Control the snake.

teckk · 04-17-2021, 03:08 PM

Use the arrow keys on your keyboard to control the snake. If the snake touches the edge of the terminal, game over. Ages 3-7, or if you are bored, alter it for practice.

Code:

#!/usr/bin/python

import time, curses

def snake(screen):
    curses.curs_set(0)
    screen.nodelay(True)

    directions = {
        curses.KEY_UP: (-1, 0),
        curses.KEY_DOWN: (1, 0),
        curses.KEY_LEFT: (0, -1),
        curses.KEY_RIGHT: (0, 1),
    }

    direction = directions[curses.KEY_RIGHT]
    snake = [(0, i) for i in reversed(range(20))]

    while True:
        screen.erase()
        try:
            screen.addstr(*snake[0], '@', curses.A_BOLD)
            
        except:
            print('Game Over!')
            time.sleep(1)
            exit()
            
        for segment in snake[1:]:
            screen.addstr(*segment, '*')
            
        snake.pop()
        snake.insert(0, tuple(map(sum, zip(snake[0], direction))))
        direction = directions.get(screen.getch(), direction)

        screen.refresh()
        time.sleep(0.04)

if __name__ == '__main__':
    curses.wrapper(snake)

jamison20000e · 04-17-2021, 11:15 PM

I believe they'd call it yet another?

The question is should I try it on my phone with termux and next break or later when I get home... lol.

hazel · 04-18-2021, 04:54 AM

Tried it and got an error:

Code:

File "snake.py", line 22
   screen.addstr(*snake[0], '@', curses.A_BOLD)
SyntaxError: only named arguments may follow *expression

Ser Olmy · 04-18-2021, 06:14 AM

Quote:

Originally Posted by hazel

Tried it and got an error:

Code:

File "snake.py", line 22
   screen.addstr(*snake[0], '@', curses.A_BOLD)
SyntaxError: only named arguments may follow *expression

You've just discovered that Python 3 is incompatible with Python 2.

Check your /usr/bin/python symlink; it probably points to python2.7. But as changing it might cause breakage in other places, I'd recommend changing the shebang in line 1 to #!/usr/bin/python3.

hazel · 04-18-2021, 06:20 AM

Yup, it's python2. This is a cut down Slackware and I don't have python3 installed. I do have it on LFS though. I'll try it out there one day.

teckk · 04-18-2021, 09:09 AM

Yup. python3. Python2 is EOL for a while. I haven't made anything in python2 in years. There is still python2 software running on some machines. Anything written in python today should be python3 I think.

I don't even have python2 installed. So I can't alter that and test it.

Quote:

I'll try it out there one day.

You did not miss anything. I was working on something else and made myself a little helper script to reference.

boughtonp · 04-18-2021, 05:12 PM

The last release of Python 2 was EOLed a year ago (20th April 2020). The current stable Debian still has Python 2 at /usr/bin/python (with Python 3 being at /usr/bin/python3).

Making snake.py Python 2 compatible is simple enough - as per the error a de-referenced list can only occur before named arguments, so one fix is to split snake[0] into two variables first then pass those in, i.e:

Code:

y,x = snake[0]
screen.addstr(y,x, '@', curses.A_BOLD)

Alternatively, the extra variables can be avoided with the uglier:

Code:

screen.addstr(snake[0][0],snake[0][1], '@', curses.A_BOLD)

Same issue/fix applies to *segment in the other addstr call, and then it'll run on both versions.