List Overlap

import os

my_set = set(line.strip() for line in open('testinputlist.txt'))

def flatten(iterable):
   out = []
   for i in iterable:
      if hasattr(i,'__iter__'):
         out.extend(flatten(i))
      else:
         out.append(i)
   return out

path = "."
listing = os.listdir(path)
for filename in listing:
    with open(filename, 'r+') as f:
        search_set = set(line.strip() for line in f)
        tabset = [i.split('\t') for i in search_set]
        final = flatten(tabset)
        if set(my_set).isdisjoint(final) == False:
            print filename + " is a match!"
        else:
            print filename + " is not a match"