First Check

• I added a very descriptive title to this issue.
• I used the GitHub search to find a similar issue and didn't find it.
• I searched the Typer documentation, with the integrated search.
• I already searched in Google "How to X in Typer" and didn't find any information.
• I already read and followed all the tutorial in the docs and didn't find an answer.
• I already checked if it is not related to Typer but to Click.

Example Code

import typer

app = typer.Typer(result_callback=lambda x: print(x))

@app.command()
def main() -> str:
    return "foo"

if __name__ == "__main__":
    app()

Description

• Create a Typed instance
• Have only a single @app.command()
• Call the file on the CLI without using the command's name, ie python test.py rather than python test.py main
• The result_callback is not called. In the example above, that means nothing is printed to stdout.

Operating System

Linux

Operating System Details

Ubuntu 20.10

Typer Version

0.6.1

Python Version

3.9.5