PEP 257 – Docstring Conventions | peps.python.org
www.python.org › dev › pepsMay 29, 2001 · A docstring is a string literal that occurs as the first statement in a module, function, class, or method definition. Such a docstring becomes the __doc__ special attribute of that object. All modules should normally have docstrings, and all functions and classes exported by a module should also have docstrings.