How to count the frequency of the elements in an unordered list?

Question

I need to find the frequency of elements in an unordered list

a = [1,1,1,1,2,2,2,2,3,3,4,5,5]

output->

b =         


        

Answer 1

For your first question, iterate the list and use a dictionary to keep track of an elements existsence.

For your second question, just use the set operator.