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

array = [['a','b'], ['a', 'b','c'], ['a']]
unique_values = list(reduce(lambda i, j: set(i) | set(j), array))