今天简单的实现下Porperty装饰器
demo:
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class Porperty:
def __init__(self, fget= None, fset= None, fdel = None):
self.fget= fget
self.fset = fset
self.fdel = fdel
def __get__(self, instance, cls):
if instance is None:
return self
if not callable(self.fget):
raise AttributeError
return self.fget(instance)
def __set__(self, instance, value):
if not callable(self.fset):
raise AttributeError
return self.fset(instance, value)
def __delete__(self, instance):
if not callable(self.fdel):
raise AttributeError
return self.fdel(instance)
def setter(self, fset):
self.fset = fset
return self.fset
def deleter(self, fdel):
self.fdel = fdel
return self.fdel
class A:
def __init__(self,x):
self._x = x
@Porperty
def x(self):
return self._x
a =A(4)
a.x
a.x = 123
class A:
def __init__(self,x):
self._x = x
@Porperty
def x(self):
return self._x
@x.setter
def set_x(self, value):
self._x = value
a = A(5)
a.x
a.x = 7