If using pyenv to support multiple python versions, when creating venvs, make sure to pass --copies to it.

% python3 -m venv venv --copies

Ordinarily, venv uses symbolic links back to the current version of the python binary. A lot of tools and IDEs don’t traverse symbolic links. That flag actually copies the real binaries over to the venv.

This avoids a metric ton of hard-to-diagnose misery later on.