Are docstrings for internal functions (python) necessary? [closed]

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In python we designate internal function/ private methonds with an underscore at the beginning. Should these functions be documented with docstrings(is it required?)? (the formal documentation i mean, not the one helping the code-reader to understand the code) What is common practice for this?

Answer 1

Lo, I quote from PEP 8, the wise words of which should be considered law. Upon this very topic, PEP 8 saith:

• 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.