[Python-3000] A new member for contextlib?

I suggest a context manager for property defining/redefining. There is a prototype and illustrative example: -------------------------------------------------------------------------------------------------------------- import sys null = object() _property = property class property(_property): # def __init__(self, *args, **kw): _property.__init__(self, *args, **kw) self.__enter__ = self.__enter self.__exit__ = self.__exit # @classmethod def __enter__(self): return null # @classmethod def __exit__(self, type, value, tb): if tb is None: frame = sys._getframe(1) self.__exitHandler(self, frame.f_locals) # def __enter(self): return null # def __exit(self, type, value, tb): if tb is None: frame = sys._getframe(1) self.__exitHandler(self, frame.f_locals) # @staticmethod def __exitHandler(self, _locals): propName = "_" PropName = str(id(self)) for key, value in _locals.items(): if value is null: propName = key PropName = key.capitalize() break if type(self) == type(property): getFunc = _locals.pop('get', None) setFunc = _locals.pop('set', None) delFunc = _locals.pop('delete', None) doc = _locals.pop('doc', None) else: getFunc = _locals.pop('get', None) or self.fget setFunc = _locals.pop('set', None) or self.fset delFunc = _locals.pop('delete', None) or self.fdel doc = _locals.pop('doc', None) or self.__doc__ if getFunc: funcName = "_get"+PropName getFunc.__name__ = funcName _locals[funcName] = getFunc if setFunc: funcName = "_set"+PropName setFunc.__name__ = funcName _locals[funcName] = setFunc if delFunc: funcName = "_del"+PropName delFunc.__name__ = funcName _locals[funcName] = delFunc prop = property(getFunc, setFunc, delFunc) prop.__doc__ = doc _locals[propName] = prop ----------------------------------------------------------------------------------------------------------- def testPropertyMaker(): class AAA: _v = 1 with property as v: doc = "Example of making property with *with* statement" def get(self): return self._v def set(self, v): self._v = v class BBB(AAA): with AAA.v as v: doc = "Example of modified property" def get(self): return [self._v] a=AAA() a.v = 10 print(a.v) print(AAA.v.__doc__) b=BBB() b.v = 100 print(b.v) print(BBB.v.__doc__) This code is also in attachment. Is it suitable for contextlib.py? -------------- next part -------------- An HTML attachment was scrubbed... URL: http://mail.python.org/pipermail/python-3000/attachments/20080404/61e5bb44/attachment.htm -------------- next part -------------- A non-text attachment was scrubbed... Name: withProperty.py Type: text/x-python Size: 2725 bytes Desc: not available Url : http://mail.python.org/pipermail/python-3000/attachments/20080404/61e5bb44/attachment.py