"Loris Bennett" <[email protected]> writes:
> Hi,
>
> I am writing a program for the command-line which uses 'argsparse'. I
> want to make some options mandatory by setting 'required=True', but
> still allow the program to run with the option '--version' (which just
> shows the version and then exits) even if the mandatory options are
> missing.
>
> Is there a standard way of doing this?
I see that instead of setting required to 'True' I can use an expression
which checks whether '--version' has been given:
parser.add_argument(
"uid", nargs="+",
help="UIDs to send mail to"
)
parser.add_argument(
'-s', '--subject', dest='subject', required=not '--version' in sys.argv,
help="subject of email"
)
parser.add_argument(
'-c', '--content_file', dest='content_file', required=not '--version'
in sys.argv,
help="file containing mail contents (without salutation or signature)"
)
parser.add_argument(
'--version', action='store_true', dest='version',
help="print version"
However, with the above, I still need to specify the mandatory argument,
even if I only want to see the version.
I guess I'll just have to change
nargs="+"
to
nargs="*"
and check explicitly whether any arguments have been given.
Seems odd to me though that there is not a standard way of implementing
'--version' which works like '--help' does.
Cheers,
Loris
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