[Patches] [ python-Patches-667730 ] More DictMixin

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Patches item #667730, was opened at 2003-01-14 14:27
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https://sourceforge.net/tracker/?func=detail&atid=305470&aid=667730&group_id=5470

Category: Library (Lib)
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Sebastien Keim (s_keim)
Assigned to: Nobody/Anonymous (nobody)
Summary: More DictMixin

Initial Comment:
This patch is intended to provide a more consistent
implementation for the various dictionary like objects
of the standard library.

test_userdict has been rewritten, it now use unittest
and define a test-case wich allow to check for
conformity with the dictionary protocol. 

test_shelve and test_weakref have been rewritten to use
the test_userdict test-case.

test_os has been extended: a new test case check for
environ object conformity to the dictionary protocol.

The patch modify the UserDict module:
* The doc says that __contains__ should be one of the
methods to redefine for better efficiency but the
implementation make __contains__ dependent of has_key
definition. The patch reverse methods dependencies.
* Change iterkey = __iter__ to def iterkey(self):
return self.__iter__() to make iterkey able to use
overiden __iter__ methods. 
* I have also a added __init__, copy and  __repr__
methods to DictMixin. 
* The UserDict.UserDict class is a subclass of
DictMixin, this allow to simplify UserDict
implementation. The patch is rather conservative since
a lot of methods definition could still be removed from
UserDict.

In the weakref module, the  patch make
WeakValueDictionnary and WeakKeyDictionnary subclasses
of UserDict.DictMixin. It also use nested scopes, the
new generators syntax  for iterator methods and rewrite
WeakKeyDictionnary.__delitem__ . All of this allow to
decrease the 
module size by 50%.

In the shelve module, the patch add a copy() method
which return a dictionary with the keys and values of
the database.

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https://sourceforge.net/tracker/?func=detail&atid=305470&aid=667730&group_id=5470