[Fradow]

My solution is to:

* use a virtualenv, so that dependencies are installed per project and not globally

* only specify my top-level dependencies in a requirements.in file, and let pip-compile (a dependency, part of pip-tools) compile my requirements.txt

So far it has served me well and I've not encountered any error due to this method.

I cannot claim it is "the right way" though, just something that works for me.