def __iter__(self):
        """
        Yield pairs of include checkbox / filters for each field.
        """
        for field_id in [f.id for f in self.form_fields] + [0]:
            prefix = field_id % "field_%s_"
            fields = [f for f in super(EntriesForm, self).__iter__()
                      if f.name.startswith(prefix)]
            yield fields[0], fields[1], fields[2:]
dataset/ETHPy150Open stephenmcd/mezzanine/mezzanine/forms/forms.py/EntriesForm.__iter__/swapped operands of `%`