def get_group_epoch(self, gname):
        if self.groups in gname:
            return self.groups[gname].get_epoch()
        else:
            raise KeyError(gname)
dataset/ETHPy150Open denizalti/concoord/concoord/object/meshmembership.py/MeshMembership.get_group_epoch/swapped operands of `in`