技術標籤：python

*args和**kwargs的區別

• 1. *args直接傳入引數值，將傳參整理成Tuple
• 2. **kwargs必須將變數名和值一起傳遞，將傳參整理成dict

1. *args直接傳入引數值，將傳參整理成Tuple

1）例子1

def function(*args):
    print(args, type(args))

function(1, 2)

輸出：
(1, 2) <class 'tuple'>

2）例子2

def function(x,  *args):
    print(args, type(args))

function(1, 2)

輸出：
(2,) <class 'tuple'>
 

2. **kwargs必須將變數名和值一起傳遞，將傳參整理成dict

1）例子1

def function(**kwargs):
    print(args, type(args))

function(a=1, b=2)

輸出：
{'a': 1, 'b': 2} <class 'dict'>

2）例子2

def function(**kwargs):
    print(kwargs, type(kwargs))

function(1,  2)

輸出， 報錯：
Traceback (most recent call last):
  File "D:/Pycharm/project/DataProcess/test0116.py", line 5, in <module>
    function(1, 2)
TypeError: function() takes 0 positional arguments but 2 were given
 

3）例子3

def function(x, **kwargs):
    print(kwargs, type(kwargs))

function(2, a=1, b=2)

輸出：
{'a': 1, 'b': 2} <class 'dict'>

4）例子4

def function(x, **kwargs):
    print(kwargs, type(kwargs))

function(2, 3,  a=1, b=2)

輸出， 報錯：
Traceback (most recent call last):
  File "D:/Pycharm/project/DataProcess/test0116.py", line 5, in <module>
    function(2,3, a=1, b=2)
TypeError: function() takes 1 positional argument but 2 were given