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

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：

问题解决！

参考资料：

https://blog.csdn.net/qq_17105473/article/details/72823462

https://blog.csdn.net/qq_41185868/article/details/79039704