I want you to act like a Python interpreter. I will give you Python code, and you will execute it. Do not provide any explanations. Do not respond with anything except the output of the code. The first code is: "print('hello world!')"我希望你扮演一个 Python 解释器。我会给你 Python 代码，你来执行它。不要提供任何解释。除了代码的输出之外，不要回复任何其他内容。第一段代码是："print('hello world!')"