pip2 安装
yum install -y epel-release
yum install -y python-pip
pip3 安装
wget https://files.pythonhosted.org/packages/69/81/52b68d0a4de760a2f1979b0931ba7889202f302072cc7a0d614211bc7579/pip-18.0.tar.gz
tar -xvf pip-18.0.tar.gz
cd pip-18.0.tar.gz
python setup.py install