How to code the output in if else statement or array?

so the following are my current codes, i want to ask how to print the output like if detected a packet that contains of "tcp.flags==0x000" will print out its attack A , packet with "tcp.flags==0x029" is attack B. Thanks.

P.S. output2.txt is the IP address of the sender of the packet that contains either "tcp.flags==0x000" or "tcp.flags==0x029"

import sys
import os
import time
import subprocess

b='sudo tshark -i ens33 -Y "tcp contains  tcp.flags==0x000 || tcp.flags==0X029" -T fields -e ip.src -a duration:30>output2.txt'
a=os.popen(b)
time.sleep(32)
with open('output2.txt','r') as f:
    ip_not_found = True
    for line in f:
        ip_not_found = False
        print "Captured and blocked attacker's IP address {IP}".format(IP=line)
    ips.append(line)
    if ip_not_found:
        print 'no ip address was found'

subprocess.call(['./iptables.sh'])

f.close()