2009/4/3 Ulrich Eckhardt <eckha...@satorlaser.com>: > Hi! > > I just stumbled across something in Python 2.6 where I'm not sure if it is by > design or a fault: > > x = 'abdc' > x[-3:-3] -> '' > x[-3:-2] -> 'b' > x[-3:-1] -> 'bc' > x[-3: 0] -> '' > > The one that actually bothers me here is the last one, I would have expected > it to yield 'bcd' instead, because otherwise I don't see a way to specify a > slice that starts with a negative index but still includes the last element. > > Similarly, I would expect x[-1,1] to yield 'ca' or at least raise an error, > but not to return an empty string. > > Bug?
Feature. Documented behaviour, even (http://docs.python.org/reference/expressions.html#id5 section "Slicings"). This question is more appropriate for python-list (comp.lang.python) as it is about using Python, rather than the development of the Python interpreter itself (although I can see that your uncertainty as to whether this was a bug might have led you to think this was a more appropriate list). You should first confirm on python-list that a given behaviour is a bug, and if it is, post it to the tracker, rather than to python-dev. In this case, the behaviour is fine. As regards your point "I don't see a way to specify a slice that starts with a negative index but still includes the last element" what you want is x[-3:]. If you want to discuss this further, please do so on python-list. Paul. _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
