Python命令模块argparse学习笔记

Posted 2020-10-21 Sch01aR#

首先是关于-h/--help参数的设置

description：位于help信息前，可用于描述help
prog：描述help信息中程序的名称
epilog：位于help信息后
usage：描述程序的用途
add_help：默认为True，设为False后，就不能显示help信息了，执行-h/--help将会报错
conflict_handler：解决参数冲突
prefix_chars：参数前缀，默认为"-"
fromfile_prefix_chars：设置前缀字符，放在文件名之前，对文件里的参数进行读取和执行
argument_default：参数的全局默认值

description/epilog

# -*- coding:utf-8 -*-
__author__ = "MuT6 Sch01aR"

import argparse
parser = argparse.ArgumentParser(description="The Help Of Python")
parser.add_argument("-t","--thread",help="Thread Run",action="store_true")
args = parser.parse_args()
if args.thread:
    print(args)
else:
    print("Error")

执行参数-h

运行结果

prog/usage

# -*- coding:utf-8 -*-
__author__ = "MuT6 Sch01aR"

import argparse
parser = argparse.ArgumentParser(description="The Help Of Python",epilog="End Of Help",usage="Python Run Thread")
parser.add_argument("-t","--thread",help="Thread Run",action="store_true")
args = parser.parse_args()
if args.thread:
    print(args)
else:
    print("Error")

 运行结果

默认的为

如果没有设置prog和usage则显示默认的，prog和usage都设置的话，显示usage的

add_help

# -*- coding:utf-8 -*-
__author__ = "MuT6 Sch01aR"

import argparse
parser = argparse.ArgumentParser(description="The Help Of Python",epilog="End Of Help",add_help=False)
parser.add_argument("-t","--thread",help="Thread Run",action="store_true")
args = parser.parse_args()
if args.thread:
    print(args)
else:
    print("Error")

 运行结果

conflict_handler

当有参数重复的时候，程序会报错，把conflict_handler设置为resovle就可以解决

# -*- coding:utf-8 -*-
__author__ = "MuT6 Sch01aR"

import argparse
parser = argparse.ArgumentParser(description="The Help Of Python",epilog="End Of Help")
parser.add_argument("-t","--thread",help="Thread Run",action="store_true")
parser.add_argument("-t","--thread",help="Thread Run(2)",action="store_true")
args = parser.parse_args()
if args.thread:
    print(args)
else:
    print("Error")

 运行，报错

给argparse.ArgumentParser()添加conflict_handler="resolve"

# -*- coding:utf-8 -*-
__author__ = "MuT6 Sch01aR"

import argparse
parser = argparse.ArgumentParser(description="The Help Of Python",epilog="End Of Help",conflict_handler="resolve")
parser.add_argument("-t","--thread",help="Thread Run",action="store_true")
parser.add_argument("-t","--thread",help="Thread Run(2)",action="store_true")
args = parser.parse_args()
if args.thread:
    print(args)
else:
    print("Error")

 运行结果

原先的-t/--thread参数被覆盖