name="password" /></li>
+
+The 'initial' parameter is meaningless if you pass data.
+>>> p = UserRegistration({}, initial={'username': 'django'}, auto_id=False)
+>>> print p.as_ul()
+<li><ul class="errorlist"><li>This field is required.</li></ul>Username: <input type="text" name="username" maxlength="10" /></li>
+<li><ul class="errorlist"><li>This field is required.</li></ul>Password: <input type="password" name="password" /></li>
+>>> p = UserRegistration({'username': u''}, initial={'username': 'django'}, auto_id=False)
+>>> print p.as_ul()
+<li><ul class="errorlist"><li>This field is required.</li></ul>Username: <input type="text" name="username" maxlength="10" /></li>
+<li><ul class="errorlist"><li>This field is required.</li></ul>Password: <input type="password" name="password" /></li>
+>>> p = UserRegistration({'username': u'foo'}, initial={'username': 'django'}, auto_id=False)
+>>> print p.as_ul()
+<li>Username: <input type="text" name="username" value="foo" maxlength="10" /></li>
+<li><ul class="errorlist"><li>This field is required.</li></ul>Password: <input type="password" name="password" /></li>
+
+A dynamic 'initial' value is *not* used as a fallback if data is not provided.
+In this example, we don't provide a value for 'username', and the form raises a
+validation error rather than using the initial value for 'username'.
+>>> p = UserRegistration({'password': 'secret'}, initial={'username': 'django'})
+>>> p.errors
+{'username': [u'This field is required.']}
+>>> p.is_valid()
+False
+
+If a Form defines 'initial' *and* 'initial' is passed as a parameter to Form(),
+then the latter will get precedence.
+>>> class UserRegistration(Form):
+...    username = CharField(max_length=10, initial='django')
+...    password = CharField(widget=PasswordInput)
+>>> p = UserRegistration(initial={'username': 'babik'}, auto_id=False)
+>>> print p.as_ul()
+<li>Username: <input type="text" name="username" value="babik" maxlength="10" /></li>
+<li>Password: <input type="password" name="password" /></li>
+
+# Callable initial data ########################################################
+
+The previous technique dealt with raw values as initial data, but it's also
+possible to specify callable data.
+
+>>> class UserRegistration(Form):
+...    username = CharField(max_length=10)
+...    password = CharField(widget=PasswordInput)
+
+We need to define functions that get called later.
+>>> def initial_django():
+...     return 'django'
+>>> def initial_stephane():
+...     return 'stephane'
+
+Here, we're not submitting any data, so the initial value will be displayed.
+>>> p = UserRegistration(initial={'username': initial_django}, auto_id=False)
+>>> print p.as_ul()
+<li>Username: <input type="text" name="username" value="django" maxlength="10" /></li>
+<li>Password: <input type="password" name="password" /></li>
+
+The 'initial' parameter is meaningless if you pass data.
+>>> p = UserRegistration({}, initial={'username': initial_django}, auto_id=False)
+>>> print p.as_ul()
+<li><ul class="errorlist"><li>This field is required.</li></ul>Username: <input type="text" name="username" maxlength="10" /></li>
+<li><ul class="errorlist"><li>This field is required.</li></ul>Password: <input type="password" name="password" /></li>
+>>> p = UserRegistration({'username': u''}, initial={'username': initial_django}, auto_id=False)
+>>> print p.as_ul()
+<li><ul class="errorlist"><li>This field is required.</li></ul>Username: <input type="text" name="username" maxlength="10" /></li>
+<li><ul class="errorlist"><li>This field is required.</li></ul>Password: <input type="password" name="password" /></li>
+>>> p = UserRegistration({'username': u'foo'}, initial={'username': initial_django}, auto_id=False)
+>>> print p.as_ul()
+<li>Username: <input type="text" name="username" value="foo" maxlength="10" /></li>
+<li><ul class="errorlist"><li>This field is required.</li></ul>Password: <input type="password" name="password" /></li>
+
+A callable 'initial' value is *not* used as a fallback if data is not provided.
