


What is the difference between decorators @staticmethod and @classmethod
The difference between decorators @staticmethod and @classmethod is: @staticmethod does not require self and cls parameters, @classmethod does not require self parameters, but requires cls parameters.
Generally speaking, when we use a method of a class, we must first instantiate the class, and then use the instantiated class to call its method
class Test(object): """docstring for Test""" def __init__(self, arg=None): super(Test, self).__init__() self.arg = arg def say_hi(self): print 'hello wrold' def main(): test = Test() //1. 首先实例化test类 test.say_hi() //2. 再调用类的方法 if __name__ == '__main__': main()
When using @staticmethod or @classmethod, you can call it directly by class name.method name () without instantiation.
This helps organize the code, put certain functions that should belong to a certain class into that class, and also helps keep the namespace tidy.
class Test(object): """docstring for Test""" def __init__(self, arg=None): super(Test, self).__init__() self.arg = arg def say_hi(self): print 'hello wrold' @staticmethod def say_bad(): print 'say bad' @classmethod def say_good(cls): print 'say good' def main(): test = Test() test.say_hi() Test.say_bad() //直接类名.方法名()来调用 Test.say_good() //直接类名.方法名()来调用 if __name__ == '__main__': main()
The difference between @staticmethod or @classmethod
is an ordinary method of a class, and one parameter requires the self parameter to represent itself.
@staticmethod does not need to represent the self of its own object and the cls parameter of its own class, just like using a function.
@classmethod does not require the self parameter, but the first parameter needs to be the cls parameter representing its own class.
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