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Typer
typer.tiangolo.com › tutorial › arguments › help
CLI Arguments with Help - Typer
You can use the help parameter to add a help text for a CLI argument: Python 3.10+ from typing import Annotated import typer app = typer.Typer() @app.command() def main(name: Annotated[str, typer.Argument(help="The name of the user to greet")]): print(f"Hello {name}") if __name__ == "__main__": app() 🤓 Other versions and variants ·
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Typer
typer.tiangolo.com › tutorial › multiple-values › arguments-with-multiple-values
CLI Arguments with Multiple Values - Typer
You can define the type of a CLI argument using list. Python 3.10+ from pathlib import Path import typer app = typer.Typer() @app.command() def main(files: list[Path], celebration: str): for path in files: if path.is_file(): print(f"This file exists: {path.name}") print(celebration) if __name__ == "__main__": app() And then you can pass it as many CLI arguments of that type as you want: $ uv run python main.py ./index.md ./first-steps.md woohoo!
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Jacob Kaplan-Moss
jacobian.org › til › common-arguments-with-typer
Common Arguments With Typer - Jacob Kaplan-Moss
import typer from types import SimpleNamespace cli = typer.Typer() @cli.callback() def main( ctx: typer.Context, pinboard_token: str = typer.Option(None, envvar="PINBOARD_TOKEN"), ): if not pinboard_token: print( "Missing pinboard token; pass --pinboard-token or set env[PINBOARD_TOKEN]" ) raise typer.Exit(1) ctx.obj = SimpleNamespace(pinboard_token = pinboard_token) @cli.command() def all(ctx: typer.Context): # do something with ctx.obj.pinboard_token @cli.command() def new(ctx: typer.Context): # do something with ctx.obj.pinboard_token if __name__ == "__main__": cli()
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Typer
typer.tiangolo.com › tutorial › arguments › optional
Optional CLI Arguments - Typer
As we no longer have the Python function default value (or its absence) to tell if something is required or not and what is the default value, typer.Argument() receives a first parameter default that serves the same purpose of defining that default value, or making it required.
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Typer
typer.tiangolo.com › tutorial › arguments
CLI Arguments - Typer
We'll create optional CLI arguments, we'll add integrated help for CLI arguments, etc.
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Typer
typer.tiangolo.com › tutorial › commands › arguments
Command CLI Arguments - Typer
The same way as with a CLI application with a single command, subcommands (or just "commands") can also have their own CLI arguments: Python 3.10+ import typer app = typer.Typer() @app.command() def create(username: str): print(f"Creating user: {username}") @app.command() def delete(username: str): print(f"Deleting user: {username}") if __name__ == "__main__": app() // Check the help for create $ uv run python main.py create --help Usage: main.py create [OPTIONS] {username} Arguments: username [required] Options: --help Show this message and exit.
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Calmcode
calmcode.io › course › typer › options
Calmcode - typer: Options
import typer from typing import List from pathlib import Path app = typer.Typer(name="demo", add_completion=False, help="This is a demo app.") @app.command() def talk(text: str = typer.Argument(..., help="The text to type."), repeat: int = typer.Option(1, help="Number of times to repeat."), loud: bool = typer.Option(False, is_flag=True)): """Talks some text below""" if loud: text = text.upper() for _ in range(repeat): print(text) if __name__ == "__main__": app() The talk command can be run in multiple ways now. python cli.py talk "hello there" python cli.py talk "hello there" --repeat 2 python cli.py talk "hello there" --loud python cli.py talk "hello there" --loud --repeat 3
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Calmcode
calmcode.io › course › typer › arguments
Calmcode - typer: Arguments
import typer from typing import List from pathlib import Path app = typer.Typer(name="demo", add_completion=False, help="This is a demo app.") @app.command() def hello_world(name): """Say hello""" print(f"hello {name}!") @app.command() def goodbye_world(name): """Say goodbye""" print(f"goodbye {name}!") @app.command() def add(n1: int = typer.Argument(..., help="An integer"), n2: int = typer.Argument(1, help="An integer")): """Add two numbers""" print(n1 + n2) if __name__ == "__main__": app() By adding the argument information we should now see a help text appear for each input but we should now also see proper addition taking place instead of string concatenation. python cli.py add --help python cli.py add 1 1 ·
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Typer
typer.tiangolo.com › reference › parameters
Parameters - Typer - Tiangolo.com
**Example** ```python def name_callback(value: str): if value != "Deadpool": raise typer.BadParameter("Only Deadpool is allowed") return value @app.command() def main(name: Annotated[str, typer.Argument(callback=name_callback)]): print(f"Hello {name}") ``` """ ), ] = None, metavar: Annotated[ str | None, Doc( """ Customize the name displayed in the help text to represent this CLI Argument.
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Typer
typer.tiangolo.com › tutorial › arguments › default
CLI Arguments with Default - Typer
That way the CLI argument will be optional and also have a default value. We can also use typer.Argument() to make a CLI argument have a default value other than None:
Find elsewhere
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Typer
typer.tiangolo.com › tutorial › parameter-types › custom-types
Custom Types - Typer
typer.Argument and typer.Option can create custom parameter types with a parser callable. Python 3.10+ from typing import Annotated import typer class CustomClass: def __init__(self, value: str): self.value = value def __str__(self): return f"<CustomClass: value={self.value}>" def ...
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Stack Overflow
stackoverflow.com › questions › 76555213 › how-do-i-pass-all-arguments-in-typer-to-a-command
python - How do I pass all arguments in typer to a command? - Stack Overflow
Top answer
1 of 1
3