+In this example, we don't provide a value for 'username', and the form raises a
+validation error rather than using the initial value for 'username'.
+>>> p = UserRegistration({'password': 'secret'}, initial={'username': initial_django})
+>>> p.errors
+{'username': [u'This field is required.']}
+>>> p.is_valid()
+False
+
+If a Form defines 'initial' *and* 'initial' is passed as a parameter to Form(),
+then the latter will get precedence.
+>>> class UserRegistration(Form):
+...    username = CharField(max_length=10, initial=initial_django)
+...    password = CharField(widget=PasswordInput)
+>>> p = UserRegistration(auto_id=False)
+>>> print p.as_ul()
+<li>Username: <input type="text" name="username" value="django" maxlength="10" /></li>
+<li>Password: <input type="password" name="password" /></li>
+>>> p = UserRegistration(initial={'username': initial_stephane}, auto_id=False)
+>>> print p.as_ul()
+<li>Username: <input type="text" name="username" value="stephane" maxlength="10" /></li>
+<li>Password: <input type="password" name="password" /></li>
+
+# Help text ###################################################################
+
+You can specify descriptive text for a field by using the 'help_text' argument
+to a Field class. This help text is displayed when a Form is rendered.
+>>> class UserRegistration(Form):
+...    username = CharField(max_length=10, help_text='e.g., user@example.com')
+...    password = CharField(widget=PasswordInput, help_text='Choose wisely.')
+>>> p = UserRegistration(auto_id=False)
+>>> print p.as_ul()
+<li>Username: <input type="text" name="username" maxlength="10" /> e.g., user@example.com</li>
+<li>Password: <input type="password" name="password" /> Choose wisely.</li>
+>>> print p.as_p()
+<p>Username: <input type="text" name="username" maxlength="10" /> e.g., user@example.com</p>
+<p>Password: <input type="password" name="password" /> Choose wisely.</p>
+>>> print p.as_table()
+<tr><th>Username:</th><td><input type="text" name="username" maxlength="10" /><br />e.g., user@example.com</td></tr>
+<tr><th>Password:</th><td><input type="password" name="password" /><br />Choose wisely.</td></tr>
+
+The help text is displayed whether or not data is provided for the form.
+>>> p = UserRegistration({'username': u'foo'}, auto_id=False)
+>>> print p.as_ul()
+<li>Username: <input type="text" name="username" value="foo" maxlength="10" /> e.g., user@example.com</li>
+<li><ul class="errorlist"><li>This field is required.</li></ul>Password: <input type="password" name="password" /> Choose wisely.</li>
+
+help_text is not displayed for hidden fields. It can be used for documentation
+purposes, though.
+>>> class UserRegistration(Form):
+...    username = CharField(max_length=10, help_text='e.g., user@example.com')
+...    password = CharField(widget=PasswordInput)
+...    next = CharField(widget=HiddenInput, initial='/', help_text='Redirect destination')
+>>> p = UserRegistration(auto_id=False)
+>>> print p.as_ul()
+<li>Username: <input type="text" name="username" maxlength="10" /> e.g., user@example.com</li>
+<li>Password: <input type="password" name="password" /><input type="hidden" name="next" value="/" /></li>
+
+Help text can include arbitrary Unicode characters.
+>>> class UserRegistration(Form):
+...    username = CharField(max_length=10, help_text='ŠĐĆŽćžšđ')
+>>> p = UserRegistration(auto_id=False)
+>>> p.as_ul()
+u'<li>Username: <input type="text" name="username" maxlength="10" /> \u0160\u0110\u0106\u017d\u0107\u017e\u0161\u0111</li>'
+
+# Subclassing forms ###########################################################
+
+You can subclass a Form to add fields. The resulting form subclass will have
+all of the fields of the parent Form, plus whichever fields you define in the
+subclass.
