使用pip install安装命令时，会报错：You are using pip version 7.1.2, however version 8.1.1 is available。使用pip install安装命令时，会报错：You are using pip versio
阅读背景：
Python中pip版本升级error：You are using pip version 7.1.2, however version 8.1.1 is available.
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