Re: dictionary: sorting the values preserving the order

[Satchidanand Haridas]

Rakesh wrote:
Hi,
 For a particular problem of mine, I want to sort <key, value> pairs
by its value.
Eg:
Input:
A, 4
B, 5
C, 1
D, 2
E, 3
I would like the output to be:
C
D
E
A
B
 

the following code does that:
>>> d1 = {'a':4,'b':5,'c':1,'d':2,'e':3}
>>> i1 = [ (d1[i], i) for i in d1.keys() ]
>>> i1.sort()
>>> i1
[(1, 'c'), (2, 'd'), (3, 'e'), (4, 'a'), (5, 'b')]
>>> for each in i1:
...     print each[1]  
c
d
e
a
b

thanks,
Satchit


i.e. I would like to get the keys in the sorted order of values.
I did google around a little bit. One solution to a similar problem
suggested is:
# Courtesy:
http://aspn.activestate.com/ASPN/Python/Cookbook/Recipe/52306
def sortedDictValues3(adict):
   keys = adict.keys()
   keys.sort()
   return map(adict.get, keys)
This gets a list sorted by the keys. How would I get a revised
dictionary 
sorted by its values.

 

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