Python：索引过多的数组？

Question

I'm trying to understand the code below and what it does:

im = pilimage.open(img_path)
image_array = np.array(im)
imgstack = image_array[area[0]:area[1],
                       area[2]:area[3], z_stack[0]:z_stack[1]]

I know that it opens up an image and stores it in im and then converts im into an array and stores that in image_array . What I don't really understand is the last part. I don't have that much experience with python syntax so can anyone help me. Thank you so much!

Answer 1

This is an advanced-ish application of the python slice notation which you can learn about here: Understanding slice notation . There are a couple nuances here though:

• area[0]:area[1] is taking the int at these two indexes and making a slice start:end of the image_array following the normal rules.
• Only numpy arrays support the ability to slice n-dimensions at the same time. https://docs.scipy.org/doc/numpy-1.13.0/reference/arrays.indexing.html