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出现这个问题Some externally hosted files were ignored (use --allow-external PIL to allow)的主要原因是PIL的一些依赖库还没有安装
需要先安装PIL的依赖库
安装步骤
(1)首先通过homebrew安装libtiff,libjpeg webp little-cms2的库
brew install libtiff libjpeg webp little-cms2
(2)然后通过pip安装PIL
pip install Pillow
Mac osx 安装PIL出现Some externally hosted files were ignored (use --allow-external PIL to allow).
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原文地址:http://www.cnblogs.com/xiongqiangcs/p/4196407.html