【Python基础】*args，**args的详细用法

 Python基础知识：*args，**args的详细用法

参考：https://blog.csdn.net/qq_29287973/article/details/78040291

*args 不定参数，**kwargs 传入键值对(例如：num1=11,num2=22)

先看示例1：

def test(a,b,c=3,*args):
    print(a)
    print(b)
    print(c)
    print(args)
test(11,22,33,44,55)

 11
 22
 33
 (44,55)

输出结果

也就是说args中保存的是没有利用的所有多余参数，保存方式为元组

再看示例2：

def test(a,b,c=3,*args1,**args2):
    print(a)
    print(b)
    print(c)
    print(args1)
    print(args2)
test(11,22,33,dd=44,ee=55,ff=66)  

 11
 22
 33
 ()
 {'dd':44, 'ee':55, 'ff':66}

输出结果

即输入多余参数有变量名，就保存在**args中保存，保存方式为字典

再看示例3：

def test(a,b,c=3,*args1,**args2):
    print(a)
    print(b)
    print(c)
    print(args1)
    print(args2)

test(11,22,33,"aa","bb",dd=44,ee=55,ff=66)

 11
 22
 33
 ('aa', 'bb')
 {'dd': 44, 'ee': 55, 'ff': 66}

输出结果

补充：

import requests

response = requests.get('http://httpbin.org/get')
print(response.text)

{
  "args": {},
  "headers": {
    "Accept": "*/*",
    "Accept-Encoding": "gzip, deflate",
    "Connection": "close",
    "Host": "httpbin.org",
    "User-Agent": "python-requests/2.18.4"
  },
  "origin": "223.71.166.246",
  "url": "http://httpbin.org/get"
}

输出结果

带参数的get请求，方式1：

import requests

response = requests.get('http://httpbin.org/get?name=xiong&age=25')
print(response.text)

{
  "args": {
    "age": "",
    "name": "xiong"
  },
  "headers": {
    "Accept": "*/*",
    "Accept-Encoding": "gzip, deflate",
    "Connection": "close",
    "Host": "httpbin.org",
    "User-Agent": "python-requests/2.18.4"
  },
  "origin": "223.71.166.246",
  "url": "http://httpbin.org/get?name=0bug&age=25"
}

输出结果

带参数的get请求，方式2：

params 表示函数的参数是可变个数的

import requests

data = {
    'name': 'xiong',
    'age': 25
}
response = requests.get('http://httpbin.org/get', params=data)
print(response.text)

{
  "args": {
    "age": "",
    "name": "xiong"
  },
  "headers": {
    "Accept": "*/*",
    "Accept-Encoding": "gzip, deflate",
    "Connection": "close",
    "Host": "httpbin.org",
    "User-Agent": "python-requests/2.18.4"
  },
  "origin": "223.71.166.246",
  "url": "http://httpbin.org/get?name=0bug&age=25"
}

输出结果