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Diffstat (limited to 'Doc/whatsnew/3.10.rst')
| -rw-r--r-- | Doc/whatsnew/3.10.rst | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/Doc/whatsnew/3.10.rst b/Doc/whatsnew/3.10.rst index 1ea5aea..2bcdba6 100644 --- a/Doc/whatsnew/3.10.rst +++ b/Doc/whatsnew/3.10.rst @@ -70,6 +70,23 @@ Summary -- Release highlights New Features ============ +.. _whatsnew310-pep563: + +PEP 563: Postponed Evaluation of Annotations Becomes Default +------------------------------------------------------------ + +In Python 3.7, postponed evaluation of annotations was added, +to be enabled with a ``from __future__ import annotations`` +directive. In 3.10 this became the default behavior, even +without that future directive. With this being default, all +annotations stored in :attr:`__annotations__` will be strings. +If needed, annotations can be resolved at runtime using +:func:`typing.get_type_hints`. See :pep:`563` for a full +description. Also, the :func:`inspect.signature` will try to +resolve types from now on, and when it fails it will fall back to +showing the string annotations. (Contributed by Batuhan Taskaya +in :issue:`38605`.) + * The :class:`int` type has a new method :meth:`int.bit_count`, returning the number of ones in the binary expansion of a given integer, also known as the population count. (Contributed by Niklas Fiekas in :issue:`29882`.) |