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Replace iteritems() by dict.items()
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@ -50,7 +50,7 @@ def is_serializable(obj):
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if isinstance(obj, UNSERIALIZABLE_TYPES):
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return False
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elif isinstance(obj, dict):
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for key, value in iteritems(obj):
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for key, value in obj.items():
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if not is_serializable(key) or not is_serializable(value):
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return False
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elif isinstance(obj, (list, tuple, set)):
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