bpo-38558: Mention := in conditions tutorial (GH-16919)

miss-islington · ammaraskar · web-flow · commit cf028b571694 · 2019-10-25T15:27:07.000-07:00
(cherry picked from commit cb2cf06) Co-authored-by: Ammar Askar <ammar@ammaraskar.com>
diff --git a/Doc/tutorial/datastructures.rst b/Doc/tutorial/datastructures.rst
@@ -675,10 +675,10 @@ to a variable.  For example, ::
    >>> non_null
    'Trondheim'
 
-Note that in Python, unlike C, assignment cannot occur inside expressions. C
-programmers may grumble about this, but it avoids a common class of problems
-encountered in C programs: typing ``=`` in an expression when ``==`` was
-intended.
+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:
