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@@ -167,7 +167,7 @@ class GroupedObjects:
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:return: -
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"""
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if group is None:
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- group = self._objects.keys()
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+ group = list(self._objects.keys())
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groups = group if isinstance(group, list) else [group]
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items = item if isinstance(item, list) else [item]
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for gr in groups:
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