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Python 使用 OpenAI 接入大模型:从配置到流式输出实战

  • 2026-02-05 01:03:19
Python 使用 OpenAI 接入大模型:从配置到流式输出实战

随着大模型 API 的普及,越来越多开发者希望在自己的 Python 项目中集成 AI 能力。但很多人卡在第一步:API Key 怎么配?为什么连不上?如何实现像 ChatGPT 那样的“逐字输出”效果?

今天,我们就手把手教你用 Python + OpenAI 官方 SDK,安全接入大模型(包括 OpenAI、DeepSeek、智谱等兼容接口),并实现流式响应


一、准备工作

1. 安装必要库

pip install openai python-dotenv
简要介绍:
    openai:官方 SDK,支持所有兼容 OpenAI 协议的模型python-dotenv:从.env文件加载配置,避免密钥硬编码

    2. 获取 API Key

        OpenAI 用户:前往 https://platform.openai.com/api-keysDeepSeek 用户:注册 https://www.deepseek.com,获取 API Key其他国产模型:如 Moonshot、智谱、百川等,均提供 OpenAI 兼容接口

        3. 创建 .env 配置文件(关键!)

        在项目根目录新建 .env 文件:

        # OpenAI 官方OPENAI_API_KEY=sk-xxxxxxxxxxxxxxxxOPENAI_API_BASE_URL=https://api.openai.com/v1# 或 DeepSeek(示例)OPENAI_API_KEY=sk-xxxxxxxxxxxxxxxxOPENAI_API_BASE_URL=https://api.deepseek.com/v1

        二、核心代码实现

        from openai import OpenAIimport osfrom dotenv import load_dotenv# 加载 .env 文件中的环境变量load_dotenv()def get_response(prompt):    """普通请求模式"""    print(f"加载 api_key :{os.getenv('OPENAI_API_KEY')}")    client = OpenAI(        api_key=os.getenv("OPENAI_API_KEY"),        base_url=os.getenv("OPENAI_API_BASE_URL")    )    completion = client.chat.completions.create(        model="deepseek-chat",        messages=[            {"role""system""content""You are a helpful assistant."},            {"role""user""content": prompt},        ],        temperature=0.7,        max_tokens=256,    )    print("\n【完整回复】\n" + completion.choices[0].message.content)def get_response_stream(prompt):    """流式输出模式(逐字打印,体验更佳)"""    print(f"加载 api_key :{os.getenv('OPENAI_API_KEY')}")    client = OpenAI(        api_key=os.getenv("OPENAI_API_KEY"),        base_url=os.getenv("OPENAI_API_BASE_URL")    )    completion = client.chat.completions.create(        model="deepseek-chat",        stream=True,        messages=[            {"role""system""content""You are a helpful assistant."},            {"role""user""content": prompt},        ],    )    print("\n【流式输出】\n", end="")    for chunk in completion:        if chunk.choices[0].delta.content is not None:            print(chunk.choices[0].delta.content, end="", flush=True)    print("\n\n✅ 流式响应结束")    if __name__ == '__main__':    get_response_stream("请做一个简短的自我介绍,并说明你能帮助用户做什么。")

        运行结果

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        基本 文件 流程 错误 SQL 调试
        1. 请求信息 : 2026-02-08 02:41:55 HTTP/2.0 GET : https://f.mffb.com.cn/a/472421.html
        2. 运行时间 : 3.956065s [ 吞吐率:0.25req/s ] 内存消耗:4,445.73kb 文件加载:140
        3. 缓存信息 : 0 reads,0 writes
        4. 会话信息 : SESSION_ID=7a70bae12b39708a1483c0957e9a4abb
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        1. CONNECT:[ UseTime:0.000654s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
        2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000562s ]
        3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.100659s ]
        4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.100737s ]
        5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000870s ]
        6. SELECT * FROM `set` [ RunTime:0.100627s ]
        7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000643s ]
        8. SELECT * FROM `article` WHERE `id` = 472421 LIMIT 1 [ RunTime:0.100692s ]
        9. UPDATE `article` SET `lasttime` = 1770489715 WHERE `id` = 472421 [ RunTime:3.195180s ]
        10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.035991s ]
        11. SELECT * FROM `article` WHERE `id` < 472421 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.011955s ]
        12. SELECT * FROM `article` WHERE `id` > 472421 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.025127s ]
        13. SELECT * FROM `article` WHERE `id` < 472421 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.060710s ]
        14. SELECT * FROM `article` WHERE `id` < 472421 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.043614s ]
        15. SELECT * FROM `article` WHERE `id` < 472421 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.011047s ]
        3.960576s