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
1 pip install 包名 -i http://pypi.douban.com/simple/ --trusted-host pypi.douban.com
其后指定的 --trusted-host pypi.douban.com 是为了获得ssl证书的认证
ERROR: Could not find a version that satisfies the requirement virtualenv (from versions: none）
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