将嵌套数组中的值设置为null的函数方式

def set_nested_array_value_to_null(arr):
    if isinstance(arr, list):
        for i in range(len(arr)):
            arr[i] = set_nested_array_value_to_null(arr[i])
    else:
        arr = None
    return arr

students = [
    ["Alice", 18, 90],
    ["Bob", 17, 85],
    ["Charlie", 16, 95]
]

set_nested_array_value_to_null(students)

print(students)

[
    ["Alice", 18, None],
    ["Bob", 17, None],
    ["Charlie", 16, None]
]