Fixed #20746 -- Removed Python 2.6 specific code/docs

6 files changed, 7 insertions, 125 deletions

diff --git a/django/core/mail/message.py b/django/core/mail/message.py
index 98ab3c9075..db9023a0bb 100644
--- a/django/core/mail/message.py
+++ b/django/core/mail/message.py
@@ -3,7 +3,6 @@ from __future__ import unicode_literals
 import mimetypes
 import os
 import random
-import sys
 import time
 from email import charset as Charset, encoders as Encoders
 from email.generator import Generator
@@ -139,9 +138,6 @@ class SafeMIMEText(MIMEText):
         """
         fp = six.StringIO()
         g = Generator(fp, mangle_from_ = False)
-        if sys.version_info < (2, 6, 6) and isinstance(self._payload, six.text_type):
-            # Workaround for http://bugs.python.org/issue1368247
-            self._payload = self._payload.encode(self._charset.output_charset)
         g.flatten(self, unixfrom=unixfrom)
         return fp.getvalue()
 
diff --git a/django/db/models/fields/__init__.py b/django/db/models/fields/__init__.py
index a7e0b52e87..ddc76fccf7 100644
--- a/django/db/models/fields/__init__.py
+++ b/django/db/models/fields/__init__.py
@@ -1,5 +1,6 @@
 from __future__ import unicode_literals
 
+import collections
 import copy
 import datetime
 import decimal
@@ -17,7 +18,6 @@ from django.core import exceptions, validators
 from django.utils.datastructures import DictWrapper
 from django.utils.dateparse import parse_date, parse_datetime, parse_time
 from django.utils.functional import curry, total_ordering
-from django.utils.itercompat import is_iterator
 from django.utils.text import capfirst
 from django.utils import timezone
 from django.utils.translation import ugettext_lazy as _
@@ -585,7 +585,7 @@ class Field(object):
         return bound_field_class(self, fieldmapping, original)
 
     def _get_choices(self):
-        if is_iterator(self._choices):
+        if isinstance(self._choices, collections.Iterator):
             choices, self._choices = tee(self._choices)
             return choices
         else:
diff --git a/django/db/models/sql/where.py b/django/db/models/sql/where.py
index 024b995c99..2e83ecdce4 100644
--- a/django/db/models/sql/where.py
+++ b/django/db/models/sql/where.py
@@ -4,6 +4,7 @@ Code to manage the creation and SQL rendering of 'where' constraints.
 
 from __future__ import absolute_import
 
+import collections
 import datetime
 from itertools import repeat
 
@@ -11,7 +12,6 @@ from django.conf import settings
 from django.db.models.fields import DateTimeField, Field
 from django.db.models.sql.datastructures import EmptyResultSet, Empty
 from django.db.models.sql.aggregates import Aggregate
-from django.utils.itercompat import is_iterator
 from django.utils.six.moves import xrange
 from django.utils import timezone
 from django.utils import tree
@@ -61,7 +61,7 @@ class WhereNode(tree.Node):
         if not isinstance(data, (list, tuple)):
             return data
         obj, lookup_type, value = data
-        if is_iterator(value):
+        if isinstance(value, collections.Iterator):
             # Consume any generators immediately, so that we can determine
             # emptiness and transform any non-empty values correctly.
             value = list(value)
diff --git a/django/test/testcases.py b/django/test/testcases.py
index 04d044de27..d0442360ac 100644
--- a/django/test/testcases.py
+++ b/django/test/testcases.py
@@ -8,7 +8,6 @@ import json
 import os
 import re
 import sys
-import select
 import socket
 import threading
 import unittest
@@ -924,104 +923,6 @@ class QuietWSGIRequestHandler(WSGIRequestHandler):
         pass
 
