今天用pip安裝skimage時報錯：
這是因為網絡的問題，需要使用國內的鏡像源來加速,比如豆瓣源
命令改為：
pip install scikit-image -i http://pypi.douban.com/simple/ --trusted-host pypi.douban.com
或者
pip3 install scikit-image -i http://pypi.douban.com/simple/ --trusted-host pypi.douban.com
最后成功安裝：
免責聲明！
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