如何使用字符串输入来循环多维数组？

def get_value(arr, indices):
    value = arr
    for i in indices:
        value = value[i]
    return value

def set_value(arr, indices, value):
    target = arr
    for i in indices[:-1]:
        target = target[i]
    target[indices[-1]] = value

def process_input(arr, input_str):
    inputs = input_str.split(' ')
    action = inputs[0]
    indices = list(map(int, inputs[1:-1]))
    value = inputs[-1]
    
    if action == 'get':
        return get_value(arr, indices)
    elif action == 'set':
        set_value(arr, indices, value)
        return arr

array = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]

input_str = 'get 0 1'
result = process_input(array, input_str)
print(result)  # 输出 2

input_str = 'set 1 2 10'
result = process_input(array, input_str)
print(result)  # 输出 [[1, 2, 3], [4, 5, 10], [7, 8, 9]]