[Doc] Add versionchanged mark in walrus operator citation on tutorial/datastructures

adorilson · adorilson · commit 9bbea64d1086 · 2019-10-28T17:22:16.000-03:00
diff --git a/Doc/tutorial/datastructures.rst b/Doc/tutorial/datastructures.rst
@@ -675,10 +675,11 @@ to a variable.  For example, ::
    >>> non_null
    'Trondheim'
 
-Note that in Python, unlike C, assignment inside expressions must be done
-explicitly with the walrus operator ``:=``. This avoids a common class of
-problems encountered in C programs: typing ``=`` in an expression when ``==``
-was intended.
+.. versionchanged:: 3.8
+   Note that in Python, unlike C, assignment inside expressions must be done
+   explicitly with the walrus operator ``:=``. This avoids a common class of
+   problems encountered in C programs: typing ``=`` in an expression when ``==``
+   was intended.
 
 
 .. _tut-comparing:
