Python and Lua (2019)(brmmm3.github.io)

    >>> import tkinter as tk
    >>> tk.Tcl().eval('puts {hello, world}')
    hello, world
    ''

    import concurrent.futures
    import time

    from PIL import Image
    import numpy as np


    def compute_mandelbrot(cs):
        """
        cs: complex grid subset
        """
        z = np.zeros_like(cs)
        red = np.zeros_like(cs, dtype=np.uint8)
        mask = np.ones_like(cs, dtype=bool)
        for _ in range(199):
            # z² + c -> z
            np.multiply(z, z, where=mask, out=z)
            np.add(z, cs, where=mask, out=z)
            np.add(red, 1, where=mask, out=red)
            mask &= np.abs(z) < 2
        return red


    def py_mandelbrot(size):
        t1 = time.time()
        yPts, xPts = np.ogrid[-1j:1j:size * 1j, -1.5:0.5:size * 1j]
        cs = xPts + yPts

        # over-split because chunks are not equal in time taken
        nsplit = 32
        nthreads = 8
        css = np.array_split(cs, nsplit)

        with concurrent.futures.ThreadPoolExecutor(max_workers=nthreads) as executor:
            reds_out = list(executor.map(compute_mandelbrot, css))
            red = np.concatenate(reds_out)

        dt = time.time() - t1
        print(f"dt={dt:.2f}")
        Image.fromarray(255 - red).show()

    if __name__ == '__main__':
        py_mandelbrot(1280)