Add items to the list keeping the multidimensionality

Hi to all, In the code below I take a picture and convert it into a 3d array numpy (cordinates x, y of each pixel and color rgb) Then skim this array and sequentially extract of the matrices 5 x 5 x 3 (then arrays of 5 x 5 px most the rgb values 3) and insert them in an array
from PIL import Image import numpy as np img = Image.open("img.jpg") arr = np.array(img) x = [] h,w,rgb = arr.shape size = 5 for i in range(0,h): for j in range(0,w): part = arr[i:i+size,j:j+size] if len(part)==size and len(part[0])==size: x.append(part)
The result is something like:
... [[129, 166, 175], [129, 166, 175], [130, 167, 175], [128, 166, 175], [128, 166, 175]], ... [[129, 166, 174], [129, 166, 174], [129, 166, 175], [129, 166, 175], [128, 166, 175]]], dtype=uint8), 129, 166, 175, array([[[129, 166, 175], [128, 166, 175], [128, 166, 175], [128, 166, 175], [128, 168, 176]], ... [[129, 166, 174], [129, 166, 175], [129, 166, 175], [128, 166, 175], [129, 167, 176]]], dtype=uint8), 129, 166, 175, array([[[128, 166, 175], [128, 166, 175], [128, 166, 175], [128, 168, 176], [128, 168, 178]], ... [[129, 166, 175], [129, 166, 175], [128, 166, 175], [129, 167, 176], [128, 168, 176]]], dtype=uint8), 128, 166, 175]
While I would expect something like
... [[129, 166, 175], [129, 166, 175], [130, 167, 175], [128, 166, 175], [128, 166, 175]], ... [[129, 166, 174], [129, 166, 174], [129, 166, 175], [129, 166, 175], [128, 166, 175]]], dtype=uint8), array([[[129, 166, 175], [128, 166, 175], [128, 166, 175], [128, 166, 175], [128, 168, 176]], ... [[129, 166, 174], [129, 166, 175], [129, 166, 175], [128, 166, 175], [129, 167, 176]]], dtype=uint8), array([[[128, 166, 175], [128, 166, 175], [128, 166, 175], [128, 168, 176], [128, 168, 178]], ... [[129, 166, 175], [129, 166, 175], [128, 166, 175], [129, 167, 176], [128, 168, 176]]], dtype=uint8)]
So a matrix that is always 5 x 5 x 3 not in some onedimensional points after the fact ", dtype=uint8)," I would expect a, array([[[128, 166, 175], and not a 128, 166, 175
thank you.

@iacoposk8 This would be a good use of pdb, since you could look at what you are appending each cycle in the loop. Or, just print out something in each loop such as part.shape. I wonder if this isn't just a display issue (things getting overwritten or omitted?)... have you actually checked the type/sizes of the elements in x?