My intuition: a python interpreter gets one `PYTHONPATH` variable and so when I `import my_dep` in my app and another dependency also imports `my_dep`, they are

My intuition: a python interpreter gets one `PYTHONPATH` variable and so when I `import my_dep` in my app and another dependency also imports `my_dep`, they are resolved by the interpreter and cannot specify different source locations for `my_dep`, which I believe would be called "vendoring". Again I am not sure if that is why Python can't support a tree or simply why it doesn't currently support a tree, I searched for a PEP explicitly defining dependency resolution but couldn't find one.