Password CLI Option and Confirmation Prompt

Apart from having a prompt, you can make a CLI option have a confirmation_prompt=True:

Python 3.7+Python 3.7+ non-Annotated

import typer
from typing_extensions import Annotated


def main(
    name: str,
    email: Annotated[str, typer.Option(prompt=True, confirmation_prompt=True)],
):
    print(f"Hello {name}, your email is {email}")


if __name__ == "__main__":
    typer.run(main)

Tip

Prefer to use the Annotated version if possible.

import typer


def main(
    name: str, email: str = typer.Option(..., prompt=True, confirmation_prompt=True)
):
    print(f"Hello {name}, your email is {email}")


if __name__ == "__main__":
    typer.run(main)

And the CLI program will ask for confirmation:

fast →python main.py Camila
💬 It prompts for the emailcamila@example.comcamila@example.com
Hello Camila, your email is camila@example.com

restart ↻

A Password prompt

When receiving a password, it is very common (in most shells) to not show anything on the screen while typing the password.

The program will still receive the password, but nothing will be shown on screen, not even ****.

You can achieve the same using hide_input=True.

And if you combine it with confirmation_prompt=True you can easily receive a password with double confirmation:

Python 3.7+Python 3.7+ non-Annotated

import typer
from typing_extensions import Annotated


def main(
    name: str,
    password: Annotated[
        str, typer.Option(prompt=True, confirmation_prompt=True, hide_input=True)
    ],
):
    print(f"Hello {name}. Doing something very secure with password.")
    print(f"...just kidding, here it is, very insecure: {password}")


if __name__ == "__main__":
    typer.run(main)

Tip

Prefer to use the Annotated version if possible.

import typer


def main(
    name: str,
    password: str = typer.Option(
        ..., prompt=True, confirmation_prompt=True, hide_input=True
    ),
):
    print(f"Hello {name}. Doing something very secure with password.")
    print(f"...just kidding, here it is, very insecure: {password}")


if __name__ == "__main__":
    typer.run(main)

Check it:

fast →python main.py Camila
💬 It prompts for the password, but doesn't show anything when you type Password: $ Repeat for confirmation: $
💬 Let's imagine the password typed was "typerrocks"Hello Camila. Doing something very secure with password.
...just kidding, here it is, very insecure: typerrocks

restart ↻