argparse 模块如何在没有任何参数的情况下添加选项? [英] argparse module How to add option without any argument?
问题描述
我使用 argparse
创建了一个脚本.
脚本需要带一个配置文件名作为选项,用户可以指定是完全执行脚本还是只模拟它.
要传递的参数:./script -f config_file -s
或 ./script -f config_file
.
-f config_file 部分没问题,但它一直要求我提供 -s 的参数,这是可选的,后面不应该跟任何.
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()如果 args.file:config_file = args.file如果 args.set_in_prod:模拟 = 真别的:经过
出现以下错误:
文件/usr/local/lib/python2.6/dist-packages/argparse.py",第2169行,_get_nargs_patternnargs_pattern = '(-*%s-*)' % '-*'.join('A' * nargs)类型错误:不能将序列乘以str"类型的非整数
和 ''
而不是 0
的相同错误.
As @Felix Kling 建议使用action='store_true'
:
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
.
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
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