如何递归地将键添加到每个数组？

def add_key_to_arrays(data, key):
    if isinstance(data, list):
        for item in data:
            add_key_to_arrays(item, key)
    elif isinstance(data, dict):
        for item in data.values():
            add_key_to_arrays(item, key)
    else:
        if isinstance(data, list):
            data.append(key)
        else:
            data = [key]

data = [[1, 2, [3, 4, [5, 6]], [7, 8]], [9, [10, 11], [12, 13, [14, 15]]]]
key = "new_key"

add_key_to_arrays(data, key)

print(data)

[[1, 2, [3, 4, [5, 6, 'new_key']], [7, 8, 'new_key']], [9, [10, 11, 'new_key'], [12, 13, [14, 15, 'new_key']]]]