实例方法，类方法，静态方法

class Foo():

    h = "hello world"

    def __init__(self, key, value):
        self.key = key
        self.value = value

    def foo_test(self):
        print("实例方法")
        print(self.h)
        print(self.key + self.value)
        print("-------"*5)

    @staticmethod
    def foo_static():
        print("静态方法")
        print(Foo.h)
        print("-------" * 5)

    @classmethod
    def foo_class(cls):
        print("类方法")
        key = 1
        value = 2
        dite = cls(key, value)
        dite.foo_test()


if __name__ == '__main__':
    f = Foo(5,6)
    f.foo_test()
    f.foo_static()
    f.foo_class()
    print("-----"*4)
    Foo.foo_static()
    Foo.foo_class()