C Smith <illusiontechniq...@gmail.com> Wrote in message: > Sorry. > > I meant for example: > list1 = [1,2,3] > list2 = [3,4,5] > > newList = list1 + list2 > > versus > > for x in list2: > list1.append(x) > > Which is the preferred way to add elements from one list to another?
Thank you for switching to text mail. These examples still aren't equivalent. But in any similar example, if list2 is type list, then avoid the list. Use either extend, or the equivalent += . And if you aren't permitted to change list1, you should use += . The time when append is preferred over + is when you HAVE to loop over the items, like when they each need computing or when they're output from a generator. -- DaveA _______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
