给出以上代码修改后的完整代码

以下是修改后的完整代码：

import openai
import re

# replace with your own OpenAI API key
openai.api_key = "YOUR_API_KEY_HERE"

# define regex pattern to match prompt endings
prompt_end_pattern = r"[.?!][\s\"\']*$"

# define function to generate response from GPT
def generate_response(prompt):
    # remove any trailing punctuation or whitespace from prompt
    prompt = re.sub(prompt_end_pattern, "", prompt)

    # set GPT parameters
    model_engine = "text-davinci-002"
    max_tokens = 50
    temperature = 0.7

    # generate response from GPT
    response = openai.Completion.create(
        engine=model_engine,
        prompt=prompt,
        max_tokens=max_tokens,
        temperature=temperature,
        n=1,
        stop=None,
        frequency_penalty=0,
        presence_penalty=0
    )

    # return GPT's response text
    return response.choices[0].text.strip()

# define function to start conversation with user
def start_conversation():
    # initialize empty prompt and response
    prompt = ""
    response = ""

    # continue conversation until user ends it
    while True:
        # get user input
        user_input = input(prompt + response).strip()

        # end conversation if user inputs "bye" or "goodbye"
        if user_input.lower() in ["bye", "goodbye"]:
            print("Goodbye!")
            break

        # add user input to prompt
        prompt += user_input

        # generate response from GPT
        response = generate_response(prompt)

        # add GPT's response to prompt
        prompt += response

        # print GPT's response
        print(response)

# start conversation with user
start_conversation()

请注意，你需要将 `YOUR_API_KEY_HERE` 替换为你自己的 OpenAI API 密钥。此外，你也可以更改默认的 GPT 参数以调整生成的响应的质量和风格。