python使用argparse解析命令行参数

python例子

#!/usr/bin/python3
# -*- coding: utf-8 -*-
import sys
import argparse
import os
import tarfile  


untar_path = ""
out_dir = ""


def parse_usage():
    parser = argparse.ArgumentParser()
    parser.add_argument('-o', '--outdir', dest='out dir')
    parser.add_argument('-i', '--inpath', dest='tar path')
    args = parser.parse_args()
    global untar_path
    global out_dir
    try:
        out_dir = args.outdir
        untar_path = args.inpath
    except:
        pass

    if '' ==  untar_path:
        parser.print_help()
        sys.exit()
    if '' ==  out_dir:
        parser.print_help()
        sys.exit()

    if not os.path.isfile(untar_path):
        print("{} is not file!".format(untar_path))
        sys.exit()
    if os.path.exists(out_dir):
        if os.path.isfile(out_dir):
            print("{} is file!".format(out_dir))
            sys.exit()
    else:
        print("mkdir {}".format(out_dir))
        os.mkdir(out_dir)
        if not os.path.exists(out_dir):
            print("{} is not exists!".format(out_dir))
            sys.exit()
    print("tar({}) \nout dir({})".format(untar_path, out_dir))
    return 


def untar(tarpath, outdir):
    tar = tarfile.open(tarpath)  
    tar.extractall(path = outdir)
    tar.close()  
    return 


if __name__ == "__main__":
    '''main'''
    parse_usage() 
    untar(untar_path, out_dir)

输出：

# untar2.py --help
usage: untar2.py [-h] [-o OUT DIR] [-i TAR PATH]

options:
  -h, --help            show this help message and exit
  -o OUT DIR, --outdir OUT DIR
  -i TAR PATH, --inpath TAR PATH