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Issue #17351: Modernize the pure Python property() example.

This commit is contained in:
Raymond Hettinger 2013-03-10 09:41:18 -07:00
parent a51be4c136
commit 632c8c8ab1
1 changed files with 14 additions and 3 deletions
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17
Doc/howto/descriptor.rst
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@ -210,25 +210,36 @@ here is a pure Python equivalent::
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"
raise AttributeError("unreadable attribute")
return self.fget(obj)
def __set__(self, obj, value):
if self.fset is None:
raise AttributeError, "can't set attribute"
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"
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__)
The :func:`property` builtin helps whenever a user interface has granted
attribute access and then subsequent changes require the intervention of a
method.