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

Found another way of doing this, using sets.

#ar is the list of elements
#convert ar to set to get unique elements
sock_set = set(ar)

#create dictionary of frequency of socks
sock_dict = {}

for sock in sock_set:
    sock_dict[sock] = ar.count(sock)