问题:argparse模块如何添加不带任何参数的选项?

我使用创建了一个脚本argparse

脚本需要使用配置文件名作为选项,用户可以指定是完全执行脚本还是仅模拟脚本。

要传递的args:./script -f config_file -s./script -f config_file

-f config_file部分可以,但是它一直在询问我-s的参数,该参数是可选的,不应跟随任何参数。

我已经试过了:

parser = argparse.ArgumentParser()
parser.add_argument('-f', '--file')
#parser.add_argument('-s', '--simulate', nargs = '0')
args = parser.parse_args()
if args.file:
    config_file = args.file
if args.set_in_prod:
        simulate = True
else:
    pass

有以下错误:

File "/usr/local/lib/python2.6/dist-packages/argparse.py", line 2169, in _get_nargs_pattern
nargs_pattern = '(-*%s-*)' % '-*'.join('A' * nargs)
TypeError: can't multiply sequence by non-int of type 'str'

和相同的错误,''而不是0

I have created a script using argparse.

The script needs to take a configuration file name as an option, and user can specify whether they need to proceed totally the script or only simulate it.

The args to be passed: ./script -f config_file -s or ./script -f config_file.

It’s ok for the -f config_file part, but It keeps asking me for arguments for the -s which is optionnal and should not be followed by any.

I have tried this:

parser = argparse.ArgumentParser()
parser.add_argument('-f', '--file')
#parser.add_argument('-s', '--simulate', nargs = '0')
args = parser.parse_args()
if args.file:
    config_file = args.file
if args.set_in_prod:
        simulate = True
else:
    pass

With the following errors:

File "/usr/local/lib/python2.6/dist-packages/argparse.py", line 2169, in _get_nargs_pattern
nargs_pattern = '(-*%s-*)' % '-*'.join('A' * nargs)
TypeError: can't multiply sequence by non-int of type 'str'

And same errror with '' instead of 0.


回答 0

@Felix Kling建议使用action='store_true'

>>> from argparse import ArgumentParser
>>> p = ArgumentParser()
>>> _ = p.add_argument('-f', '--foo', action='store_true')
>>> args = p.parse_args()
>>> args.foo
False
>>> args = p.parse_args(['-f'])
>>> args.foo
True

As @Felix Kling suggested use action='store_true':

>>> from argparse import ArgumentParser
>>> p = ArgumentParser()
>>> _ = p.add_argument('-f', '--foo', action='store_true')
>>> args = p.parse_args()
>>> args.foo
False
>>> args = p.parse_args(['-f'])
>>> args.foo
True

回答 1

要创建不需要任何值的选项,请设置 的它'store_const''store_true''store_false'

例:

parser.add_argument('-s', '--simulate', action='store_true')

To create an option that needs no value, set the of it to 'store_const', 'store_true' or 'store_false'.

Example:

parser.add_argument('-s', '--simulate', action='store_true')

声明:本站所有文章,如无特殊说明或标注,均为本站原创发布。任何个人或组织,在未征得本站同意时,禁止复制、盗用、采集、发布本站内容到任何网站、书籍等各类媒体平台。如若本站内容侵犯了原著者的合法权益,可联系我们进行处理。