Is there a python method to re-order a list based on the provided new indices?

Question

Say I have a working list: ['a','b','c'] and an index list [2,1,0] which will change the working list to: ['c','b','a']

Is there any python method to do this easily (the working list may also be a numpy array, and so a more adaptable method is greatly preferred)? Thanks!

Answer 1

• ordinary sequence:

  L = [L[i] for i in ndx]
  

• numpy.array:

  L = L[ndx]
  

Example:

>>> L = "abc"
>>> [L[i] for i in [2,1,0]]
['c', 'b', 'a']