[issue17306] Improve the way abstract base classes are shown in help()

[Raymond Hettinger]

Raymond Hettinger <raymond.hettinger at gmail.com> added the comment:

There is just a little more work to do on this.

1) The class level docstrings needs to display which methods are required.  Sequence.__doc__ already does a good job of this but most of the other classes are missing docstrings or don't specific the needed methods.

2) Methods like Sequence.count and Mapping.__eq__ already have a good docstrings but there is nothing for most of the other methods.  The docstring should be modeled on that for the corresponding methods in the concrete classes (list.__getitem__ for example).

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keywords: +newcomer friendly
versions: +Python 3.8, Python 3.9 -Python 3.5

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<https://bugs.python.org/issue17306>
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