PEP-8 clearly states which parts of your code should have documentation:
Write docstrings for all public modules, functions, classes, and methods. Docstrings are not necessary for non-public methods, but you should have a comment that describes what the method does. This comment should appear after the def line.
And while the above excerpt says that providing docstrings for non-public(a.k.a implementation) classes/functions/modules are not necessary, I fell like doing so makes the code easier to maintain in the future.
However, most python code-bases I see seem to adhere(more or less)to what PEP-8 says above; omitting docstrings for implementation classes/functions/modules. With that in mind, I'm wondering if I should avoid doing this in the future as well. It seems that if other python devs are not doing it, there are probably good reasons why.
Would it be bad practice to continue to give docstrings to implementation code, or is this solely a matter of ones preference?