#wget https://www.python.org/ftp/python/3.5.1/Python-3.5.1.tar.xz

1 xz -d Python-3.5.1.tar.xz
2 tar -xf Python-3.5.1.tar.xz

$mkdir /usr/local/python3.5

$cd /usr/local/src/Python-3.5.1
#./configure --prefix=/usr/local/python3.5
#make all
#make install
#make clean
#make distclean

$ /usr/local/python3.5/bin/python3.5 -V Python 3.5.1

$echo $PATH
 /usr/lib/qt-3.3/bin:/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin:/home/gordon/bin

1 备份pythonmv /usr/bin/python /usr/bin/python2.6.6
2 修改软连接 sudo ln -s /usr/local/python3.5/bin/python3 /usr/bin/python

$ python -V
　Python 3.5.1