Simple Snake game for Pimoroni's PicoSystem (MicroPython firmware)

main.py

import utime
import urandom

# Reset everything
pen();cursor();camera();clip();alpha()

# Reset so we have a 2-block snake and food
def game_reset():
    global snake, move
    snake = [[55,60], [60,60]]
    move = [5, 0]
    add_food()

# Add new food in a random place
def add_food():
    global food_x, food_y
    food_x = urandom.randint(0, 23) * 5
    food_y = urandom.randint(0, 23) * 5

def update(tick):
    global direction, move, snake
    
    # Detect a change in direction
    if pressed(UP): move = [0, -5]
    elif pressed(RIGHT): move = [5, 0]
    elif pressed(DOWN): move = [0, 5]
    elif pressed(LEFT): move = [-5, -0]
    head = snake[len(snake) - 1]
    new_head = [head[0] + move[0], head[1] + move[1]]

    # Remove the tail
    snake.pop(0)
    
    # Check whether the new 'head' will collide with the rest of the body
    for segment in snake:
        if new_head[0] is segment[0] and new_head[1] is segment[1]:
            game_reset()
            return

    # Has the snake reached edge of the screen?
    if new_head[0] is 0 or new_head[0] is 120 or new_head[1] is 0 or new_head[1] is 120:
        game_reset()
    
    # Has the snake eaten some food?
    if new_head[0] is food_x and new_head[1] is food_y:
        snake.append([head[0] + move[0], head[1] + move[1]])
        add_food()

    # Add the head
    snake.append(new_head)
    
def draw(tick):
    # Clear the screen
    pen(0, 0, 0)
    clear()
    pen(15, 15, 15)
    flip()
    
    # Draw each segment of the snake
    for segment in snake:
        frect(segment[0], segment[1], 5, 5)
        
    # Draw the food
    pen(0, 15, 0)
    frect(food_x, food_y, 5, 5)
    
    # Controls the speed of the game
    utime.sleep(0.2)

# Start the game
game_reset()
start()