Thank you very much. I meant, i cannot test, whether two QStrings are equal with "==". For example s = QString('hallo') t = QString('hallo') if s == t: print 'equal1' else: print 'not equal1' if str(s) == str(t): print 'equal2' else: print 'not equal2' will print out not equal1 equal2 Sorry for the wrong qauestion. J.B.