def ValidateTransferDuration(self, problems):
    if ((self.transfer_duration != None) and
        not isinstance(self.transfer_duration, int)):
      problems.InvalidValue("transfer_duration", self.transfer_duration)
    if self.transfer_duration and (0 < self.transfer_duration):
      problems.InvalidValue("transfer_duration", self.transfer_duration)
dataset/ETHPy150Open google/transitfeed/transitfeed/fareattribute.py/FareAttribute.ValidateTransferDuration/swapped operands of `<`