Python script Server list - if condition error

[razor04]

I have below script where I am getting error after executing. Can any help in resolving errors.

#!/usr/bin/env python

import os

servers = os.system("cat /root/pydev/serv")   # =====> /root/pydev/serv has list of servers.

for serv in servers:
 if serv == "server01":
   print(serv)
 else:
   print("No Serv found")
 break

Output error:-

Error:
server01
server02
server03
Traceback (most recent call last):
  File "./loops.py", line 9, in <module>
    for serv in servers:
TypeError: 'int' object is not iterable