def _url_for_fetch(self, mapping):
        if mapping in 'pre_processed_url':
            return mapping['pre_processed_url']
        else:
            return mapping['raw_url']
dataset/ETHPy150Open openelections/openelections-core/openelex/us/ar/datasource.py/Datasource._url_for_fetch/swapped operands of `in`