# typer 命令行扩展,依赖click ## Usage ``` import typer app = typer.Typer() @app.command() def greet(name: str): """Greet the user by NAME.""" typer.echo(f"Hello, {name}!") @app.command() def add(a: int, b: int): """Add two numbers.""" result = a + b typer.echo(f"The sum of {a} and {b} is {result}.") if __name__ == "__main__": # 使用括号 () 调用一个对象时,实际上是在调用该对象的 __call__ 方法。这种设计允许对象表现得像函数 app() ``` 命令行执行: ``` python script.py greet John python script.py add 1 3 ``` 把第一个参数识别为命令,后面的识别为参数