click.argument cannot handle negative numbers

[CloudNiner]

Expected Behavior

I should be able to pass a negative number to a click.argument. I get the same error below if I attempt to parse a negative number as type=str or type=float. click.option works as expected.

import click


@click.command()
@click.argument("num", type=int)
def main(num):
    print(num)


if __name__ == "__main__":
    main()

Actual Behavior

Tell us what happens instead.

> python click_test.py -4
Usage: click_test.py [OPTIONS] NUM
Try 'click_test.py --help' for help.

Error: no such option: -4

Environment

• Python version: 3.7.7
• Click version: 7.1.2

[davidism]

This isn't a Click issue, it's a general shell quoting issue. Quote values that look like command line syntax: python click_test.py '-4'.

[CloudNiner]

I get the same error if I quote with single or double quotes in both zsh and bash.

A test program that uses argparse generates the expected output:

import argparse

parser = argparse.ArgumentParser(description="Process an integer.")
parser.add_argument("integer", type=int, help="an integer")

args = parser.parse_args()
print(args.integer)

> python argparse_test.py -4
-4

[davidism]

Sorry, was thinking of escaping shell expansion. For arguments, you'll need to specify them after the -- flag to turn off option parsing: example.py -- -4, or set ignore_unknown_options=True in the context. https://click.palletsprojects.com/en/7.x/arguments/?highlight=ignore_unknown_options#option-like-arguments Otherwise it's not possible to unambiguously identify "-2" as an argument value instead of an invalid option name.

[CloudNiner]

👍 thanks for the explanation