centos7 安装pip2和pip3

linux pip2 安装
cd /usr/bin
 yum install -y epel-release
 yum install -y python-pip

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 linux 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
至此 pip3安装完成,