虚拟环境

There are some great third-party tools for creating virtual environments, such asconda and virtualenv,venv

python3 -m venv venv
source venv/bin/activate #激活
deactivate               #失活

参考

https://docs.python.org/3/library/venv.html
https://realpython.com/python-virtual-environments-a-primer/#how-can-you-work-with-a-python-virtual-environment