[Python知识库]Python | *args & **kwargs

Python | *args & **kwargs

*args和**kwargs主要是为了方便传递参数，*args是一个元组，**kwargs是一个词典，都支持类似可变参数传参。

注意

• *args和**kwargs同时出现，*args必须在前面

def demo_args(first, *args):
    print(first)
    print(type(args))
    for arg in args:
        print(arg)


def demo_kwargs(first, **kwargs):
    print(first)
    print(type(kwargs))
    for key, val in kwargs.items():
        print(key, val)


def demo_args_kwargs(first, *args, **kwargs):
    print(first)

    print(type(args))
    for arg in args:
        print(arg)

    print(type(kwargs))
    for key, val in kwargs.items():
        print(key, val)


if __name__ == '__main__':
    demo_args("This is *args", 1, 2, 3, 4)

    print("--------------------------------")
    demo_kwargs("This is **kwargs", name="yimt", age=123)

    print("--------------------------------")
    demo_args_kwargs("This is *args and **kwargs", 1, 2, 3, name="yimt", age=123)

Output

This is *args
<class 'tuple'>
1
2
3
4
--------------------------------
This is **kwargs
<class 'dict'>
name yimt
age 123
--------------------------------
This is *args and **kwargs
<class 'tuple'>
1
2
3
<class 'dict'>
name yimt
age 123