当通过pip命令安装三方库出现以下报错，就是pip库需要升级：
You are using pip version 9.0.3, however version 18.1 is available.
You should consider upgrading via the 'python -m pip install --upgrade pip' command.
解决办法 ：
python -m pip install --upgrade pip
当通过pip命令安装三方库出现以下报错，就是pip库需要升级：
You are using pip version 9.0.3, however version 18.1 is available.
You should consider upgrading via the 'python -m pip install --upgrade pip' command.
解决办法 ：
python -m pip install --upgrade pip
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