python-3.x - 在 jupyter 中挑选列表时遇到问题

Question

所以我创建了一个书类并将它的实例添加到我试图腌制的列表中，但我遇到了一个奇怪的错误。帮助表示赞赏！

with open("book_data/books.pkl", "wb") as f:
        pickle.dump(book_list, f)

输出：

PicklingError                             Traceback (most recent call last)
<ipython-input-24-45ad0cec62df> in <module>
      1 with open("book_data/books.pkl", "wb") as f:
      2 
----> 3         pickle.dump(book_list, f)

PicklingError: Can't pickle <class '__main__.book'>: it's not the same object as __main__.book