ERROR: Could not find a version that satisfies the requirement virtualenv (from versions: none）
在Windows下安装virtualenv 时，碰到了如下问题 这是由于网络不稳定，因此在安装模块时，指定国内镜像 其后指定的 --trusted-host pypi.do ...
原文：【linux】 scrapy : Could not find a version that satisfies the requirement Twisted>=13.1.0 (from Scrapy) (from versions: )
centos python 安装 scrapy 时候报错，错误信息如下： 解决办法： 官网下载：http: twistedmatrix.com trac wiki Downloads 把下载的源码包上传到服务器 ...
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