Re-added a few compatibility modules that were removed in r15927 to lower the impact on 3rd party apps.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@15944 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/utils/copycompat.py

@@ -0,0 +1,18 @@
+"""
+Fixes Python 2.4's failure to deepcopy unbound functions.
+"""
+
+import copy
+import types
+import warnings
+
+warnings.warn("django.utils.copycompat is deprecated; use the native copy module instead",
+              PendingDeprecationWarning)
+
+# Monkeypatch copy's deepcopy registry to handle functions correctly.
+if (hasattr(copy, '_deepcopy_dispatch') and types.FunctionType not in copy._deepcopy_dispatch):
+    copy._deepcopy_dispatch[types.FunctionType] = copy._deepcopy_atomic
+
+# Pose as the copy module now.
+del copy, types
+from copy import *

django/utils/hashcompat.py

@@ -0,0 +1,24 @@
+"""
+The md5 and sha modules are deprecated since Python 2.5, replaced by the
+hashlib module containing both hash algorithms. Here, we provide a common
+interface to the md5 and sha constructors, depending on system version.
+"""
+import sys
+import warnings
+
+warnings.warn("django.utils.hashcompat is deprecated; use hashlib instead",
+              PendingDeprecationWarning)
+
+if sys.version_info >= (2, 5):
+    import hashlib
+    md5_constructor = hashlib.md5
+    md5_hmac = md5_constructor
+    sha_constructor = hashlib.sha1
+    sha_hmac = sha_constructor
+else:
+    import md5
+    md5_constructor = md5.new
+    md5_hmac = md5
+    import sha
+    sha_constructor = sha.new
+    sha_hmac = sha

django/utils/itercompat.py

@@ -5,6 +5,7 @@ these implementations if necessary.
 """
 
 import itertools
+import warnings
 
 # Fallback for Python 2.4, Python 2.5
 def product(*args, **kwds):
@@ -31,3 +32,19 @@ def is_iterable(x):
         return False
     else:
         return True
+
+def all(iterable):
+    warnings.warn("django.utils.itercompat.all is deprecated; use the native version instead",
+                  PendingDeprecationWarning)
+    for item in iterable:
+        if not item:
+            return False
+    return True
+
+def any(iterable):
+    warnings.warn("django.utils.itercompat.any is deprecated; use the native version instead",
+                  PendingDeprecationWarning)
+    for item in iterable:
+        if item:
+            return True
+    return False

docs/internals/deprecation.txt

@@ -171,6 +171,14 @@ their deprecation, as per the :ref:`Django deprecation policy
           with a trailing slash to ensure there is a consistent way to
           combine paths in templates.
 
+    * 1.6
+
+        * The compatibility modules ``django.utils.copycompat`` and
+          ``django.utils.hashcompat`` as well as the functions
+          ``django.utils.itercompat.all`` and ``django.utils.itercompat.any``
+          have been deprecated since the 1.4 release. The native versions
+          should be used instead.
+
     * 2.0
         * ``django.views.defaults.shortcut()``. This function has been moved
           to ``django.contrib.contenttypes.views.shortcut()`` as part of the