Have inspect.getdoc follow the MRO when a method docstring is only one line.

Feature or enhancement

"Hot" on the heels of 3.5ish's https://github.com/python/cpython/issues/59787 comes another idea: An age old pattern we have in our codebase is for people to put """See base class.""" as the docstring on methods to appease lint tooling demanding a docstring on non-trivial methods. As a consequence code written this way doesn't trigger the inspect.getdoc() feature from #59787 and the help() text in a Notebook for such functions is the content-free oneliner instead of heading up the MRO chain.

I propose a new feature: If the docstring for a method exists but is <= 1 line, follow the MRO as if there were no docstring and return

f"{onelinedoc}:\n{mro_doc}" as the docstring. Do this recursively, but collapse duplicate docstrings gathered along the way so that you could wind up with [good]:

"""See base class:
Fill a hovercraft with eels of the chosen species.

Args:
  species: A set of allowed Eel types.
  count: float, a non-negative number of eels to add. Fractions are allowed.
"""

rather than this degenerate pattern in deep heirarchies that could otherwise result [bad]:

"""See base class:
See base class:
See base class:
Fill a hovercraft with ...
"""

Collapsing identical docstrings along the heirarchy in this case also works for the situation where they're all the same cut and pasted oneliner and nothing else.

エントリーポイント inspect.getdoc と issue で提案されている例から始めます。再帰的な MRO ルックアップで一行の docstring と重複したテキストをどのように扱うべきかを判断し、その結果得られるドキュメントが、行を繰り返さずに目的の展開された形式を維持していることを確認します。