[BUG] Example not working as expected

Describe the bug

Write here a clear and concise description of what the bug is.

To Reproduce

• Create a file main.py with:

import typer

app = typer.Typer()

@app.command()
def hello(name: str, formal: bool = False):
    if formal:
        typer.echo(f'Hello {name}')
    else:
        typer.echo(f'Whaaaasuuuup {name}')

if __name__ == '__main__':
    app()

• Call it with:

python main.py --formal John

• It outputs:

Error: Got unexpected extra argument (Kike)

• But I expected it to output:

Hello John

Environment

• OS: Linux (Ubuntu 18.04)
• Typer Version: 0.0.4

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

• Python version: 3.6.9

[enbermudas]

I just closed and reopened my terminal and it is working now. Weird problem.

[tiangolo]

Thanks for the help here @kousikmitra ! 👏 🙇

Thanks for reporting back and closing the issue @enbermudas 👍