下载python2

wget http://www.python.org/ftp/python/2.7.9/Python-2.7.9.tgz

 解压python2

sudo tar xzf Python-2.7.9.tgz

安装python2

sudo ./configure --enable-optimizations
sudo make altinstall

创建快捷方式（随便选择一种）

sudo ln -sfn '/usr/local/bin/python2.7' '/usr/bin/python2'

sudo update-alternatives --install /usr/bin/python python /usr/bin/python2 1

sudo update-alternatives --config python

下载python2-pip

curl http://bootstrap.pypa.io/pip/2.7/get-pip.py --output get-pip.py

sudo python2 get-pip.py