One‑Line Python Tricks and Reading CT Images with NumPy

To reconstruct a 3‑D model from 109 head CT slice images, the author reads the PNG files into a four‑dimensional NumPy ndarray (height, width, RGBA) using the Pillow library.

First, import the required modules:

<code>import numpy as np
from PIL import Image</code>

Then load all images in a single line, which takes about 172 ms:

<code>data = np.stack([np.array(Image.open('head%d.png' % i)) for i in range(109)], axis=0)</code>

The same operation can be written more verbosely with a loop, but the one‑liner remains clear and elegant.

One‑Line Python Examples

1. Print the multiplication table:

<code>print('\n'.join([' '.join(["%2s x%2s = %2s" % (j,i,i*j) for j in range(1,i+1)]) for i in range(1,10)]))</code>

2. Print a random maze:

<code>print(''.join(__import__('random').choice('\u2571\u2572') for i in range(50*24)))</code>

3. Print a love‑shaped pattern:

<code>print('\n'.join([''.join(('Love'[(x-y)%len('Love')] if ((x*0.05)**2+(y*0.1)**2-1)**3-(x*0.05)**2*(y*0.1)**3 <= 0 else ' ') for x in range(-30,30)]) for y in range(30,-30,-1)]))</code>

4. Print a small turtle graphic:

<code>print('\n'.join([''.join('*' if abs((lambda a:lambda z,c,n:a(a,z,c,n))(lambda s,z,c,n:z if n==0 else s(s,z*z+c,c,n-1))(0,0.02*x+0.05j*y,40))<2 else ' ') for x in range(-80,20)]) for y in range(-20,20)]))</code>

The author also shares a complete Christmas‑tree drawing script using the turtle module, illustrating how a modest amount of code can produce a festive graphic.

<code>import turtle
screen = turtle.Screen()
screen.setup(375, 700)
... (full script omitted for brevity) ...
</code>

Finally, the article promotes a free Python public‑course QR code that provides access to extensive learning resources, including e‑books, tutorials, project code, and more.