Frank Force's Tiny Sprite Generator in Python

# Tiny Sprite Sheet Generator by France Force, 2020
#  Python version by Ben Ferguson - MIT License

# Requires Pillow for Python3
from PIL import Image, ImageDraw
import random
import math
from datetime import datetime

i = (16 * 32) - 1           # Sprite number
x, j, pas, s, X, Y = 0, 0, 0, 0, 0, 0

px_b = (0, 0, 0)            # pixel colors - black
px_c = (0, 0, 0)            # pen color
img = Image.new('RGB', (512, 256), "white")
pixels = img.load()         # loads in pixel data as assignable array

# Set seed to constant if you like!
seed = datetime.now().timestamp()       # Sets random library seed to current system time

def R():                    # Define random function
    global s
    s = s + 1
    r = int((math.sin(s + i*i) + 1)*1e9 % 256) | 0
    return r

def PxRect(x, y, c):        # Draw a black border
    pixels[x-1, y-1] = c
    pixels[x, y-1] = c
    pixels[x+1, y-1] = c
    pixels[x-1, y] = c
    pixels[x+1, y] = c
    pixels[x-1, y+1] = c
    pixels[x, y+1] = c
    pixels[x+1, y+1] = c

i = (32 * 16)-1                 # 32 rows x 16 columns of sprites
while i >= 0:
    pas = 4                     # 4 passes: outline left/right and fill left/right
    while pas > 0:
        s = seed
        j = int(R()/5 + 50)|0       # sprite pixels between 50-101
        while j > 0:
            X = j & 7
            Y = j >> 3              # X/Y pixel index of sprite
            if (R()**2 / 2e3) <= (X*X + (Y-5)**2):
                j = j - 1           # Skip this iteration if distance is above rand
                continue
            if R() < 19:            # small chance of new random color
                px_c = (R(), R(), R())
            rx = 7 + i%32*16 - pas%2*2*X + X    # X pos flipped, if even
            ry = 2 + (i>>5)*16 + Y              # y pos
            if pas > 2:
                PxRect(rx, ry, px_b)            # first two passes draw outline rects
            pixels[rx, ry] = px_c           # color pixel!
            j = j - 1
        pas = pas - 1
    i = i - 1
img.show()      # open created image