使用root账号
wget https://www.python.org/ftp/python/3.4.4/Python-3.4.4.tgz
tar -zxf Python-3.4.4.tgz
cd Python-3.4.4
./configure
make
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make install
输入python3即可
将python3切换到默认
sudo rm -rf /usr/bin/python
sudo ln -s /usr/local/bin/python3.4 /usr/bin/python
将python2切换到默认
sudo rm -rf /usr/bin/python
sudo ln -s /usr/bin/python2.7 /usr/bin/python