Python学习爬虫-阿里云

求助刚学python 学习爬虫?报错 url = "http://www.douban.com/" request = urllib.request.Request(url) response = urllib.request.urlopen(request) data = response.read() print(data) 先上代...

Python学习，多进程了解一下！学爬虫不会用多进程能行吗？ python中的多线程其实并不是真正的多线程，如果想要充分地使用多核CPU的资源，在python中大部分情况需要使用多进程。Python提供了非常好用的多进程包multiprocessing，只需要定义一个函数，Python会完成其他所有事情。借助这个包，可以轻松完成从单进程到并发执行的转换本来...

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Python学习(20)--爬虫 Python学习(20)--爬虫在前几节我们一直在介绍正则表达式,今天我们就使用正则表达式写一个爬虫的小程序。首先什么是爬虫呢?爬虫就是按照一定的规则,自动地获取网络上的信息。下面我们将介绍一个通过爬虫获取网络图片的例子。其中,我们利用正则表达式匹配图片的网络地址,正则表达式其实就是我们爬虫用到的...

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