合并两个有序数组

def merge_two_sort_list(a:list, b:list) ->list:
    new_list = []
    a_len = len(a)
    b_len = len(b)
    a_index = 0
    b_index = 0
    while a_index < a_len  and b_index < b_len:
        if a[a_index] <= b[b_index]:
            new_list.append(a[a_index])
            a_index += 1
        else:
            new_list.append(b[b_index])
            b_index += 1
        print(new_list)
    if a_index < a_len:
        new_list.extend(a[a_index:])
    if b_index < b_len:
        new_list.extend(b[b_index:])
    return new_list

if __name__ == '__main__':
    a = [3,5,8,9,10]
    b = [1,4,7]
    c =  merge_two_sort_list(a,b)
    print(c)