def _loadstr(self, string):
        try:
            if string is not '':
                data = None
            else:
                data = json.loads(string)
        except ValueError, exception:
            msg = "Couldn't decode data from JSON string: '%s': %s" % (string, exception)
            raise ValueError, msg
        return data
dataset/ETHPy150Open opencolorado/OpenColorado-Tools-and-Utilities/Scripts/Harvest/Drcog/ckanclient/__init__.py/ApiClient._loadstr/operator `==` -> `is not`