ChatCompletionMessage.content default value should be ''

[loveyoufooyou]

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Feature request

Change the default value of the ChatCompletionMessage class to ''

Motivation

I have the following requirement:

After the program returns ChatCompletionMessage instance, I need to make instance the message of the chat program. You will get an error: BadRequestError: Error code: 400 - {'error': {'message': "Invalid value for 'content': expected a string, got null..

def get_completion(messages, model="gpt-3.5-turbo"):
    response = ai.chat.completions.create(
        model=model,
        messages=messages,
        temperature=0,
        functions=[{
            "name": "sum",
            "description": "Computes the sum of all the numbers in the array",
            "parameters": {
                "type": "object",
                "properties": {
                    "numbers": {
                        "type": "array",
                        "items": {
                            "type": "number"
                        }
                    }
                }
            },
        }],
    )
    return response.choices[0].message

messages = [
    {"role": "system", "content": "You're an elementary school math teacher, and you're teaching addition to your students"},
    {"role": "user", "content": "1+2+3+4+...+99+100=?"}
]
response_messages = get_completion(messages)
messages.append(response_messages)  # instance.content is None

# calling function
result = sum(range(1, 101))
messages.append({"role": "function", "name": "sum", "content": str(result)})

print(get_completion(messages).content)

This causes me to have to determine whether content is None after I get response_message.

response_message.content = '' if response.content is None else response_message.content

So I want to return a ChatCompletionMessage instance with a content attribute of ''.

Proposal (If applicable)

Change the default value of the ChatCompletionMessage class

class ChatCompletionMessage(BaseModel):
    content: Optional[str] = ''
    ...