You don't sound like a Python developer, that's probably the reason. When I search for "AppDirs", I only find references to what is e.g. XDG_BASE_DIRS on Linux (and others on other platforms)? Which I asuume is not what you mean. Most likely this is something particular to your environment, whatever that is.

In the Python ecosystem, uv is great for "project management" - lock files, project dependency environments ("venv"s) etc (similar to npm for js). In the Python ecosystem it's considered best practice to bundle binary dependencies with Python libraries, and then there'll be a binary distribution for each platform (os, libc).