Peter Otten wrote: > 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
Whoops. My bad. Peter is correct. -Larry -- http://mail.python.org/mailman/listinfo/python-list