+>>> class Person(Form):
+...     first_name = CharField()
+...     last_name = CharField()
+...     birthday = DateField()
+>>> class Musician(Person):
+...     instrument = CharField()
+>>> p = Person(auto_id=False)
+>>> print p.as_ul()
+<li>First name: <input type="text" name="first_name" /></li>
+<li>Last name: <input type="text" name="last_name" /></li>
+<li>Birthday: <input type="text" name="birthday" /></li>
+>>> m = Musician(auto_id=False)
+>>> print m.as_ul()
+<li>First name: <input type="text" name="first_name" /></li>
+<li>Last name: <input type="text" name="last_name" /></li>
+<li>Birthday: <input type="text" name="birthday" /></li>
+<li>Instrument: <input type="text" name="instrument" /></li>
+
+Yes, you can subclass multiple forms. The fields are added in the order in
+which the parent classes are listed.
+>>> class Person(Form):
+...     first_name = CharField()
+...     last_name = CharField()
+...     birthday = DateField()
+>>> class Instrument(Form):
+...     instrument = CharField()
+>>> class Beatle(Person, Instrument):
+...     haircut_type = CharField()
+>>> b = Beatle(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>Birthday: <input type="text" name="birthday" /></li>
+<li>Instrument: <input type="text" name="instrument" /></li>
+<li>Haircut type: <input type="text" name="haircut_type" /></li>
+
+# Forms with prefixes #########################################################
+
+Sometimes it's necessary to have multiple forms display on the same HTML page,
+or multiple copies of the same form. We can accomplish this with form prefixes.
+Pass the keyword argument 'prefix' to the Form constructor to use this feature.
+This value will be prepended to each HTML form field name. One way to think
+about this is "namespaces for HTML forms". Notice that in the data argument,
+each field's key has the prefix, in this case 'person1', prepended to the
+actual field name.
+>>> class Person(Form):
+...     first_name = CharField()
+...     last_name = CharField()
+...     birthday = DateField()
+>>> data = {
+...     'person1-first_name': u'John',
+...     'person1-last_name': u'Lennon',
+...     'person1-birthday': u'1940-10-9'
+... }
+>>> p = Person(data, prefix='person1')
+>>> print p.as_ul()
+<li><label for="id_person1-first_name">First name:</label> <input type="text" name="person1-first_name" value="John" id="id_person1-first_name" /></li>
+<li><label for="id_person1-last_name">Last name:</label> <input type="text" name="person1-last_name" value="Lennon" id="id_person1-last_name" /></li>
+<li><label for="id_person1-birthday">Birthday:</label> <input type="text" name="person1-birthday" value="1940-10-9" id="id_person1-birthday" /></li>
+>>> print p['first_name']
+<input type="text" name="person1-first_name" value="John" id="id_person1-first_name" />
+>>> print p['last_name']
+<input type="text" name="person1-last_name" value="Lennon" id="id_person1-last_name" />
+>>> print p['birthday']
+<input type="text" name="person1-birthday" value="1940-10-9" id="id_person1-birthday" />
+>>> p.errors
+{}
+>>> p.is_valid()
+True
+>>> p.cleaned_data
+{'first_name': u'John', 'last_name': u'Lennon', 'birthday': datetime.date(1940, 10, 9)}
+
+Let's try submitting some bad data to make sure form.errors and field.errors
+work as expected.
+>>> data = {
+...     'person1-first_name': u'',
+...     'person1-last_name': u'',
+...     'person1-birthday': u''
+... }
+>>> p = Person(data, prefix='person1')
+>>> p.errors
+{'first_name': [u'This field is required.'], 'last_name': [u'This field is required.'], 'birthday': [u'This field is required.']}
+>>> p['first_name'].errors
+[u'This field is required.']
+>>> p['person1-first_name'].errors
+Traceback (most recent call last):
+...
+KeyError: "Key 'person1-first_name' not found in Form"
+
+In this example, the data doesn't have a prefix, but the form requires it, so
+the form doesn't "see" the fields.
+>>> data = {
+...     'first_name': u'John',
+...     'last_name': u'Lennon',
+...     'birthday': u'1940-10-9'
+... }
+>>> p = Person(data, prefix='person1')
+>>> p.errors
+{'first_name': [u'This field is required.'], 'last_name': [u'This field is required.'], 'birthday': [u'This field is required.']}
+
+With prefixes, a single data dictionary can hold data for multiple instances
+of the same form.
