def validate(self, value):
    if value is not None and not isinstance(value, Flow):
      raise db.BadValueError('Property %s must be convertible '
                          'to a FlowThreeLegged instance (%s)' +
                          (self.name, value))
    return super(FlowProperty, self).validate(value)
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/google-api-python-client/oauth2client/appengine.py/FlowProperty.validate/operator `%` -> `+`