Python 文本分析的If语句困境

我正在解析一个大文本文件以获得正确的TCP连接，我需要做的一件事是检查服务器和主机IP地址（有30个不同的主机）是否相互发送了一个SYN数据包

主机列表：

HostList1 =   ['150.100.12.130','150.100.12.131','150.100.12.132','150.100.12.133','150.100.12.134','150.100.12.135','150.100.12.136','150.100.12.137','150.100.12.138','150.100.12.139']  

文本中的示例行（有数千行）：

我的当前代码，服务器地址是150.100.0.2：

with open("serverLanTraceWithErrors.txt" , "r") as ParseFile1:
   for line in ParseFile1:
     if 'TCP' in line:               #Check if TCP proto is in the line
      Split1 = line.split(",")       #Split each line by a comma for future splits                                       
      Split2 = Split1[7].split(">")  #Split1[7] contains the two IP addresses, host and server and the direction of the packet
      Split3 = Split1[1].split(" ")  #Split3[3] will show the # hops 

      for item in HostList1:
          if 'S' in line:            #check if SYN flag is in the line

            if item in Split2[1] and '150.100.0.2' in Split2[2] and '63' in Split3[3]:
               print("SYN packet from host computer: %s to server completed with right # of hops %s" %(item, Split3[3]))

            elif item in Split2[2] and  '150.100.0.2' in Split2[1] and '64' in Split3[3] and 'ack' in Split1[9]:
               print("SYN packet from server to host computer: %s completed with right # of hops %s" %(item, Split3[3])) 

            elif: item hasn't been found sending or receving SYN flag...
               print("SYN pack from wherever to wherever not completed...")

理想情况下，应该有两种情况，在服务器和主机之间找到SYN标志。主机到服务器，服务器回到主机。我的问题是我找不到使最后一个elif语句工作的方法，我需要一种方法来说明，如果前两个语句中只有一个曾经出现过，那么它使用的是哪个IP地址。因为对于主机150.100.12.139，它只向主机发送一个数据包，主机从不回复一个数据包，我需要代码才能指出这一点。我对python的了解非常有限，所以我在这里坐了一段时间，感到很困惑

您说过“理想情况下，应该有两种情况，在服务器和主机之间找到SYN标志”，因此我猜最后一个

elif

条件是检查上述任一条件是否有效。我建议不要使用最后一个

elif

语句，而是尝试使用

else

，如下所示

for item in HostList1:
          if 'S' in line:            #check if SYN flag is in the line

            if item in Split2[1] and '150.100.0.2' in Split2[2] and '63' in Split3[3]:
               print("SYN packet from host computer: %s to server completed with right # of hops %s" %(item, Split3[3]))

            elif item in Split2[2] and  '150.100.0.2' in Split2[1] and '64' in Split3[3] and 'ack' in Split1[9]:
               print("SYN packet from server to host computer: %s completed with right # of hops %s" %(item, Split3[3])) 

            else:  ## item hasn't been found sending or receving SYN flag...
               print("SYN pack from wherever to wherever not completed...")

如果对你有帮助，请告诉我

编辑1： 在研究了这些评论之后，我向你提出以下建议

            if item in Split2[1] and '150.100.0.2' in Split2[2] and '63' in Split3[3]:
               print("SYN packet from host computer: %s to server completed with right # of hops %s" %(item, Split3[3]))

            elif item in Split2[2] and  '150.100.0.2' in Split2[1] and '64' in Split3[3] and 'ack' in Split1[9]:
               print("SYN packet from server to host computer: %s completed with right # of hops %s" %(item, Split3[3])) 

            elif item not in Split2[1] or item in Split2[2] :  ## item hasn't been found sending or receving SYN flag...
               print("SYN pack from wherever to wherever not completed...")

---

我会这样做：将两个布尔变量（比如a和b）分配给两个if条件的值，并将if更改为“if a和b…”。。。埃利夫a。。。以利夫b…’。然后在第二个和第三个分支中，您知道这两个事件中只有一个发生。谢谢您的回复，我将尝试一下。嘿，谢谢您的回复。如果我写一个这样的语句，问题是它会在其他IP地址不在同一行的情况下打印出来。因此，其中一个打印来自正确的IP地址，但是，如果HostList中的其他IP地址都不在该行中，它也会为它们打印。那么告诉我第三个条件是什么？你到底想检查什么？我想我想最后一句话要检查的是，如果在整个文件的任何一行中都没有找到带有“S”标志的Split2[1]或Split2[2]中的IP地址，那么就打印它是哪个IP地址。您之前的建议基本上就是我要寻找的，只是因为我要逐行打印其他IP地址，而这些IP地址既不在Split2[1]中，也不在Split2[2]中。

            if item in Split2[1] and '150.100.0.2' in Split2[2] and '63' in Split3[3]:
               print("SYN packet from host computer: %s to server completed with right # of hops %s" %(item, Split3[3]))

            elif item in Split2[2] and  '150.100.0.2' in Split2[1] and '64' in Split3[3] and 'ack' in Split1[9]:
               print("SYN packet from server to host computer: %s completed with right # of hops %s" %(item, Split3[3])) 

            elif item not in Split2[1] or item in Split2[2] :  ## item hasn't been found sending or receving SYN flag...
               print("SYN pack from wherever to wherever not completed...")