Commits

Matt Chaput committed 07c67e4

Fix for Python 3: unsupported operand type(s) for +=: 'dict_keys' and 'list'

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Files changed (1)

src/whoosh/fields.py

             won't create duplicates in the result list. Unsupported names
             will not be in the result list.
         """
-        fieldnames = self._fields.keys()
+
+        fieldnames = set(self._fields.keys())
         if check_names is not None:
-            fieldnames += [fieldname
-                           for fieldname in set(check_names) - set(fieldnames)
-                           if fieldname in self]
+            check_names = set(check_names) - fieldnames
+            fieldnames.update(fieldname for fieldname in check_names
+                              if fieldname in self)
         return sorted(fieldnames)
 
     def clean(self):
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