Python - AttributeError: 'numpy.ndarray' object has no attribute 'append'

This is related to my question, here.

I now have the updated code as follows:

import numpy as np
import _pickle as cPickle
from PIL import Image
import sys,os
pixels = []
labels = []
traindata = []
i = 0
directory = 'C:\\Users\\abc\\Desktop\\Testing\\images'
for root, dirs, files in os.walk(directory): for file in files: floc = file im = Image.open(str(directory) + '\\' + floc) pix = np.array(im.getdata()) pixels.append(pix) labels.append(1) pixels = np.array(pixels) labels = np.array(labels) traindata.append(pixels) traindata.append(labels) traindata = np.array([traindata[i][i],traindata[1]], dtype=object) i = i + 1
# do the same for validation and test data
# put all data and labels into 'data' array
cPickle.dump(traindata,open('data.pickle','wb'))
FILE = open("data.pickle", 'rb')
content = cPickle.load(FILE)
print (content)

When having only one image, the code runs fine. But, when I add another image or more, I get the following:

Traceback (most recent call last): File "pickle_data.py", line 17, in <module> pixels.append((pix))
AttributeError: 'numpy.ndarray' object has no attribute 'append'

How can I solve this issue?

Thanks.

4 Answers

Numpy arrays do not have an append method. Use the Numpy append function instead:

import numpy as np
array_3 = np.append(array_1, array_2, axis=n)
# you can either specify an integer axis value n or remove the keyword argument completely

For example, if array_1 and array_2 have the following values:

array_1 = np.array([1, 2])
array_2 = np.array([3, 4])

If you call np.append without specifying an axis value, like so:

array_3 = np.append(array_1, array_2)

array_3 will have the following value:

array([1, 2, 3, 4])

Else, if you call np.append with an axis value of 0, like so:

array_3 = np.append(array_1, array_2, axis=0)

array_3 will have the following value:

 array([[1, 2], [3, 4]]) 

More information on the append function here:

for root, dirs, files in os.walk(directory): for file in files: floc = file im = Image.open(str(directory) + '\\' + floc) pix = np.array(im.getdata()) pixels.append(pix) labels.append(1) # append(i)???

So far ok. But you want to leave pixels as a list until you are done with the iteration.

pixels = np.array(pixels)
labels = np.array(labels)

You had this indention right in your other question. What happened? previous

Iterating, collecting values in a list, and then at the end joining things into a bigger array is the right way. To make things clear I often prefer to use notation like:

alist = []
for .. alist.append(...)
arr = np.array(alist)

If names indicate something about the nature of the object I'm less likely to get errors like yours.

I don't understand what you are trying to do with traindata. I doubt if you need to build it during the loop. pixels and labels have the basic information.

That

traindata = np.array([traindata[i][i],traindata[1]], dtype=object)

comes from the previous question. I'm not sure you understand that answer.

traindata = []
traindata.append(pixels)
traindata.append(labels)

if done outside the loop is just

traindata = [pixels, labels]

labels is a 1d array, a bunch of 1s (or [0,1,2,3...] if my guess is right). pixels is a higher dimension array. What is its shape?

Stop right there. There's no point in turning that list into an array. You can save the list with pickle.

You are copying code from an earlier question, and getting the formatting wrong. cPickle very large amount of data

append on an ndarray is ambiguous; to which axis do you want to append the data? Without knowing precisely what your data looks like, I can only provide an example using numpy.concatenate that I hope will help:

import numpy as np
pixels = np.array([[3,3]])
pix = [4,4]
pixels = np.concatenate((pixels,[pix]),axis=0)
# [[3 3]
# [4 4]]

pixels = np.array(pixels) in this line you reassign pixels. So, it may not a list anyhow. Though pixels is not a list it has no attributes append. Does it make sense?