ERROR: Could not find a version that satisfies the requirement PIL (from versions: none)

安装PIL库时报错：

pip3 install PIL -i http://pypi.douban.com/simple --trusted-host pypi.douban.com
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Looking in indexes: http://pypi.douban.com/simple
ERROR: Could not find a version that satisfies the requirement PIL (from versions: none)
ERROR: No matching distribution found for PIL

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百度一下，发现PIL较多用于2.7版本的Python中，到python3版本已经用Pillow代替PIL了。
所以，我们应该去安装Pillow库，引入的命令方式也从：import image变为：from PIL import Image
运行命令：

pip3 install Pillow -i http://pypi.douban.com/simple --trusted-host pypi.douban.com
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Looking in indexes: http://pypi.douban.com/simple
Collecting Pillow
  Downloading http://pypi.doubanio.com/packages/e8/f2/6722dd0c22e3a143ac792ccb2424924ac72af4adea756b1165b4cad50da7/Pillow-7.2.0-cp37-cp37m-manylinux1_x86_64.whl (2.2 MB)
     |████████████████████████████████| 2.2 MB 776 kB/s
Installing collected packages: Pillow
Successfully installed Pillow-7.2.0

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成功安装pillow, 没有再报缺少PIL库。