参考：
docker 内升级Python 3.5 到3.6
删除python3.6的pip
apt-get remove -y python3-pip apt-get autoremove -y
安装python3.8版本
apt-get install -y python3.8
安装python3.8版本的pip
apt-get install -y python3-pip rm /usr/bin/python3 ln -s /usr/bin/python3.8 /usr/bin/python3 python3.8 -m pip install --upgrade pip pip3 install psutil pytest pytest-html pytest-timeout pytest-httpserver pylint pytest-asyncio autopep8 boto3 pytest-repeat pyyaml
查看版本
python3 -V pip -V #pip3 -V
