centos6升级python版本为2.7，并替换yum

1、下载安装包

cd /usr/local/src 
wget https://www.python.org/ftp/python/2.7.13/Python-2.7.13.tgz
tar -zxvf Python-2.7.13.tgz

2、编译

cd Python-2.7.13
./configure --prefix=/usr/local/python27
make && make install

3、置换老版本

mv /usr/bin/python /usr/bin/python_old
ln -s /usr/local/python27/bin/python2.7 /usr/bin/python
/usr/bin/python

4.修改yum依靠的python源，避免yum不能用

vi /usr/bin/yum

将第一行 #!/usr/bin/python 改为#!/usr/bin/python2.6 或者 #!/usr/bin/python_old

pip安装

wget https://bootstrap.pypa.io/get-pip.py --no-check-certificate
python get-pip.py

pip安装方式2：

去https://pypi.python.org/pypi/pip/9.0.1#downloads 下载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
python pip-9.0.1/setup.py install