python 가상환경 virtualvenv

참고

https://www.youtube.com/watch?v=L_EF4r5dWno&list=PLNgPShXbeBwFcgtNDX4hWWMNj7E1atOXE

python -m pip install --upgrade pip wheel setuptools virtualenv
python.exe -m pip install --upgrade pip
python -m virtualenv employee_venv
employee_venv\Scripts\activate