gh-97913 Docs: Add walrus operator to the index (#97921)

hugovk · Mariatta · ezio-melotti · web-flow · commit 296313002fde · 2022-10-08T08:54:16.000+02:00
* Add walrus operator to the index

* Add named expression to the index

Co-authored-by: Mariatta Wijaya &lt;Mariatta@users.noreply.github.com&gt;

* Fix indentation and add missing newline

Co-authored-by: Ezio Melotti &lt;ezio.melotti@gmail.com&gt;

Co-authored-by: Mariatta Wijaya &lt;Mariatta@users.noreply.github.com&gt;
Co-authored-by: Ezio Melotti &lt;ezio.melotti@gmail.com&gt;
diff --git a/Doc/reference/expressions.rst b/Doc/reference/expressions.rst
@@ -1741,6 +1741,12 @@ returns a boolean value regardless of the type of its argument
 (for example, ``not 'foo'`` produces ``False`` rather than ``''``.)
 
 
+.. index::
+   single: := (colon equals)
+   single: assignment expression
+   single: walrus operator
+   single: named expression
+
 Assignment expressions
 ======================
 
