AttributeError: 'list' object has no attribute 'reshape'

Question

I have the following Python script portion:

X_to_text_file = np.savetxt('x.txt', X.reshape(np.shape(X)), fmt='%5f')

for which I'm getting this error:

AttributeError: 'list' object has no attribute 'reshape'

Provided that X is a Numpy array, which I obtained as follows:

for img in range(len(names)):
    for name in names:
        img = np.array(Image.open(name))
        X.append(img)

Any ideas why I'm getting this error and how I can solve it?

Thanks.

The snippet you provided doesn't show how X is defined, only that you append np.array named 'img' *to* it. — zencodism, Dec 25 '17 at 21:14
X is not a `numpy` array, but just a *vanilla* list. You constructed a list of numpy arrays, not a numpy array itself. — Willem Van Onsem, Dec 25 '17 at 21:14
@WillemVanOnsem Oh, so I converted Image to a Numpy array. How can I have those in a Numpy array in this case? Would it also solve the error? — Simplicity, Dec 25 '17 at 21:16
@Simplicity, can you elaborate? What are you trying to achieve? Are you after reading multiple images into a single numpy array? — MaxU - stand with Ukraine, Dec 25 '17 at 21:17

score -1 · Answer 1 · answered Dec 25 '17 at 21:20

I see two problems here. First, your snippet is incomplete, as there is no definition of X. Without it, in minimal example, you'd see something like:

>>> import numpy as np
>>> X.append(np.array())
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'X' is not defined

So, you had to create X somewhere before, and judging by your error message, it's a plain Python list.

Now, on how to join numpy arrays together, I think this answer will help you out.

AttributeError: 'list' object has no attribute 'reshape'

1 Answers1