====== Python: 가상환경 ======

  * conda
    * https://conda.io/projects/conda/en/latest/user-guide/tasks/manage-environments.html#using-pip-in-an-environment
  * pipenv
    * https://pipenv.readthedocs.io/en/latest/
    * https://towardsdatascience.com/comparing-python-virtual-environment-tools-9a6543643a44