up:: [[Python Poetry MOC]] With Poetry, to change an underlying Python version (for testing, etc.) and create a new virtualenv on top of that, use `poetry env use /PATH/TO/VERSION/BINARY`. For pyenv, this will be `poetry env use ~/.pyenv/versions/x.y.z/bin/python3`. This will create and activate a new virtual environment, but it won't show up automatically in the shell. To make it show up, get the full path of the activated virtual environment with `poetry env list --full-path`, then use that with `source /VIRTUALENV/PATH/bin/activate`.