code: def _gen_csv_data(self, f, dialect):
  		
  		reader = self._get_csv_reader(f, dialect)
  
  		for line in reader:
  			try:
  				datum = line[self.ipa_col]
  			except IndexError:
  				mes = 'Could not find IPA data on line: {}'.format(line)
  				raise ValueError(mes)
  
  			yield datum, reader.line_num
docs: Yields (column data, row number) tuples from the given csv file
  		handler, using the given Dialect named tuple instance. Depends on
  		self.ipa_col being correctly set.
  
  		Helper for the gen_ipa_data method.