命令 CLI 选项

命令还可以有自己的CLI 选项。

事实上，每个命令都可以有不同的CLI 参数和CLI 选项

Python 3.7+Python 3.7+ 非注释

import typer
from typing_extensions import Annotated

app = typer.Typer()


@app.command()
def create(username: str):
    print(f"Creating user: {username}")


@app.command()
def delete(
    username: str,
    force: Annotated[
        bool, typer.Option(prompt="Are you sure you want to delete the user?")
    ],
):
    if force:
        print(f"Deleting user: {username}")
    else:
        print("Operation cancelled")


@app.command()
def delete_all(
    force: Annotated[
        bool, typer.Option(prompt="Are you sure you want to delete ALL users?")
    ],
):
    if force:
        print("Deleting all users")
    else:
        print("Operation cancelled")


@app.command()
def init():
    print("Initializing user database")


if __name__ == "__main__":
    app()

提示

如果可能，最好使用Annotated版本。

import typer

app = typer.Typer()


@app.command()
def create(username: str):
    print(f"Creating user: {username}")


@app.command()
def delete(
    username: str,
    force: bool = typer.Option(..., prompt="Are you sure you want to delete the user?"),
):
    if force:
        print(f"Deleting user: {username}")
    else:
        print("Operation cancelled")


@app.command()
def delete_all(
    force: bool = typer.Option(
        ..., prompt="Are you sure you want to delete ALL users?"
    ),
):
    if force:
        print("Deleting all users")
    else:
        print("Operation cancelled")


@app.command()
def init():
    print("Initializing user database")


if __name__ == "__main__":
    app()

这里我们有多个命令，具有不同的CLI 参数

• create:
  • username：一个CLI 参数。
• delete:
  • username：一个CLI 参数。
  • --force：一个CLI 选项，如果没有提供，则会提示。
• delete-all:
  • --force：一个CLI 选项，如果没有提供，则会提示。
• init:
  • 不接受任何CLI 参数。

// Check the help
python main.py --help

Usage: main.py [OPTIONS] COMMAND [ARGS]...

Options:
  --install-completion  Install completion for the current shell.
  --show-completion     Show completion for the current shell, to copy it or customize the installation.
  --help                Show this message and exit.

Commands:
  create
  delete
  delete-all
  info

提示

检查命令delete-all，默认情况下，命令名称会从函数名称生成，用 - 替换 _。

测试它

// Check the command create
$ python main.py create Camila

Creating user: Camila

// Now test the command delete
$ python main.py delete Camila

# Are you sure you want to delete the user? [y/n]: $ y

Deleting user: Camila

$ python main.py delete Wade

# Are you sure you want to delete the user? [y/n]: $ n

Operation cancelled

// And finally, the command delete-all
// Notice it doesn't have CLI arguments, only a CLI option

$ python main.py delete-all

# Are you sure you want to delete ALL users? [y/n]: $ y

Deleting all users

$ python main.py delete-all

# Are you sure you want to delete ALL users? [y/n]: $ n

Operation cancelled

// And if you pass the --force CLI option, it doesn't need to confirm

$ python main.py delete-all --force

Deleting all users

// And init that doesn't take any CLI parameter
$ python main.py init

Initializing user database