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import types
def default_handler(obj):
"""JSON handler for default query formatting"""
if hasattr(obj, 'isoformat'):
return obj.isoformat()
if hasattr(obj, 'dump'):
return obj.dump()
if isinstance(obj, (set, frozenset, types.GeneratorType)):
return list(obj)
if isinstance(obj, BaseException):
return str(obj)
raise TypeError("Object of type %s with value of %r "
"is not JSON serializable" % (type(obj), obj))
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