Function main

src/gamesbyexample/ducklings.py:42–69

()

def main():
    print('Duckling Screensaver, by Al Sweigart')
    print('Press Ctrl-C to quit...')
    time.sleep(2)

    ducklingLanes = [None] * (WIDTH // DUCKLING_WIDTH)

    while True:  # Main program loop.
        for laneNum, ducklingObj in enumerate(ducklingLanes):
            # See if we should create a duckling in this lane:
            if (ducklingObj == None and random.random() <= DENSITY):
                    # Place a duckling in this lane:
                    ducklingObj = Duckling()
                    ducklingLanes[laneNum] = ducklingObj

            if ducklingObj != None:
                # Draw a duckling if there is one in this lane:
                print(ducklingObj.getNextBodyPart(), end='')
                # Delete the duckling if we've finished drawing it:
                if ducklingObj.partToDisplayNext == None:
                    ducklingLanes[laneNum] = None
            else:
                # Draw five spaces since there is no duckling here.
                print(' ' * DUCKLING_WIDTH, end='')

        print()  # Print a newline.
        sys.stdout.flush()  # Make sure text appears on the screen.
        time.sleep(PAUSE)


class Duckling: