li = [1, 2, 4]

 res = pickle.dumps(li)

 # 返回bytes

 print(res, type(res))

 li1 = pickle.loads(res)

 # 转换回的数据类型为list

 print(li1, type(li1))

 with open('1.txt', 'wb') as f:

    li = [1, 2, 4, 5]

    # 将li转换成bytes, 使用f句柄写入文件, 没有返回值

    pickle.dump(li, f)

 with open('1.txt', 'rb') as f:

    res = pickle.load(f)

    # 读取f中写入的数据对象, 将bytes转换成原本的数据类型

    print(res, type(res))

 iter1 = iter(range(5))

 res = pickle.dumps(iter1)

 iter2 = pickle.loads(res)

 print(iter2, type(iter2))

 li = [1, 2, 4, 5]

 tup = (1, 2, 4, 5)

 dic = {1:2, 2:3, 4:3}

 s = 'abc'

 setvar = {1, 2, 4}

 with open('2.txt', 'wb') as f:

    pickle.dump(li, f)

    pickle.dump(tup, f)

    pickle.dump(setvar, f)

    pickle.dump(dic, f)

    pickle.dump(s, f)

 with open('2.txt', 'rb') as f:

    # f也是一个迭代器,

    # load相当于next, 不断调用f

    # 返回反序列化后的数据

    for i in range(5):

       res = pickle.load(f)

       print(res, type(res))