将以上代码整合到一起

好的，以下是整合后的代码：

import openai
import json

openai.api_key = "YOUR_API_KEY"

def generate_text(prompt):
    response = openai.Completion.create(
        engine="davinci",
        prompt=prompt,
        temperature=0.5,
        max_tokens=1024,
        top_p=1,
        frequency_penalty=0,
        presence_penalty=0
    )

    if "choices" in response:
        return response.choices[0].text
    else:
        return ""

def chit_chat(prompt):
    response = generate_text(prompt)
    return response.strip()

while True:
    user_input = input("You: ")
    if user_input.lower() == "bye":
        print("ChitGPT: Goodbye!")
        break
    response = chit_chat(user_input)
    print("ChitGPT: " + response)

请注意替换`YOUR_API_KEY`为您的OpenAI API密钥。