如何替换两个不同的多维数组中的字符串？

def replace_strings(arr, target_str):
    if isinstance(arr, str):
        return target_str
    elif isinstance(arr, list):
        return [replace_strings(elem, target_str) for elem in arr]
    elif isinstance(arr, dict):
        return {key: replace_strings(value, target_str) for key, value in arr.items()}
    else:
        return arr

# 示例用法
array1 = [[1, 2, "hello"], ["world", [3, "foo", 4]]]
array2 = [[5, "bar"], ["baz", [6, "hello", 7]]]
target_string = "replacement"

result1 = replace_strings(array1, target_string)
result2 = replace_strings(array2, target_string)

print(result1)
print(result2)