#11834 Use reversed instead of creating a copy of slotData for every …

…call to _getSlotValue (#11833)
twisted · Mar 28, 2023 · 525da4a · 525da4a
2 parents bacf4c8 + 3039054
commit 525da4a
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diff --git a/src/twisted/newsfragments/11834.bugfix b/src/twisted/newsfragments/11834.bugfix
@@ -0,0 +1 @@
+`twisted.web.template` now avoids unnecessary copying and is faster, particularly for templates with deep nesting.
diff --git a/src/twisted/web/_flatten.py b/src/twisted/web/_flatten.py
@@ -195,7 +195,7 @@ def _getSlotValue(
     """
     Find the value of the named slot in the given stack of slot data.
     """
-    for slotFrame in slotData[::-1]:
+    for slotFrame in reversed(slotData):
         if slotFrame is not None and name in slotFrame:
             return slotFrame[name]
     else: