# 下载最新版本
cd /usr/local/src/
sudo wget http://www.python.org/ftp/python/3.3.2/Python-3.3.2.tar.bz2
sudo chmod 777 Python-3.3.2.tar.bz2 
sudo tar -jx -f Python-3.3.2.tar.bz2


# 安装


cd Python-3.3.2/
./configure --prefix=/usr/local/Python-3.3.2/
sudo make
sudo make install


# 浏览旧版本
cd /usr/bin/
ls -l python*


# 配置新版本：
echo $PATH
PATH=$PATH:/usr/local/Python-3.3.2/bin
echo $PATH


# 链接新版本
cd /usr/bin/
sudo rm -rf python
sudo ln -s /usr/local/Python-3.3.2/bin/python3 ./python


# 输入python检查是否更新,进入后可输入exit()退出python.
python


# 还原旧版本：
ll python*
sudo rm -rf python

sudo ln -s /usr/bin/python2.6 ./python

cat .bash_profile

PATH=$PATH:/usr/local/Python-3.4/bin
ln -s /usr/local/Python-3.4/bin/python3 ./python

source　.bash_profile