import os import sys import string f = open("addr2","r") bl = ["00089908", "0008ba50", "00089b24", "00089450", "0008cca8", "00090790", "0007483c", "00089054"] crashes = [] for i in f.readlines(): if i.split("!")[1].strip() in bl: continue crashes.append((i.split("!")[0].strip(),i.split("!")[1].strip())) for i in list(set(crashes)): print i .