with argparse, is it possible to check whether the first positional argument has been entered:

import argparse

if __name__ == "__main__":

    parser = argparse.ArgumentParser()
    parser.add_argument("object_type", type=str)
    parser.add_argument("--pass1", type=str)
    parser.add_argument("--pass2", type=str)

    args = parser.parse_args()

    print(args)

when calling: myscript.py –pass1=foo, I get the error:
error: the following arguments are required: object_type

what makes sense, but there don’t seem to be a way to catch the error beforehand.

Something like:

if args.object_type is None:
    raise argparse.ArgumentError(message="object_type must be defined!")

tried also with try/except with no luck.

possible or not ?