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Python requests模块详细介绍

  • 2026-02-27 03:29:36
Python requests模块详细介绍

1. 创始时间与作者

  • 创始时间requests 库首次发布于 2011年2月(首个版本 v0.2.0)

  • 核心开发者

    • Kenneth Reitz:requests 库的创始人和主要开发者,致力于让HTTP请求对人类更友好

    • 开源社区贡献:由全球数百名开发者共同维护和优化

    • Python Software Foundation:现在由PSF维护

  • 项目定位:简单优雅的HTTP库,让HTTP请求对人类更友好

2. 官方资源

  • GitHub 地址https://github.com/psf/requests

  • PyPI 地址https://pypi.org/project/requests/

  • 文档地址https://docs.python-requests.org/

  • 官方主页https://python-requests.org

3. 核心功能

4. 应用场景

1. 基础HTTP请求
import requests# GET请求 - 获取数据response = requests.get('https://api.github.com')print(f"状态码: {response.status_code}")print(f"响应头: {dict(response.headers)}")print(f"响应内容: {response.text[:200]}...")# 带参数的GET请求params = {'q''python''page'1'per_page'10}response = requests.get('https://api.github.com/search/repositories'params=params)data = response.json()print(f"找到 {data['total_count']} 个仓库")# POST请求 - 提交数据data = {'username''testuser''password''testpass'}response = requests.post('https://httpbin.org/post'data=data)print(f"POST响应: {response.json()}")# 带JSON数据的POST请求json_data = {'name''John''age'30'city''New York'}response = requests.post('https://httpbin.org/post'json=json_data)print(f"JSON POST响应: {response.json()}")
2. 高级请求处理
import requestsimport jsondef advanced_requests_demo():"""高级请求功能演示"""# 自定义请求头headers = {'User-Agent''Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36','Accept''application/json','Authorization''Bearer your-token-here'    }# 带超时设置try:response = requests.get('https://httpbin.org/delay/5'headers=headers,timeout=3# 3秒超时        )except requests.exceptions.Timeout:print("请求超时!")return# 文件上传files = {'file': ('test.txt'open('test.txt''rb'), 'text/plain'),'image': ('image.jpg'open('image.jpg''rb'), 'image/jpeg')    }response = requests.post('https://httpbin.org/post'files=files)print(f"文件上传响应: {response.json()}")# 流式下载大文件response = requests.get('https://httpbin.org/stream/100'stream=True)for iline in enumerate(response.iter_lines()):if i>5:  # 只显示前5行breakif line:print(f"流式数据 {i}: {line.decode('utf-8')}")# 运行示例advanced_requests_demo()
3. 会话管理与Cookie处理
import requestsclass WebSessionManager:"""Web会话管理器"""def __init__(self):self.session = requests.Session()# 设置默认请求头self.session.headers.update({'User-Agent''Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36','Accept''application/json'        })def login(selfusernamepassword):"""模拟登录"""login_data = {'username'username,'password'password        }response = self.session.post('https://httpbin.org/post',data=login_data        )if response.status_code == 200:print("登录成功")# 保存登录后的Cookieself.save_cookies()return Truereturn Falsedef save_cookies(self):"""保存Cookie到文件"""import picklewith open('cookies.pkl''wb'as f:pickle.dump(self.session.cookiesf)print("Cookie已保存")def load_cookies(self):"""从文件加载Cookie"""import pickletry:with open('cookies.pkl''rb'as f:self.session.cookies.update(pickle.load(f))print("Cookie已加载")return Trueexcept FileNotFoundError:print("未找到Cookie文件")return Falsedef get_protected_resource(selfurl):"""获取需要认证的资源"""response = self.session.get(url)if response.status_code == 200:return response.json()else:print(f"请求失败: {response.status_code}")return Nonedef close(self):"""关闭会话"""self.session.close()def session_demo():"""会话管理演示"""manager = WebSessionManager()try:# 模拟登录if manager.login('testuser''testpass'):# 使用会话访问多个资源resources = ['https://httpbin.org/cookies','https://httpbin.org/headers','https://httpbin.org/ip'            ]for resource in resources:data = manager.get_protected_resource(resource)if data:print(f"资源 {resource}: {data}")# 显示会话信息print(f"会话Cookie: {dict(manager.session.cookies)}")print(f"会话头信息: {dict(manager.session.headers)}")finally:manager.close()# 运行示例session_demo()
4. 错误处理与重试机制
import requestsfrom requests.adapters import HTTPAdapterfrom requests.packages.urllib3.util.retry import Retryimport timeclass RobustRequestClient:"""健壮的请求客户端"""def __init__(selfmax_retries=3backoff_factor=0.5):self.session = requests.Session()self.setup_retry_strategy(max_retriesbackoff_factor)def setup_retry_strategy(selfmax_retriesbackoff_factor):"""设置重试策略"""retry_strategy = Retry(total=max_retries,backoff_factor=backoff_factor,status_forcelist=[429500502503504],allowed_methods=["GET""POST""PUT""DELETE"]        )adapter = HTTPAdapter(max_retries=retry_strategy)self.session.mount("http://"adapter)self.session.mount("https://"adapter)def make_request(selfmethodurl**kwargs):"""发送请求并处理错误"""start_time = time.time()try:response = self.session.request(methodurl**kwargs)response.raise_for_status()  # 如果状态码不是200,抛出HTTPErrorend_time = time.time()print(f"请求成功: {method} {url} - 状态码: {response.status_code} - 耗时: {end_time - start_time:.2f}s")return responseexcept requests.exceptions.HTTPError as err:print(f"HTTP错误: {err}")except requests.exceptions.ConnectionError as err:print(f"连接错误: {err}")except requests.exceptions.Timeout as err:print(f"超时错误: {err}")except requests.exceptions.RequestException as err:print(f"请求异常: {err}")return Nonedef download_file(selfurlfilepathchunk_size=8192):"""下载文件并显示进度"""response = self.session.get(urlstream=True)if response.status_code == 200:total_size = int(response.headers.get('content-length'0))downloaded = 0with open(filepath'wb'as f:for chunk in response.iter_content(chunk_size=chunk_size):if chunk:f.write(chunk)downloaded += len(chunk)if total_size>0:progress = (downloaded/total_size*100print(f"下载进度: {progress:.1f}%"end='\r')print(f"\n文件下载完成: {filepath}")return Trueelse:print(f"下载失败: {response.status_code}")return Falsedef robust_client_demo():"""健壮客户端演示"""client = RobustRequestClient(max_retries=3)# 测试各种请求test_cases = [        ('GET''https://httpbin.org/status/200'),        ('GET''https://httpbin.org/status/404'),  # 会失败        ('GET''https://httpbin.org/status/500'),  # 会重试        ('POST''https://httpbin.org/post', {'data': {'test''value'}}),    ]for test_case in test_cases:methodurl = test_case[0], test_case[1]kwargs = test_case[2if len(test_case>else {}client.make_request(methodurl**kwargs)time.sleep(1)  # 避免请求过快# 运行示例robust_client_demo()

