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bpo-41370: Add note about ForwardRefs and PEP585 generic types in docs (#25183)

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Ken Jin 2021-04-04 23:14:44 +08:00 • committed by GitHub
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Doc/library/typing.rst
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@ -1948,10 +1948,15 @@ Introspection helpers
.. class:: ForwardRef
A class used for internal typing representation of string forward references.
For example, ``list["SomeClass"]`` is implicitly transformed into
``list[ForwardRef("SomeClass")]``. This class should not be instantiated by
For example, ``List["SomeClass"]`` is implicitly transformed into
``List[ForwardRef("SomeClass")]``. This class should not be instantiated by
a user, but may be used by introspection tools.
.. note::
:pep:`585` generic types such as ``list["SomeClass"]`` will not be
implicitly transformed into ``list[ForwardRef("SomeClass")]`` and thus
will not automatically resolve to ``list[SomeClass]``.
.. versionadded:: 3.7.4
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