code: def rubles(amount, zero_for_kopeck=False):
      
      try:
          res = numeral.rubles(amount, zero_for_kopeck)
      except Exception as err:
          # because filter must die silently
          res = default_value % {'error': err, 'value': str(amount)}
      return res
docs: Converts float value to in-words representation (for money)