参考链接： Linux安装python2.7、pip和setuptools: https://www.cnblogs.com/xiaowenshu/p/10239834.html
安装python
官网下载python2: https://www.python.org/downloads/
编译安装：
# 安装依赖库
yum install gcc g++ zlib zlib-devel openssl-devel
# 解压
tar -zxvf Python-2.7.14.tgz
# 创建安装文件夹
mkdir /usr/local/python27
# 编译安装
cd Python-2.7.14
./configure --prefix=/usr/local/python27/
make
make install
替换默认的python
ln -s /usr/local/python27/bin/python2.7 /usr/bin/python
ln -s /usr/local/python27/bin/python2.7 /usr/bin/python2
ln -s /usr/local/python27/bin/python2.7 /usr/bin/python27
ln -s /usr/local/python27/bin/python2.7 /usr/bin/python2.7
查看是否替换成功
python --version
修改python版本之后yum不能用的解决方法：
修改第一行指定的解析器链接：
vi /usr/bin/yum
#!/usr/bin/python
安装setup-tools和pip
setuptools下载链接： https://pypi.python.org/pypi/setuptools，下载zip的文件
wget https://pypi.python.org/packages/45/29/8814bf414e7cd1031e1a3c8a4169218376e284ea2553cc0822a6ea1c2d78/setuptools-36.6.0.zip#md5=74663b15117d9a2cc5295d76011e6fd1
unzip setuptools-36.6.0.zip
cd setuptools-36.6.0
python setup.py install
下载pip的链接： https://pypi.python.org/pypi/pip
wget https://pypi.python.org/packages/11/b6/abcb525026a4be042b486df43905d6893fb04f05aac21c32c638e939e447/pip-9.0.1.tar.gz#md5=35f01da33009719497f01a4ba69d63c9
tar -zxvf pip-9.0.1.tar.gz
cd pip-9.0.1
python setup.py install
创建软链接来替换文件
rm -rf /usr/bin/easy_install* /usr/bin/pip
ln -s /usr/local/python27/bin/pip2.7 /usr/bin/pip
ln -s /usr/local/python27/bin/pip2.7 /usr/bin/pip27
ln -s /usr/local/python27/bin/pip2.7 /usr/bin/pip2.7
ln -s /usr/local/python27/bin/easy_install /usr/bin/easy_install
ln -s /usr/local/python27/bin/easy_install /usr/bin/easy_install27
ln -s /usr/local/python27/bin/easy_install /usr/bin/easy_install2.7
验证操作是否成功
pip --version