+>>> data = {
+...     'person1-first_name': u'John',
+...     'person1-last_name': u'Lennon',
+...     'person1-birthday': u'1940-10-9',
+...     'person2-first_name': u'Jim',
+...     'person2-last_name': u'Morrison',
+...     'person2-birthday': u'1943-12-8'
+... }
+>>> p1 = Person(data, prefix='person1')
+>>> p1.is_valid()
+True
+>>> p1.cleaned_data
+{'first_name': u'John', 'last_name': u'Lennon', 'birthday': datetime.date(1940, 10, 9)}
+>>> p2 = Person(data, prefix='person2')
+>>> p2.is_valid()
+True
+>>> p2.cleaned_data
+{'first_name': u'Jim', 'last_name': u'Morrison', 'birthday': datetime.date(1943, 12, 8)}
+
+By default, forms append a hyphen between the prefix and the field name, but a
+form can alter that behavior by implementing the add_prefix() method. This
+method takes a field name and returns the prefixed field, according to
+self.prefix.
+>>> class Person(Form):
+...     first_name = CharField()
+...     last_name = CharField()
+...     birthday = DateField()
+...     def add_prefix(self, field_name):
+...         return self.prefix and '%s-prefix-%s' % (self.prefix, field_name) or field_name
+>>> p = Person(prefix='foo')
+>>> print p.as_ul()
+<li><label for="id_foo-prefix-first_name">First name:</label> <input type="text" name="foo-prefix-first_name" id="id_foo-prefix-first_name" /></li>
+<li><label for="id_foo-prefix-last_name">Last name:</label> <input type="text" name="foo-prefix-last_name" id="id_foo-prefix-last_name" /></li>
+<li><label for="id_foo-prefix-birthday">Birthday:</label> <input type="text" name="foo-prefix-birthday" id="id_foo-prefix-birthday" /></li>
+>>> data = {
+...     'foo-prefix-first_name': u'John',
+...     'foo-prefix-last_name': u'Lennon',
+...     'foo-prefix-birthday': u'1940-10-9'
+... }
+>>> p = Person(data, prefix='foo')
+>>> p.is_valid()
+True
+>>> p.cleaned_data
+{'first_name': u'John', 'last_name': u'Lennon', 'birthday': datetime.date(1940, 10, 9)}
+
+# Forms with NullBooleanFields ################################################
+
+NullBooleanField is a bit of a special case because its presentation (widget)
+is different than its data. This is handled transparently, though.
+
+>>> class Person(Form):
+...     name = CharField()
+...     is_cool = NullBooleanField()
+>>> p = Person({'name': u'Joe'}, auto_id=False)
+>>> print p['is_cool']
+<select name="is_cool">
+<option value="1" selected="selected">Unknown</option>
+<option value="2">Yes</option>
+<option value="3">No</option>
+</select>
+>>> p = Person({'name': u'Joe', 'is_cool': u'1'}, auto_id=False)
+>>> print p['is_cool']
+<select name="is_cool">
+<option value="1" selected="selected">Unknown</option>
+<option value="2">Yes</option>
+<option value="3">No</option>
+</select>
+>>> p = Person({'name': u'Joe', 'is_cool': u'2'}, auto_id=False)
+>>> print p['is_cool']
+<select name="is_cool">
+<option value="1">Unknown</option>
+<option value="2" selected="selected">Yes</option>
+<option value="3">No</option>
+</select>
+>>> p = Person({'name': u'Joe', 'is_cool': u'3'}, auto_id=False)
+>>> print p['is_cool']
+<select name="is_cool">
+<option value="1">Unknown</option>
+<option value="2">Yes</option>
+<option value="3" selected="selected">No</option>
+</select>
+>>> p = Person({'name': u'Joe', 'is_cool': True}, auto_id=False)
+>>> print p['is_cool']
+<select name="is_cool">
+<option value="1">Unknown</option>
+<option value="2" selected="selected">Yes</option>
+<option value="3">No</option>
+</select>
+>>> p = Person({'name': u'Joe', 'is_cool': False}, auto_id=False)
+>>> print p['is_cool']
+<select name="is_cool">
+<option value="1">Unknown</option>
+<option value="2">Yes</option>
+<option value="3" selected="selected">No</option>
+</select>
+
+# Forms with FileFields ################################################
+
+FileFields are a special case because they take their data from the request.FILES,
+not request.POST.
+
+>>> class FileForm(Form):
+...     file1 = FileField()
+>>> f = FileForm(auto_id=False)
+>>> print f
+<tr><th>File1:</th><td><input type="file" name="file1" /></td></tr>
+
+>>> f = FileForm(data={}, files={}, auto_id=False)
+>>> print f
+<tr><th>File1:</th><td><ul class="errorlist"><li>This field is required.</li></ul><input type="file" name="file1" /></td></tr>
+
+>>> f = FileForm(data={}, files={'file1': {'filename': 'name', 'content':''}}, auto_id=False)
+>>> print f
+<tr><th>File1:</th><td><ul class="errorlist"><li>The submitted file is empty.</li></ul><input type="file" name="file1" /></td></tr>
+
+>>> f = FileForm(data={}, files={'file1': 'something that is not a file'}, auto_id=False)
+>>> print f
+<tr><th>File1:</th><td><ul class="errorlist"><li>No file was submitted. Check the encoding type on the form.</li></ul><input type="file" name="file1" /></td></tr>
+
+>>> f = FileForm(data={}, files={'file1': {'filename': 'name', 'content':'some content'}}, auto_id=False)
+>>> print f
+<tr><th>File1:</th><td><input type="file" name="file1" /></td></tr>
+>>> f.is_valid()
+True
+
+# Basic form processing in a view #############################################
+
+>>> from django.template import Template, Context
+>>> class UserRegistration(Form):
+...    username = CharField(max_length=10)
+...    password1 = CharField(widget=PasswordInput)
+...    password2 = CharField(widget=PasswordInput)
+...    def clean(self):
+...        if self.cleaned_data.get('password1') and self.cleaned_data.get('password2') and self.cleaned_data['password1'] != self.cleaned_data['password2']:
+...            raise ValidationError(u'Please make sure your passwords match.')
+...        return self.cleaned_data
+>>> def my_function(method, post_data):
+...     if method == 'POST':
+...         form = UserRegistration(post_data, auto_id=False)
+...     else:
+...         form = UserRegistration(auto_id=False)
+...     if form.is_valid():
+...         return 'VALID: %r' % form.cleaned_data
+...     t = Template('<form action="" method="post">\n<table>\n{{ form }}\n</table>\n<input type="submit" />\n</form>')
+...     return t.render(Context({'form': form}))
+
+Case 1: GET (an empty form, with no errors).
+>>> print my_function('GET', {})
+<form action="" method="post">
+<table>
+<tr><th>Username:</th><td><input type="text" name="username" maxlength="10" /></td></tr>
+<tr><th>Password1:</th><td><input type="password" name="password1" /></td></tr>
+<tr><th>Password2:</th><td><input type="password" name="password2" /></td></tr>
+</table>
+<input type="submit" />
+</form>
+
+Case 2: POST with erroneous data (a redisplayed form, with errors).
+>>> print my_function('POST', {'username': 'this-is-a-long-username', 'password1': 'foo', 'password2': 'bar'})
+<form action="" method="post">
+<table>
+<tr><td colspan="2"><ul class="errorlist"><li>Please make sure your passwords match.</li></ul></td></tr>
+<tr><th>Username:</th><td><ul class="errorlist"><li>Ensure this value has at most 10 characters (it has 23).</li></ul><input type="text" name="username" value="this-is-a-long-username" maxlength="10" /></td></tr>
+<tr><th>Password1:</th><td><input type="password" name="password1" value="foo" /></td></tr>
+<tr><th>Password2:</th><td><input type="password" name="password2" value="bar" /></td></tr>
+</table>
+<input type="submit" />
+</form>
+
+Case 3: POST with valid data (the success message).
