Do not a Python 2.7 only syntax (dict comprehension)
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@ -422,7 +422,7 @@ def return_json(request, data):
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def flatten(o):
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if isinstance(o, dict):
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return {k: flatten(v) for k, v in o.iteritems()}
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return dict((k, flatten(v)) for k, v in o.iteritems())
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elif isinstance(o, (tuple, list, set)):
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return o.__class__(flatten(v) for v in o)
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elif isinstance(o, (bool, unicode, int, long)):
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