pip安装的问题
You are using pip version 8.1.2, however version 10.0.1 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.
yum出现的问题：
最后一个依赖包所有镜像都没有找到：
python-httplib2-0.9.2-1.el7.noarch
python -m pip install --upgrade pip
pip安装的解决了，yum还是没有解决。