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/
usr/
lib/
python2.6/
dist-packages/
zope/
interface/
tests/
- drwxr-xr-x
|
Viewing file:  odd.py (3.06 KB) -rw-r--r--Select action/file-type:  ( +) |  ( +) |  ( +) | Code ( +) | Session ( +) |  ( +) | SDB ( +) |  ( +) |  ( +) |  ( +) |  ( +) |  ( +) |
##############################################################################
#
# Copyright (c) 2003 Zope Foundation and Contributors.
# All Rights Reserved.
#
# This software is subject to the provisions of the Zope Public License,
# Version 2.1 (ZPL). A copy of the ZPL should accompany this distribution.
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
# FOR A PARTICULAR PURPOSE.
#
##############################################################################
"""Odd meta class that doesn't subclass type.
This is used for testing support for ExtensionClass in new interfaces.
>>> class A(object):
... __metaclass__ = MetaClass
... a = 1
...
>>> A.__name__
'A'
>>> A.__bases__ == (object,)
True
>>> class B(object):
... __metaclass__ = MetaClass
... b = 1
...
>>> class C(A, B): pass
...
>>> C.__name__
'C'
>>> int(C.__bases__ == (A, B))
1
>>> a = A()
>>> aa = A()
>>> a.a
1
>>> aa.a
1
>>> aa.a = 2
>>> a.a
1
>>> aa.a
2
>>> c = C()
>>> c.a
1
>>> c.b
1
>>> c.b = 2
>>> c.b
2
>>> C.c = 1
>>> c.c
1
>>> import sys
>>> if sys.version[0] == '2': # This test only makes sense under Python 2.x
... from types import ClassType
... assert not isinstance(C, (type, ClassType))
>>> int(C.__class__.__class__ is C.__class__)
1
$Id: odd.py 110699 2010-04-09 08:16:17Z regebro $
"""
# class OddClass is an odd meta class
class MetaMetaClass(type):
def __getattribute__(self, name):
if name == '__class__':
return self
return type.__getattribute__(self, name)
class MetaClass(object):
"""Odd classes
"""
__metaclass__ = MetaMetaClass
def __init__(self, name, bases, dict):
self.__name__ = name
self.__bases__ = bases
self.__dict__.update(dict)
def __call__(self):
return OddInstance(self)
def __getattr__(self, name):
for b in self.__bases__:
v = getattr(b, name, self)
if v is not self:
return v
raise AttributeError(name)
def __repr__(self):
return "<odd class %s at %s>" % (self.__name__, hex(id(self)))
class OddInstance(object):
def __init__(self, cls):
self.__dict__['__class__'] = cls
def __getattribute__(self, name):
dict = object.__getattribute__(self, '__dict__')
if name == '__dict__':
return dict
v = dict.get(name, self)
if v is not self:
return v
return getattr(dict['__class__'], name)
def __setattr__(self, name, v):
self.__dict__[name] = v
def __delattr__(self, name):
del self.__dict__[name]
def __repr__(self):
return "<odd %s instance at %s>" % (
self.__class__.__name__, hex(id(self)))
# DocTest:
if __name__ == "__main__":
import doctest, __main__
doctest.testmod(__main__, isprivate=lambda *a: False)
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