class F:
def __setattr__(self, key, value):
if key in self.__dict__:
pass
else:
self.__dict__[key] = value
def __getattr__(self, item):
"""
对象没有item属性时才会调用这个方法
:param item:
:return:
"""
return '"{}" not exists'.format(item)
def __delattr__(self, item):
if item in self.__dict__:
self.__dict__.pop(item)
print('delete "{}" successfully'.format(item))
else:
print('delete failed, not exist "{}"'.format(item))
f = F()
f.name = 'kai'
print(f.name)
print(f.namse)
del f.a
del f.name
kai
"namse" not exists
delete failed, not exist "a"
delete "name" successfully
