解决问题:
You are using pip version 9.0.1, however version 10.0.1 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.

解决方法
直接运行命令:python -m pip install --upgrade pip 就可以了
如果你电脑上安装了两个版本的python,比如Mac上本来自带python2版本,但是你想安装在python3目录内,请把解决方法的运行命令的python改成python3