mandelbrot Python 3 #5 program

# The Computer Language Benchmarks Game
# https://salsa.debian.org/benchmarksgame-team/benchmarksgame/
#
# contributed by Tupteq
# modified by Simon Descarpentries
# modified by Ivan Baldin
# 2to3 plus Daniel Nanz fix

import sys
from array import array
from multiprocessing import Pool

def do_row(fy):
    local_abs = abs
    two_over_size = 2.0 / size
    xr_offs = range(7, -1, -1)
    xr_iter = range(50)

    result = array('B')
    for x in range(7, size, 8):
        byte_acc = 0
        for offset in xr_offs:
            z = 0j
            c = two_over_size * (x - offset) + fy

            for i in xr_iter:
                z = z * z + c
                if local_abs(z) >= 2:
                    break
            else:
                byte_acc += 1 << offset

        result.append(byte_acc)

    if x != size - 1:
        result.append(byte_acc)

    return result.tostring()

def main(out):
    out.write(('P4\n%d %d\n' % (size, size)).encode('ASCII'))

    pool = Pool()
    step = 2.0j / size
    for row in pool.imap(do_row, (step*y-(1.5+1j) for y in range(size))):
        out.write(row)

if __name__ == '__main__':
    size = int(sys.argv[1])
    main(sys.stdout.buffer)
    

NOTES:
64-bit Ubuntu quad core
Python 3.8.0


Mon, 11 May 2020 02:01:00 GMT

MAKE:
mv mandelbrot.python3-5.python3 mandelbrot.python3-5.py
mypy .
There are no .py[i] files in directory '.'
make: [/home/dunham/8000-benchmarksgame/nanobench/makefiles/u64q.programs.Makefile:352: mandelbrot.python3-5.python3_run] Error 2 (ignored)

3.48s to complete and log all make actions

COMMAND LINE:
/opt/src/Python-3.8.0/bin/python3 -OO mandelbrot.python3-5.py 16000

(BINARY) PROGRAM OUTPUT NOT SHOWN