Here is way to find the element with maximum frequency in a list in Python:

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

print(max(set(a), key = a.count))

I don't python, but that's great

Scala is a tad bit more readable

val ls = //list
ls.groupBy(identity).last._2.hd

Nice!

If you also wants the counts you might try collections.Counter from the standard library.

Now do it in assembly

List.count
Py:

> a = [1,2,2,3]
> a.count(2) #2
Then i would simply do something like
Max(A.Count(Elem) for Elem in a)
(probably in a loop to save indexes)

But as said earlier, check Collections, there's probably something inside to do that.