Created
April 19, 2017 09:46
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pure python sample implementation of the property() type
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class Property(object): | |
"Emulate PyProperty_Type() in Objects/descrobject.c" | |
def __init__(self, fget=None, fset=None, fdel=None, doc=None): | |
self.fget = fget | |
self.fset = fset | |
self.fdel = fdel | |
if doc is None and fget is not None: | |
doc = fget.__doc__ | |
self.__doc__ = doc | |
def __get__(self, obj, objtype=None): | |
if obj is None: | |
return self | |
if self.fget is None: | |
raise AttributeError("unreadable attribute") | |
return self.fget(obj) | |
def __set__(self, obj, value): | |
if self.fset is None: | |
raise AttributeError("can't set attribute") | |
self.fset(obj, value) | |
def __delete__(self, obj): | |
if self.fdel is None: | |
raise AttributeError("can't delete attribute") | |
self.fdel(obj) | |
def getter(self, fget): | |
return type(self)(fget, self.fset, self.fdel, self.__doc__) | |
def setter(self, fset): | |
return type(self)(self.fget, fset, self.fdel, self.__doc__) | |
def deleter(self, fdel): | |
return type(self)(self.fget, self.fset, fdel, self.__doc__) |
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