sudo add-apt-repository ppa:fkrull/deadsnakes
sudo apt-get update
sudo apt-get install python3.6
python --version
sudo apt-get install python3-pip #装pip3
调整python3的优先级，使得3.6优先级高于3.5
sudo update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.5 1
sudo update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.6 2
问题：ModuleNotFoundError: No module named 'gdbm‘
sudo apt-get install pyhton3.6-gdbm
pip问题：
首先查看版本 pip -V 指向3.5
sudo apt-get remove python3-pip
sudo apt-get install python3-pip
pyhton3.6 -m pip install --upgrade pip
遇到问题
错误1：
File "/usr/local/bin/pip“，line 6, in
from pip._internal.cli.main import main
错误2：
File “/usr/local/bin/pip”, line 6, in
from pip._internal import main
解决：
wget https://bootstrap.pypa.io/pip/3.6/get-pip.py
python3 get-pip.py