centos6.5更新python2.7影响pip和easy_install

一般更新python的时候只知道会影响yum，但没注意会影响pip和easy_install，需要卸载安装

安装依赖环境
yum install zlib-devel zlib openssl openssl-devel readline-devel (zlib安装setuptools的时候会用到，没有的会报“RuntimeError: Compression requires the (missing) zlib module”；openssl是pip会用到，没有会报ImportError: cannot import name HTTPSHandle，如果不提前安装会来回重新编译安装python，很浪费时间)

安装pythonwget https://www.python.org/ftp/python/2.7.8/Python-2.7.8.tar.xz
tar -xvf Python-2.7.8.tar.xz
cd Python-2.7.8 && ./configure && make && make install
mv /usr/bin/python /usr/bin/python_old
ln -s /usr/local/bin/python2.7 /usr/bin/python

修改yumvim /usr/bin/yum（把第一行的语言环境改成python_old）

安装pipwget https://pypi.python.org/packages/source/p/pip/pip-7.1.2.tar.gz#md5=3823d2343d9f3aaab21cf9c917710196
tar xf pip-7.1.2.tar.gz && cd pip-7.1.2 && python setup.py install
pip install --upgrade pip
pip -V

安装easy_install
wget https://pypi.python.org/packages/source/s/setuptools/setuptools-18.2.tar.gz#md5=52b4e48939ef311d7204f8fe940764f4
tar fxz setuptools-18.2.tar.gz && cd setuptools-18.2 && python setup.py install