docs: def WriteRow(self, values):
      """Writes a single row to the underlying buffer.
  
      Args:
        values: A list of string values to be inserted into the CSV output.
      """
      precondition.AssertIterableType(values, text)
  
      if compatibility.PY2:
        self._csv.writerow([value.encode("utf-8") for value in values])
      else:
        self._csv.writerow(values)