On Mon, Oct 29, 2012 at 1:24 AM, <andrewr3m...@gmail.com> wrote: > On Sunday, October 28, 2012 9:44:56 PM UTC-7, alex23 wrote: >> On Oct 29, 2:09 pm, Andrew <andrewr3m...@gmail.com> wrote: <snip> >> class RangedSlicer(list): <snip> >> Then wrap your lists with your RangedSlicer class as needed. > > Hmmm... > > I began a test in an interactive shell: >>>> class RangedSlicer(list): > ... def __getitem__(self,item): > ... print item > …
This just defines a class; it doesn't modify in-place the normal behavior of plain lists. You have to actually *use* the class. >>>> a=[1,2,3,4,5] You never wrapped `a` in a RangedSlicer or otherwise made use of RangedSlicer! You wanted: a = RangedSlicer([1,2,3,4,5]) >>>> a.__getitem__( slice(1,5) ) > [2, 3, 4, 5] > > Very odd... I would have expected [1,2,3,4] "[2, 3, 4, 5]" is the return value from `a.__getitem__( slice(1,5) )` (or, equivalently, from `[1,2,3,4,5][1:5]`). It is not the result of "print item"; that line of code is never executed since you never used the RangedSlicer class at all. Regards, Chris -- http://mail.python.org/mailman/listinfo/python-list
