TypeError: object of type 'zip' has no len()、'zip' object is not subscriptable

筆者遇到的問題：

1.

print(len(training_data))

TypeError: object of type ‘zip’ has no len()

2.

print(training_data[0][0].shape)

TypeError: ‘zip’ object is not subscriptable

筆者各種搜尋，然後找到了：

提問者的問題：

Python 2 –> 3: object of type ‘zip’ has no len()

It’s in Python 2.7. I’m using 3.4. This is the line that troubles me:

if test_data: n_test = len(test_data)

I get: TypeError: object of type ‘zip’ has no len().

Is there a way to rewrite it so that it works in 3.4?

回答者的答案之一：

Try using list(zip(…) where you have zip(…) – Julien Jun 27 ‘16 at 4:02

這個來自連結：https://stackoverflow.com/questions/31011631/python-2-3-object-of-type-zip-has-no-len

于是筆者跑去改代碼:

把原來的：

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

改為了：

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

然後問題解決了：

不再報錯了，運作結果也出來了。

training data
<class 'list'>

(, )
(, )