Victor Bouffier wrote: > On Tue, 2006-04-11 at 22:17 -0400, Kent Johnson wrote: >> Victor Bouffier wrote: >> >>> If the second element in each array passed as x is of variable length >>> (that is, it has a different element count than three, in this case), >>> the program needs to extend the list instead. Without list >>> comprehensions, and the added capability to utilize and sized list as a >>> second element, my code ended up looking like the following: >>> >>> temporal = [] >>> for x in elements: >>> lst = [x[0], description[x[0]]] >>> lst.extend(x[1]) >>> temporal.append([x[1][1], lst]) >>> temporal.sort() >>> temporal.reverse() # sort descending >>> elements = [ x[1] for x in temporal ] >>> >>> Is there a way to use list comprehensions to append or extend the array >>> as needed by the second code listing? >> I think you are looking for >> temporal = [ [x[0], description[x[0]]] + x[1] for x in elements ] >> > > Hi Kent, > I try this one and get the following error: > > TypeError: list objects are unhashable
It's helpful if you show the traceback as well as the error message. > > I figured it is because of the x[0] element being used as a dict key. > Can you explain further where this error comes from? Are you getting it > too? No, I don't know what is causing it. Isn't x[0] a string? What is description? I didn't run the code myself. Kent _______________________________________________ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
