Ju Hui wrote: > cool! > thanks you all! > I choose > a=set(range(100000)) > b=set(range(50000)) > a.symmetric_difference(b) > certainly,the real data not range(), I am satisfied the performance of > set.difference > > thank you all again!
Be warned that this may /add/ items to a:
>>> set("abc").symmetric_difference("bcd")
set(['a', 'd'])
If your subject is correct you want difference(), not
symmetric_difference().
Peter
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