You are using pip version 19.0.3, however version 19.3.1 is available. You should consider upgrading

You are using pip version 19.0.3, however version 19.3.1 is available. You should consider upgrading via the ‘python -m pip install --upgrade pip’ command. 一般出现这种情况是因为使用的pip版本与所安装的python版本不对应导致,建议查看自己
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