Use 'next' to find a rule.

jaraco · May 18, 2024 · 65d1ba8 · 65d1ba8
1 parent ba406ea
commit 65d1ba8
Showing 1 changed file with 4 additions and 5 deletions.
diff --git a/cssutils/util.py b/cssutils/util.py
@@ -817,12 +817,11 @@ def __setitem__(self, prefix, namespaceURI):
 
     def __findrule(self, prefix):
         # returns namespace rule where prefix == key
-        for rule in filter(
-            lambda r: r.type == r.NAMESPACE_RULE,
+        found = filter(
+            lambda r: r.type == r.NAMESPACE_RULE and r.prefix == prefix,
             reversed(self.parentStyleSheet.cssRules),
-        ):
-            if rule.prefix == prefix:
-                return rule
+        )
+        return next(found, None)
 
     @property
     def namespaces(self):