+>>> print my_function('POST', {'username': 'adrian', 'password1': 'secret', 'password2': 'secret'})
+VALID: {'username': u'adrian', 'password1': u'secret', 'password2': u'secret'}
+
+# Some ideas for using templates with forms ###################################
+
+>>> class UserRegistration(Form):
+...    username = CharField(max_length=10, help_text="Good luck picking a username that doesn't already exist.")
+...    password1 = CharField(widget=PasswordInput)
+...    password2 = CharField(widget=PasswordInput)
+...    def clean(self):
+...        if self.cleaned_data.get('password1') and self.cleaned_data.get('password2') and self.cleaned_data['password1'] != self.cleaned_data['password2']:
+...            raise ValidationError(u'Please make sure your passwords match.')
+...        return self.cleaned_data
+
+You have full flexibility in displaying form fields in a template. Just pass a
+Form instance to the template, and use "dot" access to refer to individual
+fields. Note, however, that this flexibility comes with the responsibility of
+displaying all the errors, including any that might not be associated with a
+particular field.
+>>> t = Template('''<form action="">
+... {{ form.username.errors.as_ul }}<p><label>Your username: {{ form.username }}</label></p>
+... {{ form.password1.errors.as_ul }}<p><label>Password: {{ form.password1 }}</label></p>
+... {{ form.password2.errors.as_ul }}<p><label>Password (again): {{ form.password2 }}</label></p>
+... <input type="submit" />
+... </form>''')
+>>> print t.render(Context({'form': UserRegistration(auto_id=False)}))
+<form action="">
+<p><label>Your username: <input type="text" name="username" maxlength="10" /></label></p>
+<p><label>Password: <input type="password" name="password1" /></label></p>
+<p><label>Password (again): <input type="password" name="password2" /></label></p>
+<input type="submit" />
+</form>
+>>> print t.render(Context({'form': UserRegistration({'username': 'django'}, auto_id=False)}))
+<form action="">
+<p><label>Your username: <input type="text" name="username" value="django" maxlength="10" /></label></p>
+<ul class="errorlist"><li>This field is required.</li></ul><p><label>Password: <input type="password" name="password1" /></label></p>
+<ul class="errorlist"><li>This field is required.</li></ul><p><label>Password (again): <input type="password" name="password2" /></label></p>
+<input type="submit" />
+</form>
+
+Use form.[field].label to output a field's label. You can specify the label for
+a field by using the 'label' argument to a Field class. If you don't specify
+'label', Django will use the field name with underscores converted to spaces,
+and the initial letter capitalized.
+>>> t = Template('''<form action="">
+... <p><label>{{ form.username.label }}: {{ form.username }}</label></p>
+... <p><label>{{ form.password1.label }}: {{ form.password1 }}</label></p>
+... <p><label>{{ form.password2.label }}: {{ form.password2 }}</label></p>
+... <input type="submit" />
+... </form>''')
+>>> print t.render(Context({'form': UserRegistration(auto_id=False)}))
+<form action="">
+<p><label>Username: <input type="text" name="username" maxlength="10" /></label></p>
+<p><label>Password1: <input type="password" name="password1" /></label></p>
+<p><label>Password2: <input type="password" name="password2" /></label></p>
+<input type="submit" />
+</form>
+
+User form.[field].label_tag to output a field's label with a <label> tag
+wrapped around it, but *only* if the given field has an "id" attribute.
+Recall from above that passing the "auto_id" argument to a Form gives each
+field an "id" attribute.
+>>> t = Template('''<form action="">
+... <p>{{ form.username.label_tag }}: {{ form.username }}</p>
+... <p>{{ form.password1.label_tag }}: {{ form.password1 }}</p>
+... <p>{{ form.password2.label_tag }}: {{ form.password2 }}</p>
+... <input type="submit" />
+... </form>''')
+>>> print t.render(Context({'form': UserRegistration(auto_id=False)}))
+<form action="">
+<p>Username: <input type="text" name="username" maxlength="10" /></p>
+<p>Password1: <input type="password" name="password1" /></p>
+<p>Password2: <input type="password" name="password2" /></p>
+<input type="submit" />
+</form>
+>>> print t.render(Context({'form': UserRegistration(auto_id='id_%s')}))
+<form action="">
+<p><label for="id_username">Username</label>: <input id="id_username" type="text" name="username" maxlength="10" /></p>
+<p><label for="id_password1">Password1</label>: <input type="password" name="password1" id="id_password1" /></p>
+<p><label for="id_password2">Password2</label>: <input type="password" name="password2" id="id_password2" /></p>
+<input type="submit" />
+</form>
+
+User form.[field].help_text to output a field's help text. If the given field
+does not have help text, nothing will be output.
