不一致机器人的命令不起作用(Python)

class Robot:
    def __init__(self):
        self.state = "idle"

    def process_command(self, command):
        parts = command.split()
        if not parts:
            return "No command provided."

        action = parts[0].lower()
        if action == "start":
            if self.state == "idle":
                self.state = "running"
                return "Robot started."
            else:
                return "Robot is already running."
        elif action == "stop":
            if self.state == "running":
                self.state = "idle"
                return "Robot stopped."
            else:
                return "Robot is not running."
        else:
            return f"Unknown command: {action}"

# 示例使用
robot = Robot()
print(robot.process_command("start"))  # 输出: Robot started.
print(robot.process_command("start"))  # 输出: Robot is already running.
print(robot.process_command("stop"))   # 输出: Robot stopped.
print(robot.process_command("stop"))   # 输出: Robot is not running.
print(robot.process_command("jump"))   # 输出: Unknown command: jump