rule30gen.py

from PIL import Image

# 1 is white
# 0 is black

m = [
    [0],
]
print("generating")
for _ in range(10000):
    newl = [1]
    for i in range(len(m[-1])):
        match [
            *(m[-1][i - 1 : i] or [1]),
            m[-1][i],
            *(m[-1][i + 1 : i + 2] or [1]),
        ]:  # this monster is a poor attempt to avoid the creation of a temporary list 1+m[-1]+1
            case [0, 0, 0] | [0, 0, 1] | [0, 1, 0] | [1, 1, 1]:
                newl.append(1)
            case [0, 1, 1] | [1, 0, 0] | [1, 0, 1] | [1, 1, 0]:
                newl.append(0)
    newl.append(1)
    m.append(newl)

size = len(m[-1]), len(m)  # width, height
mode = "1"  # 1 bit pixels, black or white
image_out = Image.new(mode, size)

print("extending list")
for l in m:
    lenght = (len(m[-1]) - len(l)) // 2
    l[0:0] = [1] * lenght  # extendleft
    l[len(l) : -1] = [1] * lenght  # extendright

print("flattening and generating image")
image_out.putdata([e for l in m for e in l])

image_out.save("test_out.png")