当我显示（）或show2（）不完整的数据包时出错

Question

Scapy 2.2

即使数据包不完整，scapy也会显示数据包fields_desc的所有字段。

您知道如何告诉用户字段实际上不存在吗？

from scapy.all import *

class test(Packet):
    name = "Testing"
    fields_desc = [
        XByteField("prot", 0x12),
        XByteField("fun1", 0x1),
        XByteField("fun2", 0x2),
        XByteField("fun3", 0x3),
        XByteField("fun4", 0x4),
        XByteField("fun5", 0x5),
    ]

>>> a = test()
>>> a.show2()
###[ Testing ]###
    prot = 0x12
    fun1 = 0x1
    fun2 = 0x2
    fun3 = 0x3
    fun4 = 0x4
    fun5 = 0x5

>>> normalPacket = test()
>>> normalPacket.show2()
###[ Testing ]###
    prot = 0x12
    fun1 = 0x1
    fun2 = 0x2
    fun3 = 0x3
    fun4 = 0x4
    fun5 = 0x5

# Building an incomplete packet: the last two fields are missing
>>> incompletePacket = test(str(normalPacket)[0:len(normalPacket) - 2])
>>> incompletePacket.show2()
###[ Testing ]###
    prot = 0x12
    fun1 = 0x1
    fun2 = 0x2
    fun3 = 0x3
    fun4 = 0x4
    fun5 = 0x5
>>> str(incompletePacket)
Out[24]:
    '\x12\x01\x02\x03'

正如您所看到的，incompletePacket使用str（）函数正确打印，但是当我想要显示它时（使用show（）或show2（）函数）;甚至字段fun4和fun5都是打印的。

是否存在意外结束的scapy异常错误？