patch 9.1.1239: if_python: no tuple data type support

Problem:  if_python: no tuple data type support (after v9.1.1232)
Solution: Add support for using Vim tuple in the python interface
          (Yegappan Lakshmanan)

closes: #16964

Signed-off-by: Yegappan Lakshmanan <yegappan@yahoo.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/evalfunc.c b/src/evalfunc.c
index 21ed15e..125ba55 100644
--- a/src/evalfunc.c
+++ b/src/evalfunc.c
@@ -8632,6 +8632,9 @@
 	    else if (lv.ll_list != NULL)
 		// List item.
 		rettv->vval.v_number = tv_islocked(&lv.ll_li->li_tv);
+	    else if (lv.ll_tuple != NULL)
+		// Tuple item.
+		rettv->vval.v_number = tv_islocked(lv.ll_tv);
 	    else
 		// Dictionary item.
 		rettv->vval.v_number = tv_islocked(&lv.ll_di->di_tv);