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Python 调用 deepseek-v4-flash 完整示例（含流式输出）

作者：

admin

在

环境准备

pip install openai

基础调用

from openai import OpenAI

client = OpenAI(
    api_key="你的KEY",
    base_url="https://api.ns666.cfd/v1",
)

resp = client.chat.completions.create(
    model="deepseek-v4-flash",
    messages=[
        {"role": "system", "content": "你是一个简洁的助手"},
        {"role": "user", "content": "用一句话解释什么是 API 网关"},
    ],
    temperature=0.7,
    max_tokens=500,
)
print(resp.choices[0].message.content)
print("用量:", resp.usage)

流式输出

流式输出能让首字更快显示，适合对话类应用。

stream = client.chat.completions.create(
    model="deepseek-v4-flash",
    messages=[{"role": "user", "content": "写一首关于秋天的短诗"}],
    stream=True,
)

for chunk in stream:
    if chunk.choices and chunk.choices[0].delta.content:
        print(chunk.choices[0].delta.content, end="", flush=True)

带重试的健壮封装

import time
from openai import OpenAI, APIError, APIConnectionError

client = OpenAI(api_key="你的KEY", base_url="https://api.ns666.cfd/v1")

def chat(messages, model="deepseek-v4-flash", retries=3):
    for i in range(retries):
        try:
            resp = client.chat.completions.create(
                model=model, messages=messages, timeout=60,
            )
            return resp.choices[0].message.content
        except (APIConnectionError, APIError) as e:
            if i == retries - 1:
                raise
            time.sleep(2 ** i)
    return None

print(chat([{"role": "user", "content": "你好"}]))

注意事项

  • 接口地址必须是 https://api.ns666.cfd/v1，末尾不要加斜杠
  • Key 不要硬编码在代码里，用环境变量读取
  • 长文本建议开启流式，避免超时

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