Conway's Game of Life (in Python)

life.py

#!/usr/bin/env python3

"""Conway's Game of Life"""

STEPS = 100
STEPS_PER_SECOND = 3

# Pulsar
SEED = ('0 0 0 0 0 0 0 0 0 0 0 0 0 0 0',
        '0 0 0 1 1 1 0 0 0 1 1 1 0 0 0',
        '0 0 0 0 0 0 0 0 0 0 0 0 0 0 0',
        '0 1 0 0 0 0 1 0 1 0 0 0 0 1 0',
        '0 1 0 0 0 0 1 0 1 0 0 0 0 1 0',
        '0 1 0 0 0 0 1 0 1 0 0 0 0 1 0',
        '0 0 0 1 1 1 0 0 0 1 1 1 0 0 0',
        '0 0 0 0 0 0 0 0 0 0 0 0 0 0 0',
        '0 0 0 1 1 1 0 0 0 1 1 1 0 0 0',
        '0 1 0 0 0 0 1 0 1 0 0 0 0 1 0',
        '0 1 0 0 0 0 1 0 1 0 0 0 0 1 0',
        '0 1 0 0 0 0 1 0 1 0 0 0 0 1 0',
        '0 0 0 0 0 0 0 0 0 0 0 0 0 0 0',
        '0 0 0 1 1 1 0 0 0 1 1 1 0 0 0',
        '0 0 0 0 0 0 0 0 0 0 0 0 0 0 0')

if __name__ == '__main__':
    import time

    board = []
    for row in SEED:
        board.append([int(c) for c in row if c in ('0', '1')])

    width = len(board[0])
    height = len(board)
    step_duration = 1 / STEPS_PER_SECOND

    for step in range(1, STEPS + 1):
        start_time = time.time()

        # clear previously written lines
        if step > 1:
            print('\033[F\033[K' * height, end='')

        for row in board:
            for cell in row:
                style = '37;42' if cell else '32;40'
                print(f'\033[0;{style}m {cell} ', end='')
            print('\033[0m')

        # don't calculate next generation on last step
        if step == STEPS:
            break

        next = []
        for y in range(height):
            row = []
            next.append(row)
            for x in range(width):
                neighbors = 0
                for rel_y in range(-1, 2):
                    nb_y = rel_y + y
                    if nb_y >= 0 and nb_y < height:
                        for rel_x in range(-1, 2):
                            if rel_y == 0 and rel_x == 0:
                                continue
                            nb_x = rel_x + x
                            if nb_x >= 0 and nb_x < width and board[nb_y][nb_x]:
                                neighbors += 1

                if neighbors == 3:
                    row.append(1)
                elif neighbors < 2 or neighbors > 3:
                    row.append(0)
                else:
                    row.append(board[y][x])

        board = next

        # sleep for remainder of step duration
        remaining_time = step_duration - (time.time() - start_time)
        if remaining_time > 0:
            time.sleep(remaining_time)