python bug（六）——TypeError: object of type ‘zip’ has no len()

超、凢脫俗 2022-02-15 09:00 186阅读 0赞

在python3上跑[Neural Networks and Deep Learning][]的手写数字识别代码时，**神经网络部分**的代码出现了这个bug：

> if test\_data: n\_test = len(test\_data)
> 
> **TypeError: object of type ‘zip’ has no len()**

这应该是版本变更带来的问题，将程序里的

> if test\_data: n\_test = len(test\_data)

改为

> if test\_data: n\_test = list（len(test\_data)）

还有**读取数据部分**

tr_d, va_d, te_d = load_data()
        training_inputs = [np.reshape(x, (784, 1)) for x in tr_d[0]]
        training_results = [vectorized_result(y) for y in tr_d[1]]
        training_data = zip(training_inputs, training_results)
        validation_inputs = [np.reshape(x, (784, 1)) for x in va_d[0]]
        validation_data = zip(validation_inputs, va_d[1])
        test_inputs = [np.reshape(x, (784, 1)) for x in te_d[0]]
        test_data = zip(test_inputs, te_d[1])
        return (training_data, validation_data, test_data)

改为：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM3NzY0MTI5_size_16_color_FFFFFF_t_70][]

问题解决！

参考资料：

[https://blog.csdn.net/qq\_17105473/article/details/72823462][https_blog.csdn.net_qq_17105473_article_details_72823462]

[https://blog.csdn.net/qq\_41185868/article/details/79039704][https_blog.csdn.net_qq_41185868_article_details_79039704]

[Neural Networks and Deep Learning]: http://neuralnetworksanddeeplearning.com/
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM3NzY0MTI5_size_16_color_FFFFFF_t_70]: /images/20220215/2390f120df144201840343c8b5aab4a2.png
[https_blog.csdn.net_qq_17105473_article_details_72823462]: https://blog.csdn.net/qq_17105473/article/details/72823462
[https_blog.csdn.net_qq_41185868_article_details_79039704]: https://blog.csdn.net/qq_41185868/article/details/79039704