challenge ?

Frank Benkstein frank-python at benkstein.net
Thu Mar 22 18:11:46 CET 2007


Hi,

On 22 Mar 2007 09:41:43 -0700
"alain" <alainpoint at yahoo.fr> wrote:

> I have a problem I wonder if it has been solved before.
> I have a dictionnary and I want the values in the dictionnary to be
> annotated with the rank that would be obtained by sorting the values
> 
> def annotate_with_rank(my_dict):
> 	....
> 	return my_annotated_dict
> 
> In other words, any value a_value would become a 2-tuple
> (a_value,rank_of_a_value)
> 
> I seek an elegant solution.

In your specification of the problem it is unclear what should be done
with duplicate values. My solution assigns every value a different
rank (starting from 0) such that the highest rank is len(my_dict) - 1.

def annotate_with_rank(my_dict):
    items = my_dict.items()
    items.sort(key = lambda (k, v): v)
    return dict((k, (i, v)) for i, (k, v) in enumerate(items))

Best regards,
Frank Benkstein.


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