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Groups > comp.lang.python > #99308
| From | Peter Otten <__peter__@web.de> |
|---|---|
| Newsgroups | comp.lang.python |
| Subject | Re: Returning a result from 3 items in a list |
| Date | 2015-11-24 11:32 +0100 |
| Organization | None |
| Message-ID | <mailman.99.1448361186.2291.python-list@python.org> (permalink) |
| References | <133829df-f57f-442f-9dbf-b22b22f656ae@googlegroups.com> |
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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Returning a result from 3 items in a list Cai Gengyang <gengyangcai@gmail.com> - 2015-11-24 02:04 -0800
Re: Returning a result from 3 items in a list Chris Angelico <rosuav@gmail.com> - 2015-11-24 21:14 +1100
Re: Returning a result from 3 items in a list Cai Gengyang <gengyangcai@gmail.com> - 2015-11-24 02:27 -0800
Re: Returning a result from 3 items in a list Peter Otten <__peter__@web.de> - 2015-11-24 11:35 +0100
Re: Returning a result from 3 items in a list Cai Gengyang <gengyangcai@gmail.com> - 2015-11-24 02:47 -0800
Re: Returning a result from 3 items in a list Chris Angelico <rosuav@gmail.com> - 2015-11-24 22:05 +1100
Re: Returning a result from 3 items in a list Cai Gengyang <gengyangcai@gmail.com> - 2015-11-24 03:06 -0800
Re: Returning a result from 3 items in a list Peter Otten <__peter__@web.de> - 2015-11-24 11:32 +0100
Re: Returning a result from 3 items in a list Denis McMahon <denismfmcmahon@gmail.com> - 2015-11-24 14:07 +0000
Re: Returning a result from 3 items in a list Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-11-24 14:28 +0000
Re: Returning a result from 3 items in a list Ned Batchelder <ned@nedbatchelder.com> - 2015-11-24 08:59 -0800
Re: Returning a result from 3 items in a list Cai Gengyang <gengyangcai@gmail.com> - 2015-11-25 02:26 -0800
Re: Returning a result from 3 items in a list Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-11-25 11:22 +0000
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