请对你上面写的这个代码进行注释

好的，下面对代码进行注释：

import openai
import re

# 定义 OpenAI API key
openai.api_key = "YOUR_API_KEY"

# 定义模型 ID
model_engine = "text-davinci-002"

# 定义问题和上下文
question = "What is the capital of France?"
context = "France is a country located in Western Europe."

# 定义生成对话的参数
completion = openai.Completion.create(
    engine=model_engine,
    prompt=(f"Q: {question}\n"
            f"A:"),
    max_tokens=100,
    n=1,
    stop=None,
    temperature=0.5,
    frequency_penalty=0,
    presence_penalty=0
)

# 提取回答
answer = completion.choices[0].text.strip()

# 清除回答中多余的字符
cleaned_answer = re.sub('[^0-9a-zA-Z.,!?/:;\"\'\s]+', '', answer)

# 打印回答
print(cleaned_answer)

注释如下：

1. `import openai` - 导入 OpenAI Python SDK。
2. `import re` - 导入 Python 的正则表达式模块。
3. `openai.api_key = "YOUR_API_KEY"` - 设置 OpenAI API key。
4. `model_engine = "text-davinci-002"` - 定义使用的模型 ID。
5. `question = "What is the capital of France?"` - 定义问题。
6. `context = "France is a country located in Western Europe."` - 定义上下文。
7. `completion = openai.Completion.create(...)` - 创建生成对话的 API 请求。
8. `answer = completion.choices[0].text.strip()` - 从 API 响应中提取回答。
9. `cleaned_answer = re.sub('[^0-9a-zA-Z.,!?/:;\"\'\s]+', '', answer)` - 清除回答中多余的字符。
10. `print(cleaned_answer)` - 打印回答。