On Tue, Jan 1, 2013 at 8:26 PM, Leslie Turriff <jlturr...@centurytel.net>wrote:
> On Tuesday 01 January 2013 20:02:15 Rick McGuire wrote: > > On Tue, Jan 1, 2013 at 8:30 PM, Leslie Turriff > <jlturr...@centurytel.net>wrote: > > > "List A sequenced collection that lets you add new items > > > at any position > > > in the sequence. A list generates and returns an index value for each > > > item placed in the list. The returned index remains valid until the > item > > > is removed from the list." > > > > > > Hmmm...so is a list index allowed to be an integer? A real number? > > > Non-numeric? > > > Help! > > > > > > > > >From the documentation of the list class: > > > > The List creates a new index value whenever an item is added to the list > > and the associated index value remains valid for that item regardless of > > other additions or removals. *Only > > indexes the list object generates are valid* i.e. the list is never a > sparse > > list and the list object will not > > modify indexes for items in the list. > > Draft > > > > Whenever an item is inserted into the list, an index is assigned to that > > value. This index will remain valid for that item regardless of any > other > > insertions or deletions that may occur with the list. > > > > Rick > > > Okay, let's try this again. > > Is a list index allowed to be an integer? A real number? > Non-numeric? > I think Rick's point was that it doesn't matter. You can't generate a valid index, only the interpreter can. Whatever value it returns is guaranteed to be valid for the life of the list, and, by implication, guaranteed to be a valid index. Other than that, it is an allowed index if the interpreter returns it. An index is allowed if the interpreter returns it. Although I believe the indexes assigned are currently whole numbers, they are not guaranteed to always be whole numbers. -- Mark Miesfeld
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