python中为main方法传参问题

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# @Author(s): xili
# @Created: 2020/6/30
import sys
 
if __name__ == '__main__':
    arg1 = sys.argv[1]
    arg2 = sys.argv[2]
    print(arg1)
    print(arg2)

#!/usr/bin/python
# -*- coding: utf-8 -*-
def info(name,age,major):
    print("姓名:%s"%(name))
    print("年龄:%s"%(age))
    print("职业:%s"%(major))
info("zhulang",27,"IT")  #实参与形参一一对应

#!/usr/bin/python
# -*- coding: utf-8 -*-
def info(name,major,age=25): #默认参数必须放在位置参数后面，否则出错
    print("姓名:%s"%(name))
    print("年龄:%s"%(age))
    print("职业:%s"%(major))
info("zhulang","IT")

def calc(l):
    sum = 0
    for n in l:
        sum += n
    return sum
calc([1,2,3]) #参数传入的是列表，结果为7

def calc(*nums):
    sum = 0
    for n in nums:
        sum += n
    return sum

>>> nums = [1, 2, 3]
>>> calc(*nums)
7

def person_info(name, age, **kw):
    print("name", name, "age", age, "other", kw)
>>> person_info("zhulang", 12)
name zhulang age 12 other{}
>>> person_info("zhulang", 27, city = "Beijing")
name zhulang age 27 other {'city':'Beijing'}

#这里星号分割符后面的city、job是命名关键字参数
person_info(name, age, *, city, job):
    print(name, age, city, job)
 
>>> person_info("zhulang", 17, city = "Beijing", job = "Engineer")
zhulang 17 Beijing Engineer    #看来这里不再被自动组装为字典