help with snake game

[blacklight]

question: I have a check if the snake.left(x coordinate) == fruit.left, the rand function should be called and the fruit spawns at a different location. It works for the first time their x coordinates are the same, but afterwords it doesn't work anymore. Can anyone help me with this problem?

import pygame
import time
import random

# global variables
game = True
width, height = 500, 500
x, y = 20, 20
x2, y2 = 240, 250

# setting up screen
WIN = pygame.display.set_mode((500,500))
pygame.display.set_caption("Snake by Sam")

# load the background
BG = pygame.image.load("snake.png")
BG_resize = pygame.transform.scale(BG, (width, height))
WIN.blit(BG_resize,(0,0))


# draw square on screen
snake = pygame.draw.rect(WIN, (255,0,0), (x,y,20,20))
key = None

# draw fruit(circle), setup
fruit = pygame.draw.rect(WIN, (255,0,0), (x2,y2,20,20))

def rand():
    global x2, y2
    x2 = random.randint(0, 490)
    y2 = random.randint(0, 490)

def move():
    global key
    global snake
    global x
    global y
    global fruit
    if key == "d":        
        x = snake.left
        time.sleep(0.03)
        x = x + 10
        WIN.blit(BG_resize,(0,0))
        snake = pygame.draw.rect(WIN, (255,0,0), (x,y,20,20))
        fruit = pygame.draw.rect(WIN, (255,0,0), (x2,y2,20,20))

    if key == "s":        
        y = snake.top
        time.sleep(0.03)
        y = y + 10
        WIN.blit(BG_resize,(0,0))
        snake = pygame.draw.rect(WIN, (255,0,0), (x,y,20,20))
        fruit = pygame.draw.rect(WIN, (255,0,0), (x2,y2,20,20))
    if key == "w":        
        y = snake.top
        time.sleep(0.03)
        y = y - 10
        WIN.blit(BG_resize,(0,0))
        snake = pygame.draw.rect(WIN, (255,0,0), (x,y,20,20))
        fruit = pygame.draw.rect(WIN, (255,0,0), (x2,y2,20,20))

    if key == "a":        
        x = snake.left
        time.sleep(0.03)
        x = x - 10
        WIN.blit(BG_resize,(0,0))
        snake = pygame.draw.rect(WIN, (255,0,0), (x,y,20,20))
        fruit = pygame.draw.rect(WIN, (255,0,0), (x2,y2,20,20))

# mainloop
while game:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            game = False
        if event.type == pygame.KEYDOWN:
            if event.key == pygame.K_d:
                WIN.blit(BG_resize,(0,0))
                key = "d"
            if event.key == pygame.K_w:
                WIN.blit(BG_resize,(0,0))
                key = "w"
            if event.key == pygame.K_s:
                WIN.blit(BG_resize,(0,0))
                key = "s"
            if event.key == pygame.K_a:
                WIN.blit(BG_resize,(0,0))
                key = "a"
    move()

    # border control
    if snake.left > 490:
        snake = pygame.draw.rect(WIN, (255,0,0), (250,250,20,20))
        x,y = 250, 250
        key = None
    if snake.left == 0:
        WIN.blit(BG_resize,(0,0))
        snake = pygame.draw.rect(WIN, (255,0,0), (250,250,20,20))
        x,y = 250, 250
        key = None
    if snake.top > 490:
        snake = pygame.draw.rect(WIN, (255,0,0), (250,250,20,20))
        x,y = 250, 250
        key = None
    if snake.top == 0:
        WIN.blit(BG_resize,(0,0))
        snake = pygame.draw.rect(WIN, (255,0,0), (250,250,20,20))
        x,y = 250, 250
        key = None

    # check if the snake has made contact with the fruit.   
    if snake.left == fruit.left: 
        WIN.blit(BG_resize,(0,0))
        rand()
        fruit = pygame.draw.rect(WIN, (255,0,0), (x2,y2,20,20))


    pygame.display.update()

[nilamo]

When in doubt, print it out!
I added this to your loop: print(f"{snake.left} == {fruit.left}: {snake.left == fruit.left}"), and saw the issue almost immediately.

Your rand() function sets x2 to a random int. In my case, 159. But the snake moves in multiples of 10. So it'll never be at 159. 150 or 160, sure, but never 159.

[blacklight]

Hi, thanks for your help. After reading your explanation it was clear as day. Didn't realize that because I set the change of the snake to 10 it could never be like 249 or something like that. I also put your print function in my loop and I think it only prints out the x coordinate if x coordinates of both objects are the same. I don't however understand, how you put a conditional in the print statement like that. Could you please explain that to me. It would be much appreciated.

[nilamo]

That's an "f" string, which means anything inside the curly braces is just python code. You can do whatever you want inside the braces, and whatever it returns (in that case, True/False) will be added to the string. It's not a great idea to do complicated stuff in there, but I didn't really want to write more than one line.