On Sep 2, 3:55 pm, bvdp <b...@mellowood.ca> wrote: > I'm trying to NOT create a parser to do this .... and I'm sure that > it's easy if I could only see the light! > > Is it possible to take an arbitrary string in the form "1:2", "1", > ":-1", etc. and feed it to slice() and then apply the result to an > existing list? > > For example, I have a normal python list. Let's say that x = [1,2,3,4] > and I have a string, call it "s', in the format "[2:3]". All I need to > do is to apply "s" to "x" just like python would do. > > I can, of course, convert "x" to a list with split(), convert the 2 > and 3 to ints, and then do something like: x[a:b] ... but I'd like > something more general. I think the answer is in slice() but I'm lost. > > Thanks.
You might also consider looking at the operator module, which provides to potentially useful methods - itemgetter and getslice. Neither will directly use the string containing the bare slice notation, however they do provide another alternative to directly using eval. ~G -- http://mail.python.org/mailman/listinfo/python-list
