[BUG] - Arguments with leading hyphens in the name: escaping?

[andremoeller]

Describe the bug

I expect that my users will give my app optional arguments do contain leading double hyphens like --input. But I cannot parse optional arguments that have a single ("-") or double ("--") before the rest of the word, since such an argument does not exist.

To Reproduce

Steps to reproduce the behavior with a minimum self-contained file.

Replace each part with your own scenario:

• Create a file main.py with:

import typer


app = typer.Typer()


@app.command()
def goodbye(app_args: Optional[List[str]] = typer.Argument(None)):
    print(app_args)


if __name__ == "__main__":
    app()

• Call it with:

python main.py arg1, --arg2, val2

• It outputs:

no such option: --arg2

• But I expected it to output:

('arg1,', '--arg2,', 'val2')

Expected behavior

I wanted to retain arguments with single- or double-hypens. I could find no way to escape them and interpret them literally. I expect optional arguments that do contain leading double hyphems like --input.

Screenshots

If applicable, add screenshots to help explain your problem.

Environment

• OS: [e.g. Linux / Windows / macOS] Mac OS
• Typer Version [e.g. 0.3.0], get it with: 0.3.0

python -c "import typer; print(typer.__version__)"

• Python version, get it with:

python --version 3.7.3

Additional context

Add any other context about the problem here.

[tiangolo]

Hey, as Typer is based on Click, you can do the same as with Click: https://click.palletsprojects.com/en/7.x/arguments/#option-like-arguments

You would use it like:

$ python main.py -- arg1 --arg2 val2

('arg1', '--arg2', 'val2')

[github-actions]

Assuming the original issue was solved, it will be automatically closed now. But feel free to add more comments or create new issues.