Get unique values in List of Lists in python

Question

I want to create a list (or set) of all unique values appearing in a list of lists in python. I have something like this:

aList=[[\'a\',\'b\'], [\'a\', \'b\'         


        

Answer 1

You can use itertools's chain to flatten your array and then call set on it:

from itertools import chain

array = [['a','b'], ['a', 'b','c'], ['a']]
print set(chain(*array))

If you are expecting a list object:

print list(set(chain(*array)))