基于默认参数在Python字典中映射命令

def greet(name="World"):
    return f"Hello, {name}!"

def add(a, b):
    return a + b

def subtract(a, b):
    return a - b

def default_command(*args, **kwargs):
    return "Unknown command"

commands = {
    "greet": greet,
    "add": add,
    "subtract": subtract
}

def execute_command(command_name, *args, **kwargs):
    # 获取命令对应的函数，如果命令不存在则使用默认函数
    command_function = commands.get(command_name, default_command)
    # 执行命令函数并返回结果
    return command_function(*args, **kwargs)

if __name__ == "__main__":
    print(execute_command("greet", "Alice"))  # 输出: Hello, Alice!
    print(execute_command("add", 5, 3))       # 输出: 8
    print(execute_command("subtract", 10, 4)) # 输出: 6
    print(execute_command("multiply", 2, 3))  # 输出: Unknown command