# on Windows
pip install virtualenvwrapper-win
# on macOS / Linux
pip install --user virtualenvwrapper
# then make Bash load virtualenvwrapper automatically
echo "source virtualenvwrapper.sh" >> ~/.bashrc
source ~/.bashrc
2. 创建虚拟环境
# on macOS/Linux:
mkvirtualenv --python=python3.6 venv
# on Windows
mkvirtualenv --python=python3 venv