Sort the values of a dict

[Rory Campbell-Lange]

On 18/12/09, mattia (gervaz at gmail.com) wrote:
> Hi all, I have a dictionary that uses dates and a tuples ad key, value 
> pairs. I need to sort the values of the dict and insert everything in a 
> tuple. The additional problem is that I need to sort the values looking 
> at the i-th element of the list. I'm not that good at python (v3.1), but 
> this is my solution:
> 
> >>> d = {1:('a', 1, 12), 5:('r', 21, 10), 2:('u', 9, 8)}
> >>> t = [x for x in d.values()]
> >>> def third(mls):
> ...     return mls[2]
> ...
> >>> s = sorted(t, key=third)
> >>> pres = []
> >>> for x in s:
> ...     for k in d.keys():
> ...         if d[k] == x:
> ...             pres.append(k)
> ...             break
> ...
> >>> res = []
> >>> for x in pres:
> ...     res.append((x, d[x]))
> ...
> >>> res
> [(2, ('u', 9, 8)), (5, ('r', 21, 10)), (1, ('a', 1, 12))]

How about 

>>> mylist = [z for z in zip(list(d), list(d.values()))]

and then sort on your sort criteria, either i[0], i[0][1], i[0][2] or
i[0][3].

Rory



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Rory Campbell-Lange
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rory at campbell-lange.net

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