关于Python命令行传递参数的问题

Question

import argparse
parser = argparse.ArgumentParser()
parser.add_argument("-v", "--verbose", help="increase output verbosity",
                    action="store_true")
args = parser.parse_args()
if args.verbose:
    print "verbosity turned on"

运行如下：

$ python prog.py -v
verbosity turned on
$ python prog.py --help
usage: prog.py [-h] [-v]

从这里来看，help="increase output verbosity" ，似乎没什么用处？？？

Answer 1

阁下没看仔细

python prog.py --help

usage: a.py [-h] [-v]

optional arguments:
  -h, --help     show this help message and exit
  -v, --verbose  increase output verbosity