+>>> t = Template('''<form action="">
+... <p>{{ form.username.label_tag }}: {{ form.username }}<br />{{ form.username.help_text }}</p>
+... <p>{{ form.password1.label_tag }}: {{ form.password1 }}</p>
+... <p>{{ form.password2.label_tag }}: {{ form.password2 }}</p>
+... <input type="submit" />
+... </form>''')
+>>> print t.render(Context({'form': UserRegistration(auto_id=False)}))
+<form action="">
+<p>Username: <input type="text" name="username" maxlength="10" /><br />Good luck picking a username that doesn't already exist.</p>
+<p>Password1: <input type="password" name="password1" /></p>
+<p>Password2: <input type="password" name="password2" /></p>
+<input type="submit" />
+</form>
+>>> Template('{{ form.password1.help_text }}').render(Context({'form': UserRegistration(auto_id=False)}))
+u''
+
+The label_tag() method takes an optional attrs argument: a dictionary of HTML
+attributes to add to the <label> tag.
+>>> f = UserRegistration(auto_id='id_%s')
+>>> for bf in f:
+...     print bf.label_tag(attrs={'class': 'pretty'})
+<label for="id_username" class="pretty">Username</label>
+<label for="id_password1" class="pretty">Password1</label>
+<label for="id_password2" class="pretty">Password2</label>
+
+To display the errors that aren't associated with a particular field -- e.g.,
+the errors caused by Form.clean() -- use {{ form.non_field_errors }} in the
+template. If used on its own, it is displayed as a <ul> (or an empty string, if
+the list of errors is empty). You can also use it in {% if %} statements.
+>>> t = Template('''<form action="">
+... {{ form.username.errors.as_ul }}<p><label>Your username: {{ form.username }}</label></p>
+... {{ form.password1.errors.as_ul }}<p><label>Password: {{ form.password1 }}</label></p>
+... {{ form.password2.errors.as_ul }}<p><label>Password (again): {{ form.password2 }}</label></p>
+... <input type="submit" />
+... </form>''')
+>>> print t.render(Context({'form': UserRegistration({'username': 'django', 'password1': 'foo', 'password2': 'bar'}, auto_id=False)}))
+<form action="">
+<p><label>Your username: <input type="text" name="username" value="django" maxlength="10" /></label></p>
+<p><label>Password: <input type="password" name="password1" value="foo" /></label></p>
+<p><label>Password (again): <input type="password" name="password2" value="bar" /></label></p>
+<input type="submit" />
+</form>
+>>> t = Template('''<form action="">
+... {{ form.non_field_errors }}
+... {{ form.username.errors.as_ul }}<p><label>Your username: {{ form.username }}</label></p>
+... {{ form.password1.errors.as_ul }}<p><label>Password: {{ form.password1 }}</label></p>
+... {{ form.password2.errors.as_ul }}<p><label>Password (again): {{ form.password2 }}</label></p>
+... <input type="submit" />
+... </form>''')
+>>> print t.render(Context({'form': UserRegistration({'username': 'django', 'password1': 'foo', 'password2': 'bar'}, auto_id=False)}))
+<form action="">
+<ul class="errorlist"><li>Please make sure your passwords match.</li></ul>
+<p><label>Your username: <input type="text" name="username" value="django" maxlength="10" /></label></p>
+<p><label>Password: <input type="password" name="password1" value="foo" /></label></p>
+<p><label>Password (again): <input type="password" name="password2" value="bar" /></label></p>
+<input type="submit" />
+</form>
+"""