On 12/27/19 11:08 PM, jf...@ms4.hinet.net wrote:
Chris Angelico於 2019年12月28日星期六 UTC+8上午11時30分47秒寫道：
On Sat, Dec 28, 2019 at 2:26 PM <jf...@ms4.hinet.net> wrote:
The codes in test.py are:
---------
import argparse
parser = argparse.ArgumentParser()
parser.add_argument('--foo', nargs='?', help='foo help')
parser.add_argument('--goo', nargs=1, help='goo help')
args = parser.parse_args()
print(args.foo, args.goo)
---------
But I get the following result:
---------
D:\Works\Python>py test.py -h
usage: test.py [-h] [--foo [FOO]] [--goo GOO]
optional arguments:
-h, --help show this help message and exit
--foo [FOO] foo help
--goo GOO goo help
D:\Works\Python>py test.py --foo 1 --goo 2
1 ['2']
---------
It seems to me that the help message should be:
usage: test.py [-h] [--foo FOO] [--goo [GOO]]
Do I had missed something?
Can you elaborate on why you expect this? You've declared one of them
to have a single mandatory argument, and the other a single optional
argument. This corresponds to what I'm seeing.
ChrisA
So the square bracket means optional, not list? My misunderstanding:-(
--Jach
Yes, the normal notation is [x] indicates that x is optionial
--
Richard Damon
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