Circular dependency between `mapping` term `collections.abc.Mapping`

Documentation

The mapping (1) glossary term is defined as

A container object that supports arbitrary key lookups and implements the methods specified in the collections.abc.Mapping or collections.abc.MutableMapping abstract base classes. Examples include dict, collections.defaultdict, and collections.Counter.

Whereas for example collections.abc.Mapping(2) and collections.abc.MutableMapping(2) have the documentation:

ABCs for read-only and mutable mappings.

I expected either the documentation on a mapping or the documentation on the ABC's to describe or link to what methods a (mutable) mapping implements. Now they refer to each other in a circle for the actual specification of what methods are required.

1: https://docs.python.org/3/glossary.html#term-mapping
2: https://docs.python.org/3/library/collections.abc.html#collections.abc.Mapping

Linked PRs

• gh-149348

Review linked PR gh-149348 first, then inspect the glossary mapping entry and the collections.abc.Mapping and collections.abc.MutableMapping documentation linked in the report. Update the documentation so the required mapping methods are described without the two entries referring circularly to each other.