向 OpenAI API 发起请求

使用 OpenAI API

James Chapman

Curriculum Manager, DataCamp

API 端点

一台计算机通过多个接入点连接到 OpenAI，这些接入点再连接到不同服务器。

API 端点

一台计算机通过多个端点连接到 OpenAI，这些端点再连接到不同服务器。

API 端点

端点 → 为特定交互设计的 API 接入点

一条医院走廊，通向不同科室的多扇门。

API 认证

认证 → 控制对 API 端点服务的访问（常用唯一密钥）

一条医院走廊，通向不同科室的多扇门。

API 使用成本

针对 OpenAI API：
- 模型
- 输入与输出越大，费用越高

本课程无额外费用 🎉

一条收费公路。

¹ https://openai.com/pricing

创建 API 密钥

本课程中不需要

创建账户 → https://platform.openai.com/signup
前往 API 密钥页面 → https://platform.openai.com/account/api-keys
新建密钥并复制

用于创建新密钥的按钮。

发起请求

from openai import OpenAI


client = OpenAI(api_key="ENTER YOUR KEY HERE")


response = client.chat.completions.create(

    model="gpt-4o-mini",

    messages=[{"role": "user", "content": "What is the OpenAI API?"}]

)


print(response)

响应对象

ChatCompletion(id='chatcmpl-AEcQbQekIzxcxVAKYVAjgUAXokgrl', choices=[Choice(finish_reason='length', index=0,
logprobs=None, message=ChatCompletionMessage(content='The OpenAI API is a cloud-based service provided by
OpenAI that allows developers to integrate advanced AI models into their applications.', refusal=None,
role='assistant', function_call=None, tool_calls=None))], created=1728047673, model='gpt-4o-mini-2024-07-18',
object='chat.completion', service_tier=None, system_fingerprint='fp_f85bea6784',
usage=CompletionUsage(completion_tokens=30, prompt_tokens=14, total_tokens=44,
prompt_tokens_details={'cached_tokens': 0}, completion_tokens_details={'reasoning_tokens': 0}))

响应对象

ChatCompletion(id='chatcmpl-AEcQbQekIzxcxVAKYVAjgUAXokgrl',
               choices=[Choice(finish_reason='length', index=0, logprobs=None,
                               message=ChatCompletionMessage(content='The OpenAI API is a cloud-based service
                               provided by OpenAI that allows developers to integrate advanced AI models
                               into their applications.',
                               refusal=None, role='assistant', function_call=None, tool_calls=None))],
               created=1728047673,
               model='gpt-4o-mini-2024-07-18',
               object='chat.completion', service_tier=None, system_fingerprint='fp_f85bea6784',
               usage=CompletionUsage(completion_tokens=25, prompt_tokens=14, total_tokens=39,
                                     prompt_tokens_details={'cached_tokens': 0},
                                     completion_tokens_details={'reasoning_tokens': 0}))

解读响应

print(response.choices)

[Choice(finish_reason='length', index=0, logprobs=None,
 message=ChatCompletionMessage(content='The OpenAI API is a cloud-based service provided by
 OpenAI that allows developers to integrate advanced AI models into their applications.',
 refusal=None, role='assistant', function_call=None, tool_calls=None))]

解读响应

print(response.choices[0])

Choice(finish_reason='length', index=0, logprobs=None,
 message=ChatCompletionMessage(content='The OpenAI API is a cloud-based service provided by
 OpenAI that allows developers to integrate advanced AI models into their applications.',
 refusal=None, role='assistant', function_call=None, tool_calls=None))

解读响应

print(response.choices[0].message)

ChatCompletionMessage(content='The OpenAI API is a cloud-based service provided by
 OpenAI that allows developers to integrate advanced AI models into their applications.',
 refusal=None, role='assistant', function_call=None, tool_calls=None)

print(response.choices[0].message.content)

The OpenAI API is a cloud-based service provided by OpenAI that allows developers to
integrate advanced AI models into their applications.

Passons à la pratique !

使用 OpenAI API