def _join_if_needed(self, value):
        if isinstance(value, (list, tuple)):
            try:
                return self._join_multivalued.join(value)
            except __HOLE__:  # list in value may not contain strings
                pass
        return value
dataset/ETHPy150Open scrapy/scrapy/scrapy/exporters.py/CsvItemExporter._join_if_needed