 
-if sys.version_info >= (3, 3, 0):
-    _ImprovedEvent = threading.Event
-elif sys.version_info >= (2, 7, 0):
-    _ImprovedEvent = threading._Event
-else:
-    class _ImprovedEvent(threading._Event):
-        """
-        Does the same as `threading.Event` except it overrides the wait() method
-        with some code borrowed from Python 2.7 to return the set state of the
-        event (see: http://hg.python.org/cpython/rev/b5aa8aa78c0f/). This allows
-        to know whether the wait() method exited normally or because of the
-        timeout. This class can be removed when Django supports only Python >= 2.7.
-        """
-
-        def wait(self, timeout=None):
-            self._Event__cond.acquire()
-            try:
-                if not self._Event__flag:
-                    self._Event__cond.wait(timeout)
-                return self._Event__flag
-            finally:
-                self._Event__cond.release()
-
-
-class StoppableWSGIServer(WSGIServer):
-    """
-    The code in this class is borrowed from the `SocketServer.BaseServer` class
-    in Python 2.6. The important functionality here is that the server is non-
-    blocking and that it can be shut down at any moment. This is made possible
-    by the server regularly polling the socket and checking if it has been
-    asked to stop.
-    Note for the future: Once Django stops supporting Python 2.6, this class
-    can be removed as `WSGIServer` will have this ability to shutdown on
-    demand and will not require the use of the _ImprovedEvent class whose code
-    is borrowed from Python 2.7.
-    """
-
-    def __init__(self, *args, **kwargs):
-        super(StoppableWSGIServer, self).__init__(*args, **kwargs)
-        self.__is_shut_down = _ImprovedEvent()
-        self.__serving = False
-
-    def serve_forever(self, poll_interval=0.5):
-        """
-        Handle one request at a time until shutdown.
-
-        Polls for shutdown every poll_interval seconds.
-        """
-        self.__serving = True
-        self.__is_shut_down.clear()
-        while self.__serving:
-            r, w, e = select.select([self], [], [], poll_interval)
-            if r:
-                self._handle_request_noblock()
-        self.__is_shut_down.set()
-
-    def shutdown(self):
-        """
-        Stops the serve_forever loop.
-
-        Blocks until the loop has finished. This must be called while
-        serve_forever() is running in another thread, or it will
-        deadlock.
-        """
-        self.__serving = False
-        if not self.__is_shut_down.wait(2):
-            raise RuntimeError(
-                "Failed to shutdown the live test server in 2 seconds. The "
-                "server might be stuck or generating a slow response.")
-
-    def handle_request(self):
-        """Handle one request, possibly blocking.
-        """
-        fd_sets = select.select([self], [], [], None)
-        if not fd_sets[0]:
-            return
-        self._handle_request_noblock()
-
-    def _handle_request_noblock(self):
-        """
-        Handle one request, without blocking.
-
-        I assume that select.select has returned that the socket is
-        readable before this function was called, so there should be
-        no risk of blocking in get_request().
-        """
-        try:
-            request, client_address = self.get_request()
-        except socket.error:
-            return
-        if self.verify_request(request, client_address):
-            try:
-                self.process_request(request, client_address)
-            except Exception:
-                self.handle_error(request, client_address)
-                self.close_request(request)
-
-
 class _MediaFilesHandler(StaticFilesHandler):
     """
     Handler for serving the media files. This is a private class that is
@@ -1071,7 +972,7 @@ class LiveServerThread(threading.Thread):
             # one that is free to use for the WSGI server.
             for index, port in enumerate(self.possible_ports):
                 try:
-                    self.httpd = StoppableWSGIServer(
+                    self.httpd = WSGIServer(
                         (self.host, port), QuietWSGIRequestHandler)
                 except WSGIServerException as e:
                     if (index + 1 < len(self.possible_ports) and
diff --git a/django/utils/functional.py b/django/utils/functional.py
index 93befcf59e..d5d52205d7 100644
--- a/django/utils/functional.py
+++ b/django/utils/functional.py
@@ -398,9 +398,8 @@ def partition(predicate, values):
 if sys.version_info >= (2, 7, 2):
     from functools import total_ordering
 else:
-    # For Python < 2.7.2. Python 2.6 does not have total_ordering, and
-    # total_ordering in 2.7 versions prior to 2.7.2 is buggy. See
-    # http://bugs.python.org/issue10042 for details. For these versions use
+    # For Python < 2.7.2. total_ordering in versions prior to 2.7.2 is buggy.
+    # See http://bugs.python.org/issue10042 for details. For these versions use
     # code borrowed from Python 2.7.3.
     def total_ordering(cls):
         """Class decorator that fills in missing ordering methods"""
diff --git a/django/utils/itercompat.py b/django/utils/itercompat.py
index 1df1e57cb2..096f808671 100644
--- a/django/utils/itercompat.py
+++ b/django/utils/itercompat.py
@@ -4,9 +4,6 @@ Where possible, we try to use the system-native version and only fall back to
 these implementations if necessary.
 """
 
-import collections
-import sys
-
 
 def is_iterable(x):
     "A implementation independent way of checking for iterables"
@@ -16,14 +13,3 @@ def is_iterable(x):
         return False
     else:
         return True
-
-def is_iterator(x):
-    """An implementation independent way of checking for iterators
-
-    Python 2.6 has a different implementation of collections.Iterator which
-    accepts anything with a `next` method. 2.7+ requires and `__iter__` method
-    as well.
-    """
-    if sys.version_info >= (2, 7):
-        return isinstance(x, collections.Iterator)
-    return isinstance(x, collections.Iterator) and hasattr(x, '__iter__')