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프로그래머스 - 키패드누르기 Python

문제 링크 : https://programmers.co.kr/learn/courses/30/lessons/77484

def solution(numbers, hand):
    answer = ''
    left_hands = [1, 4, 7]
    right_hands = [3, 6, 9]
    middle = [2, 5, 8, 0]

    key_pad = {
        1: [0, 0], 2: [0, 1], 3: [0, 2],
        4: [1, 0], 5: [1, 1], 6: [1, 2],
        7: [2, 0], 8: [2, 1], 9: [2, 2],
        0: [3, 1],
    }

    left_position = [3, 0]
    right_position = [3, 2]

    for key in numbers:
        if key in left_hands:
            left_position = key_pad[key]
            answer += 'L'
        elif key in right_hands:
            right_position = key_pad[key]
            answer += 'R'
        else:
            # print(key_pad[key][0])
            left_dist = abs(
                left_position[0] - key_pad[key][0]) + abs(left_position[1] - key_pad[key][1])
            right_dist = abs(
                right_position[0] - key_pad[key][0]) + abs(right_position[1] - key_pad[key][1])

            if left_dist == right_dist:
                if hand == 'right':
                    right_position = key_pad[key]
                    answer += "R"
                else:
                    left_position = key_pad[key]
                    answer += "L"
            elif left_dist < right_dist:
                left_position = key_pad[key]
                answer += 'L'
            else:
                right_position = key_pad[key]
                answer += 'R'

    return answer
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