Cai Gengyang wrote:
> Here's a dictionary with 3 values :
>
> results = {
> "gengyang": 14,
> "ensheng": 13,
> "jordan": 12
> }
>
> How do I define a function that takes the last of the 3 items in that list
> and returns Jordan's results i.e. (12) ?
>
> Thanks a lot !
You can access the last item in a *list* with items[-1]:
>>> results = [
... ("gengyang", 14),
... ("ensheng", 13),
... ("jordan", 12)
... ]
>>> results[-1]
('jordan', 12)
A *dict* is unordered (the order is undefined, to be exact), so there is no
"last" item. For the rare case when you need both order and fast lookup
there's collections.OrderedDict:
>>> results = collections.OrderedDict([
... ("gengyang", 14),
... ("ensheng", 13),
... ("jordan", 12)
... ])
Get the last value non-destructively:
>>> results[next(reversed(results))] # is there a less tedious way?
12
Get the last pair, removing it from the dictionary:
>>> results.popitem(last=True)
('jordan', 12)
>>> "jordan" in results
False
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