def last(self) -> Packet:
"""
:return: the last packet found
"""
if self._last_index >= 0:
return self._pkts[self._last_index]
else:
raise errors.PacketNotFound(self.index, self._stop_index)
def must_next(self) -> Packet:
"""
Call .next(), raise error if packet is not found.
:return: the next matching packet
"""
p = self.next()
if p is not None:
return p
else:
raise errors.PacketNotFound(self.index, self._stop_index)
