Python-Class Property Query protocol-__getattr__ __getattribute__

__getattr__

Called when a class attribute is not found

Class Beimenchuixue:    def __init__ (self, name):        self.name = name    def __getattr__ (self, item):        print ("% s not find ", item)        Raise Exception (" instance method not found ") if __name__ = = ' __main__ ':    Bei_men_chui_xue = Beimenchuixue (" North Gate blowing Snow ")    print (bei_men_chui_xue.name)    # without this property    print (Bei_men_chui_xue.hello)

　　

__getattribute__

Unconditional entry, whether the lookup attribute exists, can not be rewritten without rewriting

Class Beimenchuixue:    def __init__ (self, name):        self.name = name    def __getattribute__ (self, item):        Print ("%s  find"% item) If __name__ = = ' __main__ ':    Bei_men_chui_xue = Beimenchuixue ("North Gate Blowing Snow")    # can find, will find actually _ _getattribute__ return value    print (bei_men_chui_xue.name)    # does not have this property    print (Bei_men_chui_xue.hello)

　　

Python-Class Property Query protocol-__getattr__ __getattribute__