python多线程怎么写_零基础学python爬虫

python多线程怎么写_零基础学python爬虫在 Python 中 实现多线程爬虫可以通过以下几种方式 1 使用 threading 模块 pythonimport threadingimp requests def fetch page url 抓取页面并处理数据 response requests get url print response text def main urls http

在Python中,实现多线程爬虫可以通过以下几种方式:

1. 使用`threading`模块:

 import threading import requests def fetch_page(url): 抓取页面并处理数据 response = requests.get(url) print(response.text) def main(): urls = ['http://example.com', 'http://example.org'] threads = [] for url in urls: thread = threading.Thread(target=fetch_page, args=(url,)) threads.append(thread) thread.start() for thread in threads: thread.join() if __name__ == '__main__': main() 

2. 使用`concurrent.futures`模块中的`ThreadPoolExecutor`:

 import concurrent.futures import requests def fetch_page(url): 抓取页面并处理数据 response = requests.get(url) print(response.text) def main(): urls = ['http://example.com', 'http://example.org'] with concurrent.futures.ThreadPoolExecutor(max_workers=5) as executor: executor.map(fetch_page, urls) if __name__ == '__main__': main() 

3. 使用`asyncio`和`aiohttp`库实现异步爬虫,虽然这不是传统意义上的多线程,但是可以实现并发:

 import asyncio import aiohttp async def fetch_page(session, url): async with session.get(url) as response: return await response.text() async def main(): urls = ['http://example.com', 'http://example.org'] async with aiohttp.ClientSession() as session: tasks = [fetch_page(session, url) for url in urls] responses = await asyncio.gather(*tasks) for response in responses: print(response) if __name__ == '__main__': asyncio.run(main()) 

以上示例展示了如何使用Python实现多线程爬虫。请根据实际需求选择合适的方法。

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