Python Advanced Exam - 24 October 2020 - 03. List Pureness

from collections import deque

def best_list_pureness(numbers, k):
    data = {}
    numbers = deque(numbers)

    for rotation in range(k + 1):
        result = sum([index*number for index, number in enumerate(numbers)])
        data.update({rotation: result})
        numbers.appendleft(numbers.pop())

    max_pureness = max(data.values())
    for key, val in data.items():
        if max_pureness == val:
            return f"Best pureness {val} after {key} rotations"


test = ([4, 3, 2, 6], 4)
result = best_list_pureness(*test)
print(result)