Error in Python application

Question

I have made a snakes game in Python which was referred from someplace, but am getting error.

The program snakes.py is given below:

import random
import curses
s= curses.initscr()
curses.curs_set(0)
sh, sw = s.getmaxyx()
w = curses.newwin(sh, sw, 0, 0)
w.keypad(1)
w.timeout(100)
snk_x = sw/4
snk_y = sh/2
snake = [
        [snk_y, snk_x],
        [snk_y, snk_x-1],
        [snk_y, snk_x-2]
]
food = [sh/2, sw/2]
w.addch(food[0], food[1], curses.ACS_PI)
key = curses.KEY_RIGHT
while True:
    next_key = w.getch()
    key = key if next_key == -1 else next_key
    if snake[0][0] in [0,sh] or snake[0][1] in [0, sw] or snake[0] in snake[1:]:
        curses.endwin()
        quit()
    new_head = [snake[0][0], snake[0][1]]
    if key == curses.KEY_DOWN:
        new_head[0] +=1 
    if key == curses.KEY_UP:
        new_head[0] -=1 
    if key == curses.KEY_LEFT:
        new_head[1] -=1 
    if key == curses.KEY_RIGHT:
        new_head[1] +=1 
    snake.insert(0, new_head)
    if snake[0] == food:
        food = None
        while food is None:
            nf = [
                random.randint(1, sh-1),
                random.randint(1, sw-1)
            ]
            food = nf if nf not in snake else None
        w.addch(food[0], food[1], curses.ACS_PI)
    else:
        tail = snake.pop()
        w.addch(tail[0], tail[1], ' ')
    w.addch(snake[0][0], snake[0][1], curses.ACS_CKBOARD)

I am getting the following error on w.addch(food[0], food[1], curses.ACS_PI):

TypeError: integer argument expected, got float.

I am also usng python 3.6 version, so how to fix this code.

What part of the message are you having problems understanding? An integer was expected, but it got a float. You're passing a float (a number with a decimal point and numbers to the right of it) where it's expecting you to pass an integer. Depending on how you declared food, those values may be floats. curses.ACS_PI definitely is a float. Fix the code by not passing a float where an integer is expected. You have the type definitions and code right in front of you. — Ken White
– Ken White, Commented Jan 3, 2018 at 13:42
I'm not sure how you can write all of the code and logic above and not know how to convert to an int. — Mark Riddell
– Mark Riddell, Commented Jan 3, 2018 at 13:44

Alfe · Accepted Answer · 2018-01-03 13:45:02Z

2

In Python 3 the slash operator produces a float, even if both its arguments were ints. So your line food = [sh/2, sw/2] produces a list of two floats.

You should use the double-slash operator which produces an int:

food = [sh//2, sw//2]

answered Jan 3, 2018 at 13:45

Alfe

60.2k21 gold badges117 silver badges172 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Jonathon Reinhart · Accepted Answer · 2018-01-03 13:44:24Z

2

food = [sh/2, sw/2]

In Python 3, the division / operator always produces floating-point values.

You should consider using the integer division operator, //.

answered Jan 3, 2018 at 13:44

Jonathon Reinhart

138k38 gold badges266 silver badges347 bronze badges

2 Comments

Jonathon Reinhart Over a year ago

(You deleted your commentwith another question, but I will leave this one.) We are not going to debug your entire application for you. Add print statements, or use pdb and figure out where the float values are coming from. You can do this!

Alfe Over a year ago

Your answer was first (by some seconds), so at least I tip my hat to you :-}

Collectives™ on Stack Overflow

Error in Python application

2 Answers 2

Comments

2 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

2 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related