5. 底层逻辑与技术原理

核心架构
关键技术
  1. 连接池管理

    • 使用urllib3的连接池

    • 复用HTTP连接,减少TCP握手开销

    • 自动处理连接超时和重试

  2. 请求处理流程

    # 1. 构建PreparedRequestrequest = Request(methodurlheaders=headersdata=data).prepare()# 2. 发送请求response = self.send(request**send_kwargs)# 3. 处理响应return Response(status_code=resp.status,headers=resp.headers,content=resp.data,request=request)
  3. 自动内容解码

    • 根据响应头自动解码内容

    • 支持gzip、deflate压缩

    • 自动处理字符编码

  4. Cookie处理

    • 自动处理Set-Cookie头

    • 会话间Cookie持久化

    • 支持自定义Cookie策略

  5. SSL/TLS支持

    • 自动验证SSL证书

    • 支持客户端证书

    • 可配置验证级别


6. 安装与配置

基础安装
pip install requests
可选依赖
# 安装安全相关的额外依赖pip install requests[security]# 安装Socks代理支持pip install requests[socks]
环境要求
组件最低要求推荐配置
Python2.7+ 或 3.5+3.6+
操作系统任意任意
网络需要网络连接稳定的网络连接
验证安装
import requestsprint(requests.__version__)# 简单测试response = requests.get('https://httpbin.org/get')print(f"测试请求状态码: {response.status_code}")

7. 性能指标

操作类型执行时间内存开销适用场景
简单GET请求100-500ms1-10MB常规API调用
会话请求50-200ms5-20MB多次请求同一主机
大文件下载依赖网络可流式处理文件下载
并发请求依赖并发库每个线程独立高并发场景

8. 高级功能使用

1. 自定义认证
import requestsfrom requests.auth import AuthBaseclass BearerTokenAuth(AuthBase):"""自定义Bearer Token认证"""def __init__(selftoken):self.token = tokendef __call__(selfrequest):request.headers['Authorization'] = f'Bearer {self.token}'return requestdef custom_auth_demo():"""自定义认证演示"""# 使用自定义认证auth = BearerTokenAuth('your-token-here')response = requests.get('https://httpbin.org/bearer'auth=auth)print(f"认证响应: {response.json()}")# 使用HTTP基本认证from requests.auth import HTTPBasicAuthbasic_auth = HTTPBasicAuth('username''password')response = requests.get('https://httpbin.org/basic-auth/user/pass'auth=basic_auth)print(f"基本认证响应: {response.json()}")# 运行示例custom_auth_demo()
2. 代理设置
import requestsdef proxy_demo():"""代理演示"""proxies = {'http''http://10.10.1.10:3128','https''http://10.10.1.10:1080',    }# 使用代理response = requests.get('https://httpbin.org/ip'proxies=proxies)print(f"通过代理的IP: {response.json()}")# SOCKS代理(需要安装requests[socks])# proxies = {#     'http': 'socks5://user:pass@host:port',#     'https': 'socks5://user:pass@host:port'# }# 运行示例(需要实际代理服务器)# proxy_demo()
3. 事件钩子
import requestsdef hook_demo():"""事件钩子演示"""def print_url(r*args**kwargs):print(f"请求URL: {r.url}")def check_status(r*args**kwargs):r.raise_for_status()print("状态码正常")hooks = {'response': [print_urlcheck_status]    }response = requests.get('https://httpbin.org/json',hooks=hooks    )print("请求完成")# 运行示例hook_demo()
4. 流式请求
import requestsimport jsondef streaming_demo():"""流式请求演示"""# 流式上传def generate_large_data():for in range(10):yield json.dumps({'chunk'i'data''x'*100}).encode()response = requests.post('https://httpbin.org/post',data=generate_large_data(),headers={'Content-Type''application/json'}    )print(f"流式上传响应: {response.json()}")# Server-Sent Events (SSE)response = requests.get('https://httpbin.org/stream/5'stream=True)for line in response.iter_lines():if line:data = json.loads(line.decode())print(f"SSE数据: {data}")# 运行示例streaming_demo()

