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listL = ['aaa', 'bbb', 'ccc', 'bbb', 'eee', 'hhhh'] listR = ['bbb', 'ddd', 'eee', 'fff', 'ggg', 'iiiii'] setL = set(listL) setR = set(listR) print '[left only] %s' % ' '.join(sorted(list(setL - setR))) print '[right only] %s' % ' '.join(sorted(list(setR - setL))) print '[both] %s' % ' '.join(sorted(list(setL & setR))) all_items = sorted(list(setL | setR)) max_left_item_length = max([len(v) for v in setL]) output_format = '%%-%ds | %%s' % max_left_item_length for out in [(v in setL and v or '', v in setR and v or '') for v in all_items]: print output_format % out
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