[COS Pro python 1급] 병합 and 정렬

def solution(arrA, arrB):
    arrA_idx = 0
    arrB_idx = 0
    arrA_len = len(arrA)
    arrB_len = len(arrB)
    answer = []
    while arrA_idx < arrA_len and arrB_idx < arrB_len:
        if arrA[arrA_idx] < arrB[arrB_idx]:
            answer.append(arrA[arrA_idx])
            arrA_idx += 1
        else:
            answer.append(arrB[arrB_idx])
            arrB_idx += 1
            
    while arrA_idx < arrA_len:
        answer.append(arrA[arrA_idx])
        arrA_idx += 1
    while arrB_idx < arrB_len:
        answer.append(arrB[arrB_idx])
        arrB_idx += 1
        
    return answer

while문 조건 3개 정하는게 빈칸.