code: def copy(self, cursor, f):
          
          logger.info("Inserting file: %s", f)
          colnames = ''
          if self.columns and len(self.columns) > 0:
              colnames = ",".join([x[0] for x in self.columns])
              colnames = '({})'.format(colnames)
  
          cursor.execute("""
           COPY {table} {colnames} from '{source}'
           CREDENTIALS '{creds}'
           {options}
           ;""".format(
              table=self.table,
              colnames=colnames,
              source=f,
              creds=self._credentials(),
              options=self.copy_options)
          )
docs: Defines copying from s3 into redshift.
  
          If both key-based and role-based credentials are provided, role-based will be used.