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【跟着AI学Python】第23天:网络请求(requests)

  • 2026-02-23 13:35:03
【跟着AI学Python】第23天:网络请求(requests)

Qwen3-Max:

太棒了!欢迎来到 【跟着AI学Python】第23天!🎉今天我们将学习 用 Python 发起网络请求 —— 这是爬虫、API 调用、Web 自动化的基础!

💡 我们将使用 requests 库(Python 最流行的 HTTP 客户端),它简洁、强大、人性化!


🎯 第23天目标:

✅ 掌握 GET / POST 请求 的基本用法✅ 学会 获取并解析 JSON 数据(如调用天气 API)✅ 理解 响应状态码、头部、内容 的处理✅ 实战:获取实时天气信息

⚠️ 前提:已安装 requests(若未安装,请先执行 pip install requests


📘 一、安装与导入

# 在虚拟环境中安装(推荐)$ pip install requests
import requests

📘 二、GET 请求:获取数据

🔹 基本语法

response = requests.get(url, params=query_params, headers=headers)

🔹 示例:获取网页内容

# 1. 最简单的 GETres = requests.get("https://httpbin.org/get")print(res.status_code)  # 200 → 成功!print(res.text)         # 响应的文本内容

🔹 带参数的 GET(查询字符串)

# 请求: https://httpbin.org/get?name=Alice&age=25params = {"name""Alice""age"25}res = requests.get("https://httpbin.org/get"params=params)print(res.url)  # 查看实际请求的 URL

📘 三、POST 请求:提交数据

🔹 基本语法

response = requests.post(url, data=form_data, json=json_data, headers=headers)

🔹 示例:提交表单 or JSON

# 1. 提交表单数据 (application/x-www-form-urlencoded)form_data = {"username""alice""password""123456"}res = requests.post("https://httpbin.org/post", data=form_data)# 2. 提交 JSON 数据 (application/json)json_data = {"user""alice""action""login"}res = requests.post("https://httpbin.org/post", json=json_data)print(res.json())  # 直接解析返回的 JSON

✅ 关键区别

  • data=→ 发送表单(字典会被 urlencode)
  • json=→ 自动设置 Content-Type: application/json并序列化

📘 四、解析响应内容

属性/方法
说明
.status_code
HTTP 状态码(200=成功,404=未找到,500=服务器错误)
.headers
响应头(字典)
.text
响应的文本内容(自动解码)
.content
响应的原始字节(用于下载图片/文件)
.json()将 JSON 响应解析为 Python 字典/列表

🔹 安全解析 JSON(带异常处理)

try:    data = res.json()except requests.exceptions.JSONDecodeError:    print("❌ 响应不是有效的 JSON!")    print("原始内容:", res.text)

🌤️ 五、实战:获取实时天气(使用免费 API)

我们将使用 Open-Meteo(无需 API Key,免费公开):

  • 文档:https://open-meteo.com/
  • 接口:https://api.open-meteo.com/v1/forecast

🔹 步骤:

  1. 构造请求 URL(带经纬度)
  2. 发送 GET 请求
  3. 解析 JSON 获取温度、天气描述
  4. 友好输出

🔹 代码实现

# 【跟着AI学Python】第23天:网络请求(requests)import requestsdef get_weather(lat=39.9042, lon=116.4074, city="北京"):    """    获取指定城市的当前天气    默认:北京 (纬度 39.9042, 经度 116.4074)    """    url = "https://api.open-meteo.com/v1/forecast"    params = {        "latitude": lat,        "longitude": lon,        "current_weather""true",        "timezone""Asia/Shanghai"    }     try:        response = requests.get(url, params=params, timeout=10)        response.raise_for_status()  # 如果状态码不是 2xx,抛出异常        data = response.json()        current = data["current_weather"]        print(f"🌤️  {city} 当前天气:")        print(f"   温度: {current['temperature']}°C")        print(f"   风速: {current['windspeed']} km/h")        print(f"   天气代码: {current['weathercode']} (参考: https://open-meteo.com/en/docs)")         except requests.exceptions.RequestException as e:        print(f"❌ 网络请求失败: {e}")    except KeyError as e:        print(f"❌ 响应数据格式异常: 缺少字段 {e}")# 使用示例if __name__ == "__main__":    get_weather()  # 北京    get_weather(31.2304121.4737"上海")    get_weather(23.1291113.2644"广州")

📘 六、高级技巧(了解即可)

🔹 添加请求头(模拟浏览器)

headers = {    "User-Agent""Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36"}res = requests.get("https://example.com", headers=headers)

🔹 下载文件

res = requests.get("https://example.com/image.jpg")with open("image.jpg""wb"as f:    f.write(res.content)  # .content 是字节

🔹 会话保持(Session)

session = requests.Session()session.get("https://example.com/login")  # 自动处理 Cookiesession.post("https://example.com/data")  # 后续请求携带 Cookie

✅ 今日小任务

1、用 GET 请求获取 https://httpbin.org/json 的 JSON 数据,并打印其中的 "slideshow" 标题
2、用 POST 请求向 https://httpbin.org/post 发送 JSON {"task": "learn Python"},并打印响应中的 json 字段
import requests# === 任务1:GET ===print("【任务1】")res1 = requests.get("https://httpbin.org/json")print("标题:", res1.json()["slideshow"]["title"])# === 任务2:POST ===print("\n【任务2】")payload = {"task""learn Python"}res2 = requests.post("https://httpbin.org/post", json=payload)print("服务器收到:", res2.json()["json"])

📝 小结:requests 核心用法

场景
代码模板
GET 带参数requests.get(url, params={...})
POST 表单requests.post(url, data={...})
POST JSONrequests.post(url, json={...})
解析 JSONresponse.json()
错误处理try-except
 + response.raise_for_status()

✅ 黄金法则

  • 永远检查 status_code 或使用 raise_for_status()
  • 敏感操作加 timeout 防止卡死
  • 不要硬编码 API Key 到代码中(用环境变量)

🎉 恭喜完成第23天!你已掌握 与 Web 世界交互的核心技能,能轻松调用各种 API!

继续加油,你的 Python 已经能连接整个互联网了!🌐🐍

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  1. CONNECT:[ UseTime:0.000898s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001417s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.026837s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.004287s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000702s ]
  6. SELECT * FROM `set` [ RunTime:0.000215s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000625s ]
  8. SELECT * FROM `article` WHERE `id` = 476473 LIMIT 1 [ RunTime:0.001566s ]
  9. UPDATE `article` SET `lasttime` = 1772247190 WHERE `id` = 476473 [ RunTime:0.000601s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000283s ]
  11. SELECT * FROM `article` WHERE `id` < 476473 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.003677s ]
  12. SELECT * FROM `article` WHERE `id` > 476473 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.004833s ]
  13. SELECT * FROM `article` WHERE `id` < 476473 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.031892s ]
  14. SELECT * FROM `article` WHERE `id` < 476473 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.004556s ]
  15. SELECT * FROM `article` WHERE `id` < 476473 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.030586s ]
0.261164s