pip报错，按照提示更新没有成功
You are using pip version 9.0.1, however version 9.0.3 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.
解决办法：
1、下载pip
https://pypi.python.org/pypi/pip
2、解压安装
sudo python setup.py install
3、查看版本
pip --version
参考：
1. You are using pip version 9.0.1, however version 9.0.3 is available.
