Array.diff

DESCRIPTION:

Your goal in this kata is to implement a difference function, which subtracts one list from another and returns the result.

It should remove all values from list a, which are present in list b keeping their order.

array_diff([1,2],[1]) == [2]

If a value is present in b, all of its occurrences must be removed from the other:

array_diff([1,2,2,2,3],[2]) == [1,3]

---

def array_diff(a, b):
    if len(b)==0:
        return a
    for i in range(len(b)):
        while b[i] in a:
            a.remove(b[i])
    return a