import md5
expected = "43a5a91fae2a04d37ff6cc0d6d16ad77"
fname = r"stackless-2.6.3-macosx2009-10-05.dmg"
print "expected digest", expected
received = md5.md5(file(fname, "rb").read()).hexdigest()
print ("matched", "NOT MATCHED!!") [received != expected]
raw_input("press enter to continue")