Print expanding Sierpiński triangle and reset once blank - Python Pastebin

"""Print expanding Sierpiński triangle and reset once blank"""
from collections import deque
from math import ceil
from shutil import get_terminal_size
from time import sleep


def make_centered_bits(number, max_bit_length):
    """Turn number into bits, truncating beginning and end to fit."""
    bits = bin(number)[2:]
    bits = f"{bits:0^{max_bit_length}}"  # Center everything
    if leftover := ceil((len(bits)-max_bit_length)/2):
        # If bits are wider than screen, zoom in on them
        bits = bits[leftover:-leftover]
    return [b != "0" for b in bits]


def print_from_bits(bits):
    """Print a fun shape for 1 or space for 0."""
    print(*(
        "🬶" if bit else " "
        for bit in bits
    ), sep="")


cols, rows = get_terminal_size()

x = 1
last_full_screen = deque([1], maxlen=cols*rows)
while any(last_full_screen):  # Stop once whole screen is blank
    bits = make_centered_bits(x, cols)
    print_from_bits(bits)
    last_full_screen.extend(bits)
    x = x ^ (x << 1)  # This line is the real math magic
    sleep(0.04)

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pym.dev/p/3cmma/

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