在Windows下安裝virtualenv 時，碰到了如下問題
這是由於網絡不穩定，因此在安裝模塊時，指定國內鏡像
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 是為了獲得ssl證書的認證
ERROR: Could not find a version that satisfies the requirement virtualenv (from versions: none）
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