virtualenv & venv

virtualenv needs to be installed, e.g. via conda.

venv is a subset of virtualenv that is integrated into the Python standard library and therefore needs no further installation.

venv

• https://docs.python.org/3/tutorial/venv.html

• https://docs.python.org/3/library/venv.html

When the environment is created, the currently active Python version is ‘inherited’. So make sure that the appropriate Python version is active by having the appropriate corresponding conda environment activated.

• create a venv with the name .venv:

  $ python -m venv .venv
  

• activate the environment:

  $ source .venv/bin/activate
  

• pip install packages or write a requirements.txt file for running pip install -r requirements.txt.