在我们安装第三方库的时候会在结尾出现如下两行内容
You are using pip version 9.0.1, however version 18.0 You are using pi
阅读背景：
Python pip安装时You are using pip version 9.0.1, however version 18.0 is available. You should consider upgrading via the 'python -m pip install --upgrade pip' command.
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