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-rw-r--r--Doc/whatsnew/3.7.rst7
1 files changed, 7 insertions, 0 deletions
diff --git a/Doc/whatsnew/3.7.rst b/Doc/whatsnew/3.7.rst
index 0d19f25942..a2e6422793 100644
--- a/Doc/whatsnew/3.7.rst
+++ b/Doc/whatsnew/3.7.rst
@@ -93,6 +93,13 @@ New Modules
Improved Modules
================
+unittest.mock
+-------------
+
+The :const:`~unittest.mock.sentinel` attributes now preserve their identity
+when they are :mod:`copied <copy>` or :mod:`pickled <pickle>`.
+(Contributed by Serhiy Storchaka in :issue:`20804`.)
+
Optimizations
=============