bpo-36004: Add date.fromisocalendar (GH-11888)

This commit implements the first version of date.fromisocalendar, the
inverse function for date.isocalendar.

1 files changed, 10 insertions, 0 deletions

diff --git a/Doc/whatsnew/3.8.rst b/Doc/whatsnew/3.8.rst
index 225faf8..ac57335 100644
--- a/Doc/whatsnew/3.8.rst
+++ b/Doc/whatsnew/3.8.rst
@@ -244,6 +244,16 @@ where the DLL is stored (if a full or partial path is used to load the initial
 DLL) and paths added by :func:`~os.add_dll_directory`.
 
 
+datetime
+--------
+
+Added new alternate constructors :meth:`datetime.date.fromisocalendar` and
+:meth:`datetime.datetime.fromisocalendar`, which construct :class:`date` and
+:class:`datetime` objects respectively from ISO year, week number and weekday;
+these are the inverse of each class's ``isocalendar`` method.
+(Contributed by Paul Ganssle in :issue:`36004`.)
+
+
 gettext
 -------