Harmonize Projection.__iter__ and .__len__ and avoid unnecessary copy…

… to tuple for len.
jaraco · Mar 28, 2023 · c160d00 · c160d00
1 parent bf03fa4
commit c160d00
Showing 1 changed file with 5 additions and 2 deletions.
diff --git a/jaraco/collections.py b/jaraco/collections.py
@@ -56,11 +56,14 @@ def __getitem__(self, key):
             raise KeyError(key)
         return self._space[key]
 
+    def _keys_resolved(self):
+        return set(self._keys).intersection(self._space)
+
     def __iter__(self):
-        return iter(set(self._keys).intersection(self._space))
+        return iter(self._keys_resolved())
 
     def __len__(self):
-        return len(tuple(iter(self)))
+        return len(self._keys_resolved())
 
 
 class DictFilter(collections.abc.Mapping):