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bpo-42198: Link to GenericAlias in typing and expressions (GH-23030)

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Follow up to 7cdf30fff3 and 4173320920. This addresses the point "1. Update links in typing, subscription and union to point to GenericAlias." in the bpo for this PR.
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kj 2020-10-30 12:01:17 +08:00 • committed by GitHub
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Doc/reference/expressions.rst
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@ -837,14 +837,8 @@ this method will need to explicitly add that support.
A string's items are characters. A character is not a separate data type but a
string of exactly one character.
..
At the time of writing this, there is no documentation for generic alias
or PEP 585. Thus the link currently points to PEP 585 itself.
Please change the link for generic alias to reference the correct
documentation once documentation for PEP 585 becomes available.
Subscription of certain :term:`classes <class>` or :term:`types <type>`
creates a `generic alias <https://www.python.org/dev/peps/pep-0585/>`_.
creates a :ref:`generic alias <types-genericalias>`.
In this case, user-defined classes can support subscription by providing a
:meth:`__class_getitem__` classmethod.