> I want to have an argument's presence only - value is not required.
> For example, my program main.py needs to know if "-r" is present when program
> is invoked.
> So the value command line would be:
> (1) python3 main.py -r
> or...
> (1) python3 main.py
>
> I tried following:
> parser.add_argument('-r','--register', help='Register it')
You should use the "store_true" action, or perhaps some other action.
A complete minimal working sample is as follows.
import argparse
parser = argparse.ArgumentParser()
parser.add_argument("-r", "--register", help="Register it",
action="store_true")
args = parser.parse_args()
if args.register:
print("Seen register")
For more, I suggest reading the quick tutorial in the documentation,
available at https://docs.python.org/3/howto/argparse.html#id1
Good luck! - DLD
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