python 2.7.5升级到3.4.x

wget https://www.python.org/ftp/python/3.4.3/Python-3.4.3.tgz
tar -xf Python-3.4.3.tgz 
cd Python-3.4.3/
Python 3.4.3
./configure
make
make install
 
mv /usr/bin/python /usr/bin/python2.7.5
vim /usr/bin/yum
将第一行python 改为python2.7.5
vim /usr/libexec/urlgrabber-ext-down
也改为python 2.7.5

ln -s /usr/local/bin/python3.4 /usr/bin/python
python -V 查看版本