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比requests还好用的Python高效爬虫库,效率提升一倍!

  • 2026-02-28 01:14:46
比requests还好用的Python高效爬虫库,效率提升一倍!
嗨,我是虎哥,今天来聊聊一个比requests还好用的Python高效爬虫库,httpx。
最近公司在搞Python后端项目重构,整个后端逻辑都变成了“异步”协程的方式实现。看着满屏的async和await,虎哥内心那叫一个崩溃。之前对协程有点了解,但这次是真正上手了,今天就把学习成果分享给大家。

什么是协程?

协程是一种比线程更轻量级的存在。简单来说,协程是用户空间内的“轻量级线程”,由程序员自己管理。和多线程相比,协程有几个显著的优势:
  1. 控制权在用户手中:线程的控制权在操作系统手中,而协程完全由用户控制,这减少了上下文切换的开销,提高了效率。
  2. 更轻量:线程需要分配较大的栈空间(通常是MB级别),而协程只需要几KB,因此可以在相同内存中运行更多的协程。
  3. 避免锁机制:因为协程是单线程的,不存在多线程的资源竞争问题,不需要加锁,避免了死锁和竞争状态,提高了执行效率。
协程特别适合用于I/O密集型任务,例如网络请求、文件读写等,但不适用于CPU密集型任务。因为协程的本质是单线程,在处理大量计算任务时,还是需要多进程或多线程来分担。

为什么选择httpx?

搞清楚了协程,咱们来看看今天的主角——httpx。httpx是一个支持异步HTTP请求的库,几乎继承了requests的所有特性,可以认为是requests的“升级版”。对于那些已经习惯了requests的开发者来说,httpx的上手几乎没有学习成本。
安装httpx非常简单,只需要在命令行中执行:
pip install httpx

使用httpx进行异步请求

先来看看如何用httpx实现异步HTTP请求吧。

同步请求示例

先回顾一下同步请求的写法,这里用requests库来做个对比:
import requestsimport timedefsync_main(url, sign):    response = requests.get(url)    print(f'sync_main: {sign}: {response.status_code}')sync_start = time.time()[sync_main('http://www.baidu.com', i) for i in range(200)]sync_end = time.time()print(f'Total time for sync requests: {sync_end - sync_start} seconds')
这段代码发送了200次同步HTTP请求,并记录了总耗时。运行结果可能如下:
sync_main: 0: 200...sync_main: 199: 200Totaltime for sync requests: 16.6 seconds
可以看到,同步请求的总耗时约为16.6秒。

异步请求示例

现在,用httpx来实现相同的功能,但这次使用异步请求:
import asyncioimport httpximport timeasyncdefasync_main(url, sign):asyncwith httpx.AsyncClient() as client:        response = await client.get(url)        print(f'async_main: {sign}: {response.status_code}')asyncdefmain():    tasks = [async_main('http://www.baidu.com', i) for i in range(200)]await asyncio.gather(*tasks)async_start = time.time()asyncio.run(main())async_end = time.time()print(f'Total time for async requests: {async_end - async_start} seconds')
这段代码用httpx实现了异步HTTP请求。运行结果可能如下:
async_main: 0: 200...async_main: 199: 200Totaltime for async requests: 4.5 seconds
可以看到,异步请求的总耗时约为4.5秒,比同步请求缩短了近73%!

深入理解httpx

httpx不仅仅是requests的替代品,它还提供了一些额外的功能,使其在实际应用中更加强大和灵活。

1. 并发请求

使用httpx,我们可以轻松地实现并发请求,提高数据抓取效率。例如:
import asyncioimport httpxasyncdeffetch(url):asyncwith httpx.AsyncClient() as client:        response = await client.get(url)return response.textasyncdefmain(urls):    tasks = [fetch(url) for url in urls]    results = await asyncio.gather(*tasks)return resultsurls = ['http://example.com'for _ in range(100)]results = asyncio.run(main(urls))print(f'Fetched {len(results)} pages')
这段代码演示了如何使用httpx并发地抓取多个网页,并将结果存储在一个列表中。通过这种方式,可以显著提高爬虫的效率。

2. 异步上下文管理

httpx提供了异步上下文管理器,确保在异步操作中正确地管理资源。例如:
import httpximport asyncioasyncdeffetch(url):asyncwith httpx.AsyncClient() as client:        response = await client.get(url)return responseasyncdefmain():    response = await fetch('http://example.com')    print(response.text)asyncio.run(main())
在这个示例中,async with语句确保在异步操作完成后正确关闭HTTP客户端。

3. 超时和重试机制

在网络请求中,超时和重试机制是非常重要的。httpx提供了灵活的超时和重试配置:
import httpximport asyncioasyncdeffetch(url):asyncwith httpx.AsyncClient(timeout=5.0as client:        response = await client.get(url)return responseasyncdefmain():try:        response = await fetch('http://example.com')        print(response.text)except httpx.TimeoutException:        print('Request timed out')asyncio.run(main())
这里设置了一个5秒的超时时间,如果请求超过这个时间未完成,将抛出一个TimeoutException。

httpx在实际项目中的应用

虎哥最近在实际项目中使用httpx进行数据抓取,不得不说,效率真的提升了不少。尤其是在处理需要大量并发请求的场景时,httpx简直就是利器。

1. 数据抓取

在一个数据抓取项目中,需要抓取上千个页面的数据。使用httpx后,不仅代码简洁了很多,效率也提高了一倍以上。例如:
import asyncioimport httpxasyncdeffetch_data(url):asyncwith httpx.AsyncClient() as client:        response = await client.get(url)return response.json()asyncdefmain(urls):    tasks = [fetch_data(url) for url in urls]    results = await asyncio.gather(*tasks)for result in results:        print(result)urls = [f'http://api.example.com/data/{i}'for i in range(100)]asyncio.run(main(urls))

2. 接口测试

在接口测试中,httpx的异步特性也大有用武之地。例如,需要并发地测试多个API接口,可以使用以下代码:
import asyncioimport httpxasyncdeftest_api(url):asyncwith httpx.AsyncClient() as client:        response = await client.get(url)assert response.status_code == 200asyncdefmain(urls):    tasks = [test_api(url) for url in urls]await asyncio.gather(*tasks)urls = [f'http://api.example.com/test/{i}'for i in range(100)]asyncio.run(main(urls))

结语

总的来说,httpx是一个非常强大且高效的HTTP请求库,尤其适合在需要大量并发请求的场景下使用。
如果你还在使用requests,不妨尝试一下httpx,感受一下异步请求带来的效率提升。

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  1. CONNECT:[ UseTime:0.000741s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000974s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000320s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000276s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000467s ]
  6. SELECT * FROM `set` [ RunTime:0.000213s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000518s ]
  8. SELECT * FROM `article` WHERE `id` = 477496 LIMIT 1 [ RunTime:0.000492s ]
  9. UPDATE `article` SET `lasttime` = 1772240258 WHERE `id` = 477496 [ RunTime:0.009577s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.003730s ]
  11. SELECT * FROM `article` WHERE `id` < 477496 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000528s ]
  12. SELECT * FROM `article` WHERE `id` > 477496 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000378s ]
  13. SELECT * FROM `article` WHERE `id` < 477496 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001424s ]
  14. SELECT * FROM `article` WHERE `id` < 477496 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001612s ]
  15. SELECT * FROM `article` WHERE `id` < 477496 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001776s ]
0.087788s