Python argparse required = True但是--version功能吗? [英] Python argparse required=True but --version functionality?
问题描述
在我所有的脚本中,我都使用标准标志--help
和--version
,但是我似乎无法弄清楚如何使用parser.add_argument(..., required=True)
制作--version
.
In all my scripts I use the standard flags --help
and --version
, however I cannot seem to figure out how to make a --version
with parser.add_argument(..., required=True)
.
import sys, os, argparse
parser = argparse.ArgumentParser(description='How to get --version to work?')
parser.add_argument('--version', action='store_true',
help='print version information')
parser.add_argument('-H', '--hostname', dest='hostname', required=True,
help='Host name, IP Address')
parser.add_argument('-d', '--database', dest='database', required=True,
help='Check database with indicated name')
parser.add_argument('-u', '--username', dest='username', required=True,
help='connect using the indicated username')
parser.add_argument('-p', '--password', dest='password', required=True,
help='use the password to authenticate the connection')
args = parser.parse_args()
if args.version == True:
print 'Version information here'
$ ./arg.py --version
usage: arg.py [-h] [--version] -H HOSTNAME -d DATABASE -u USERNAME -p PASSWORD
arg.py: error: argument -H/--hostname is required
是的,我需要--hostname
和其他,但是我总是希望--version
像--help
(和-h
)一样正常工作./p>
Yes, I want --hostname
and others required, but I always want --version
to work appropriately like --help
(and -h
).
$ ./arg.py --help
usage: arg.py [-h] [--version] -H HOSTNAME -d DATABASE -u USERNAME -p PASSWORD
How to get --version to work?
optional arguments:
-h, --help show this help message and exit
--version print version information
-H HOSTNAME, --hostname HOSTNAME
Host name, IP Address
-d DATABASE, --database DATABASE
Check database with indicated name
-u USERNAME, --username USERNAME
connect using the indicated username
-p PASSWORD, --password PASSWORD
use the password to authenticate the connection
对--version
的工作有帮助吗?
推荐答案
add_argument
有一个特殊的 version action
关键字参数(如此处所述:argparse#action ).
试试看(从工作代码复制):
There is a special version action
keyword argument to add_argument
(As documented here: argparse#action).
Try this (copied from working code):
parser.add_argument('-V', '--version',
action='version',
version='%(prog)s (version 0.1)')
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