I went through many iterations before I figured it out. In banana.py:

from typing import List, Optional
import docker
import typer
from typing_extensions import Annotated

@app.callback(invoke_without_command=True)
def main(commands: Annotated[Optional[List[str]], typer.Argument()] = None) -> None:
    # run the banana command with all arguments
    client = docker.from_env()
    client.containers.run(image, commands)

The above code (fully typed!) means I can run commands like the following:

mycli banana
mycli banana arg1
mycli banana arg1 arg2 arg3

and it all works as expected!

Suggestions for improvement would be greatly appreciated.

NB. This question is similar to this one but is not quite the same. And this issue was helpful too.

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Typer
typer.tiangolo.com › tutorial › options › name
CLI Option Name - Typer
In Typer you can also define CLI option short names the same way you can customize the long names. You can pass positional arguments to typer.Option() to define the CLI option name(s).
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Typer
typer.tiangolo.com › tutorial › arguments › envvar
CLI Arguments with Environment Variables - Typer
Wednesday // Try the second env var $ GOD_NAME=Anubis uv run python main.py Hello Mr. Anubis · By default, environment variables used will be shown in the help text, but you can disable them with show_envvar=False: ... from typing import Annotated import typer app = typer.Typer() @app.command() def main( name: Annotated[ str, typer.Argument(envvar="AWESOME_NAME", show_envvar=False) ] = "World", ): print(f"Hello Mr.
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Readthedocs
cyclopts.readthedocs.io › en › v3.0.0 › vs_typer › argument_vs_option › README.html
Argument vs Option - Cyclopts - Read the Docs
In Typer, the actual difference between the Argument and Option classes aren't very clear. Generally, it can be said that: Arguments are required and provided as positional arguments. Options are optional and are provided as keyword arguments, generally preceded with a --. With more modern ...
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Typer
typer.tiangolo.com › tutorial › options › help
CLI Options with Help - Typer
You already saw how to add a help text for CLI arguments with the help parameter. Let's now do the same for CLI options: Python 3.10+ from typing import Annotated import typer app = typer.Typer() @app.command() def main( name: str, lastname: Annotated[str, typer.Option(help="Last name of person to greet.")] = "", formal: Annotated[bool, typer.Option(help="Say hi formally.")] = False, ): """ Say hi to 'name', optionally with a --lastname.
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Typer
typer.tiangolo.com › tutorial › parameter-types
CLI Parameter Types - Typer
In this example, the value received for the CLI argument name will be treated as str. The value for the CLI option --age will be converted to an int and --height-meters will be converted to a float. And as female is a bool CLI option, Typer will convert it to a "flag" --female and the counterpart --no-female. ... $ uv run python main.py --help // Notice how --age is an 'int' (integer) and --height-meters is a 'float' Usage: main.py [OPTIONS] {name} Arguments: name [required] Options: --age <int> [default: 20] --height-meters <float> [default: 1.89] --female / --no-female [default: female] --help Show this message and exit.
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GitHub
github.com › fastapi › typer › blob › master › docs › tutorial › arguments › optional.md
typer/docs/tutorial/arguments/optional.md at master · fastapi/typer
As we no longer have the Python function default value (or its absence) to tell if something is required or not and what is the default value, typer.Argument() receives a first parameter default that serves the same purpose of defining that default value, or making it required.
Author: fastapi
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Medium
medium.com › @hayata-yamamoto › introduction-to-typer-a-powerful-cli-tool-for-python-developers-780c9fd87c19
Introduction to Typer: A Powerful CLI Tool for Python Developers | by Hayata Yamamoto | Medium
June 5, 2025 - import time from typing import Optional import typer from rich import print, progress, prompt app = typer.Typer() # Callback definition: https://typer.tiangolo.com/tutorial/commands/callback/ @app.callback(help="App callback definition") def callback( arg1: str = typer.Argument(..., help="Required argument for the entire app"), option1: bool = typer.Option(default=False, help="Optional argument for the entire app"), ) -> None: print(f"{arg1=}") print(f"{option1=}") # Required arguments: https://typer.tiangolo.com/tutorial/commands/arguments/… ·
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Typer
typer.tiangolo.com › tutorial › options › required
Required CLI Options - Typer
Python 3.10+ - non-Annotated · Tip · Prefer to use the Annotated version if possible. import typer app = typer.Typer() @app.command() def main(name: str, lastname: str = typer.Option()): print(f"Hello {name} {lastname}") if __name__ == "__main__": app() The same way as with typer.Argument(), the old style of using the function parameter default value is also supported, in that case you would just not pass anything to the default parameter.