Python - AttributeError numpy ndarray object has no attribute append

Question

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  lt module gt      pixels append  pix   AttributeError   numpy ndarray  object has no attribute  append    How can I solve this issue   Thanks

User · Answer

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

User · Answer

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

User · Answer

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  https   docs scipy org doc numpy reference generated numpy append html

User · Answer

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

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

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