9. 与同类工具对比

特性requestsurllib3httpxaiohttp
API易用性⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐
同步支持⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐
异步支持⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐
HTTP/2⭐⭐⭐⭐⭐⭐⭐
性能⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐
生态成熟度⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐⭐

10. 安全与最佳实践

安全建议
  1. HTTPS验证

    # 始终验证SSL证书requests.get('https://example.com'verify=True)# 自定义CA证书包requests.get('https://example.com'verify='/path/to/certfile')
  2. 敏感信息保护

    # 不要将凭据硬编码在代码中import osAPI_KEY = os.getenv('API_KEY')response = requests.get('https://api.example.com/data',headers={'Authorization'f'Bearer {API_KEY}'})
  3. 输入验证

    def safe_request(url):# 验证URL格式if not url.startswith(('http://''https://')):raise ValueError("不安全的URL协议")return requests.get(url)
最佳实践
import requestsfrom requests.adapters import HTTPAdapterfrom requests.packages.urllib3.util.retry import Retrydef create_robust_session():"""创建健壮的会话"""session = requests.Session()# 重试策略retry_strategy = Retry(total=3,backoff_factor=1,status_forcelist=[429500502503504],    )# 适配器配置adapter = HTTPAdapter(max_retries=retry_strategy,pool_connections=10,pool_maxsize=10    )session.mount("http://"adapter)session.mount("https://"adapter)# 默认配置session.headers.update({'User-Agent''MyApp/1.0','Accept''application/json'    })return session# 使用示例with create_robust_session() as session:response = session.get('https://api.example.com/data')print(response.json())

11. 企业级应用案例

  1. Web服务客户端

    • 调用RESTful API

    • 微服务间通信

  2. 数据采集

    • 网络爬虫和数据挖掘

    • 实时数据获取

  3. 自动化测试

    • API接口测试

    • 集成测试

  4. 云服务集成

    • AWS、Azure、GCP SDK底层

    • 第三方API集成

  5. 移动应用后端

    • 与移动端通信

    • 推送通知服务


总结

requests 是 Python HTTP 客户端库的事实标准,核心价值在于:

  1. 简单易用:直观的API设计,几行代码完成复杂HTTP操作

  2. 功能全面:支持认证、Cookie、代理、SSL等高级功能

  3. 稳定可靠:经过多年生产环境验证,被数百万项目使用

  4. 生态丰富:庞大的用户群体和丰富的文档资源

技术亮点

  • 基于urllib3的连接池管理

  • 自动内容解码和编码

  • 灵活的会话和Cookie处理

  • 完善的错误处理和重试机制

适用场景

  • Web API调用和数据采集

  • 自动化测试和监控

  • 微服务和服务间通信

  • 快速原型开发和脚本编写

安装使用

pip install requests==2.31.0

学习资源

  • 官方文档:https://docs.python-requests.org/

  • 快速上手:https://requests.readthedocs.io/en/latest/user/quickstart/

  • 高级用法:https://requests.readthedocs.io/en/latest/user/advanced/

截至2023年,requests在GitHub收获 48k+ Star,月下载量超 1亿次,成为Python生态系统中最受欢迎的库之一。项目遵循 Apache 2.0 开源协议,可免费用于商业和非商业项目。

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  1. CONNECT:[ UseTime:0.000754s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000652s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000276s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000241s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000547s ]
  6. SELECT * FROM `set` [ RunTime:0.000191s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000596s ]
  8. SELECT * FROM `article` WHERE `id` = 476226 LIMIT 1 [ RunTime:0.012556s ]
  9. UPDATE `article` SET `lasttime` = 1772259935 WHERE `id` = 476226 [ RunTime:0.007933s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.002069s ]
  11. SELECT * FROM `article` WHERE `id` < 476226 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000733s ]
  12. SELECT * FROM `article` WHERE `id` > 476226 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000524s ]
  13. SELECT * FROM `article` WHERE `id` < 476226 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.022384s ]
  14. SELECT * FROM `article` WHERE `id` < 476226 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.011619s ]
  15. SELECT * FROM `article` WHERE `id` < 476226 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.016909s ]
0.147698s