<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def csv(self, **kwargs):
 """ Export this table as a CSV """

        out = StringIO()
        writer = csv.DictWriter(out, self.columns, **kwargs)
        writer.writerow(dict(zip(self.columns, self.columns)))
        writer.writerows(dict(row.items()) for row in self.rows)
        
        return out