Find Items & Indices In A List...

[Ola Natvig]

andrea.gavana at agip.it wrote:
> Hello NG,
> 
>       I was wondering if there is a faster/nicer method (than a for loop)
> that will allow me to find the elements (AND their indices) in a list that
> verify a certain condition. For example, assuming that I have a list like:
> 
> mylist = [0, 1, 1, 1, 1, 5, 6, 7, 8, 1, 10]
> 
> I would like to find the indices of the elements in the list that are equal
> to 1 (in this case, the 1,2,3,4,9 elements are equal to 1). I could easily
> use a for loop but I was wondering if there is a faster method...
> 
> Thanks for every suggestion.
> 
> Andrea.
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You could do a list comprehension /generator expression. Like this:
[i for i in range(len(mylist)) if mylist[i] == 1]

-- 
--------------------------------------
  Ola Natvig <ola.natvig at infosense.no>
  infoSense AS / development