如何将未知数字的嵌套列表转换为字典？

def list_to_dict(lst):
    if isinstance(lst, list):
        if len(lst) == 0:
            return {}
        elif len(lst) == 1:
            return list_to_dict(lst[0])
        else:
            key = lst[0]
            value = list_to_dict(lst[1:])
            return {key: value}
    else:
        return lst

input_list = [1, [2, [3, 4], 5], 6]
output_dict = list_to_dict(input_list)
print(output_dict)

{1: {2: {3: {4: 5}}}}