python中argparse模块基础及使用步骤

git -h
git -version 
git show

1.导包：
import argparse
2.创建对象：
parser = argparse.ArgumentParser()
3.添加参数：
parser.add_argument()
4.解析参数：
parser.parse_args()

parser = ArgumentParser(prog=None, usage=None,description=None, epilog=None, parents=[],fORMatter_class=argparse.HelpFormatter, prefix_chars='-',fromfile_prefix_chars=None, argument_default=None,conflict_handler='error', add_help=True)

add_argument(name or flags...[, action][, nargs][, const][, default][, type][, choices][, required][, help][, metavar][, dest])

# 可选参数
parser.add_argument("-f", "--foo")
# 位置参数
parser.add_argument("bar")  # 位置参数在运行时一定要输入

parse.add_argument('--version',action = 'version',version = '%(prog)s2.0')

python py.py -i 1  # 使用空格分开
python py.py --integer=1  # 长选项使用等号分开
python py.py -i1  # 短选项可以写一起

args = parser.parse_args()  # 括号里面可以传入命令行的参数
args_ = parser.parse_args("-i=1".split("="))

#!/usr/bin/env python
# -*- coding: UTF-8 -*-
__author__ = "A.L.Kun"
__file__ = "demo01.py"
__time__ = "2022/6/16 17:12"
__email__ = "liu.zhong.kun@foxmail.com"
from typing import Callable
from functools import wraps
import sys, argparse
def terminal(param: bool = False):  # 判断是否要使用命令行参数
    def get_params(fun: Callable):
        if param:
            parser = argparse.ArgumentParser(description="help document")
            "---------------------------------------------------------------"
			# 如果需要从命令行传入参数时，就在这里添加
            "---------------------------------------------------------------"
            args = parser.parse_args()
        else:
            args = None
        @wraps(fun)
        def inner():
            ret = fun(args)  # 可能在传参数是还要进行其他的初始化操作
            return ret
        return inner
    return get_params
@terminal()  # 使用装饰器
def main(args): 
    print(args)
if __name__ == "__main__":
    main()
    sys.exit(0)

#!/usr/bin/env python
# -*- coding: UTF-8 -*-
__author__ = "A.L.Kun"
__file__ = "demo01.py"
__time__ = "2022/6/16 17:12"
__email__ = "liu.zhong.kun@foxmail.com"
from smtplib import SMTP
from typing import Callable
from functools import wraps
import sys, argparse
def terminal(param: bool = False):
    def get_params(fun: Callable):
        if param:
            parser = argparse.ArgumentParser(description="help document")
            "---------------------------------------------------------------"
            parser.add_argument('--version', "-v", action='version', version='%(prog)s 2.0')
            parser.add_argument("-u", "--username", type=str, help="Enter the SMTP server account", required=True)
            parser.add_argument("-p", "--passWord", type=str, help="Enter the SMTP server password", required=True)
            "---------------------------------------------------------------"
            args = parser.parse_args()
        else:
            args = None
        @wraps(fun)
        def inner():
            ret = fun(args)
            return ret
        return inner
    return get_params
@terminal(True)
def main(args):
    smtp = SMTP('smtp.qq.com')
    smtp.login(args.username, args.password)
    smtp.quit()
    smtp.close()
if __name__ == "__main__":
    main()
    sys.exit(0)