Ubuntu 18.04.5 配置python3 pip 以及虚拟环境
sudo gedit ~/.bashrc
export WORKON_HOME=~/.virtualenvs
export VIRTUALENVWRAPPER_PYTHON=/usr/bin/python3
# export VIRTUALENVWRAPPER_VIRTUALENV=~/.local/bin/virtualenv
source /usr/local/bin/virtualenvwrapper.sh
sudo source ~/.bashrc