若有报错信息：setuptools Compression requires the (missing) zlib module，需执行步骤1-2（否则可忽略）
1. 安装zlib 和 zlib-devel
yum install zlib
yum install zlib-devel
2. 重新编译安装python2.7.9
tar zxvf Python-2.7.9.tgz
cd Python-2.7.9
make
make install
3. 进入setuptools目录
tar zxvf setuptools-20.2.2.tar.gz
cd setuptools-20.2.2
python setup.py install
4. 进入pip目录
tar zxvf pip-8.0.2.tar.gz
cd pip-8.0.2
python setup.py build
python setup.py install
5. 创建软链接
mv /usr/bin/pip /usr/bin/pip7.1.0
ln -s /usr/local/bin/pip /usr/bin/pip