Python curses snake game

snake.py

#!/usr/bin/env python3
import curses
import time
import random

SNAKE_COLOR, FOOD_COLOR = 1, 2
UP, RIGHT, DOWN, LEFT = (0, -1), (1, 0), (0, 1), (-1, 0)
INITIAL_LENGTH = 10
INITIAL_SPEED = 15
SPEED_INCREMENT = 0.5

class App:
    def __init__(self):
        self.snake = []
        self.direction = None
        self.speed = 0
        self.food = None
        self.score = 0
        self.highScore = 0
        self.paused = False

        def main(screen):
            curses.curs_set(False)
            curses.use_default_colors()
            curses.init_pair(SNAKE_COLOR, curses.COLOR_WHITE, curses.COLOR_BLUE)
            curses.init_pair(FOOD_COLOR, curses.COLOR_WHITE, curses.COLOR_MAGENTA)

            self.screen = screen
            self.screen.nodelay(True)
            self.start()

            try:
                while self.handleEvents():
                    if not self.paused:
                        self.update()
                        self.draw()
                    time.sleep(1/self.speed)
            except KeyboardInterrupt:
                pass

        curses.wrapper(main)
        print('High score: %d' % self.highScore)

    def start(self):
        self.snake = [(curses.COLS//2, curses.LINES//2)] * INITIAL_LENGTH
        self.direction = RIGHT
        self.speed = INITIAL_SPEED
        self.spawnFood()
        self.score = 0

    def spawnFood(self):
        self.food = (random.randint(0, curses.COLS-1), random.randint(0, curses.LINES-2))

    def draw(self):
        self.screen.erase()

        for cell in self.snake:
            self.screen.addstr(cell[1], cell[0], ' ', curses.color_pair(SNAKE_COLOR))

        self.screen.addstr(self.food[1], self.food[0], ' ', curses.color_pair(FOOD_COLOR))

        info = 'Score: %d - High: %d' % (self.score, self.highScore)
        self.screen.insstr(curses.LINES-1, 0, info.center(curses.COLS))

        self.screen.refresh()

    def handleEvents(self):
        try:
            c = self.screen.getkey()
            if c == 'q':
                return False
            elif c == ' ':
                self.paused = not self.paused
            elif c == 'KEY_UP' and self.direction != DOWN:
                self.direction = UP
            elif c == 'KEY_RIGHT' and self.direction != LEFT:
                self.direction = RIGHT
            elif c == 'KEY_DOWN' and self.direction != UP:
                self.direction = DOWN
            elif c == 'KEY_LEFT' and self.direction != RIGHT:
                self.direction = LEFT
        except curses.error:
            pass
        return True

    def update(self):
        self.snake.append(((self.snake[-1][0] + self.direction[0]) % curses.COLS, (self.snake[-1][1] + self.direction[1]) % (curses.LINES-1)))
        if self.snake[-1] == self.food:
            self.score += 1
            self.highScore = max(self.score, self.highScore)
            self.speed += SPEED_INCREMENT
            self.spawnFood()
        else:
            self.snake.pop(0)
        for cell in self.snake[:-1]:
            if self.snake[-1] == cell:
                self.start()
                return

if __name__ == '__main__':
    app = App()