Context

The main block in pymongo/uri_parser.py reads sys.argv[1] without checking that an argument was supplied. Running python -m pymongo.uri_parser with no URI raises an unhandled IndexError and dumps a traceback instead of printing usage.

Definition of done

Change to:

if _name_ == "_main_":
    import pprint

    if len(sys.argv) < 2:
        print("usage: python -m pymongo.uri_parser <uri>")  # noqa: T201
        sys.exit(1)
    try:
        pprint.pprint(parse_uri(sys.argv[1]))  # noqa: F405, T203
    except InvalidURI as exc:
        print(exc)  # noqa: T201
    sys.exit(0)

Then add a regression test (test_missing_arg_prints_usage) asserting the usage message and a non-zero exit code.

Pitfalls

NA