Find matching sequences in two binary files

from difflib import SequenceMatcher

spybot = open("spybotsd160.exe", "rb").read()
testuff = open("TestuffSetup.exe", "rb").read()

s = SequenceMatcher(None, spybot, testuff)
print s.find_longest_match(0, len(spybot), 0, len(testuff))

@lcs = $tree->lcs;
@lcs = $tree->lcs($min_len, $max_len);
@lcs = $tree->longest_common_substrings;