You are using pip version 9.0.1, however version 19.2.3 is available. You should consider upgrading

You are using pip version 9.0.1, however version 19.2.3 is available.You should consider upgrading via the 'python -m pip install --upgrade pip' command.

1.输入python -m pip install --upgrade pip,仍然弹出该错误。

2.查阅网上帖子，有提到可能是Python问题，64位安装了32位的Python,输入python -v 命令，果然如此。

3.卸载后下载安装64位版本。 再次运行，成功！