You are using pip version 9.0.1, however version 19.0.2 is available. You should consider upgrading

在windows下使用pip安装时出现提示:You are using pip version 9.0.1, however version 19.0.2 is available. You should consider upgrading via the ‘python -m pip install --upgrade pip’ command. 说明pip版本太低,这时需要使用python

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