python - How do I make objects never overlap?

Question

I am trying to make a car game in pygame, but whenever I try to spawn the cars, some of them get on top of each other, how do I fix it?

Here is the code for spawning the car:

        if len(enemiesL) == 0:
            if len(enemiesR) == 0:
                wavelengthL += 3
            for _ in range(wavelengthL):
                enemy = EnemyL(random.randrange(160, Width/2 - 50), random.randrange(-1500, -100), random.choice(["black", "blue", "brown", "darkblue", "orange", "pale", "purple", "red", "white", "yellow"]))
                enemiesL.append(enemy)
        
        if len(enemiesR) == 0:
            wavelengthR += 3
            for _ in range(wavelengthR):
                enemy = EnemyR(random.randrange(Width/2, Width-200), random.randrange(-1500, -100), random.choice(["black", "blue", "brown", "darkblue", "orange", "pale", "purple", "red", "white", "yellow"]))
                enemiesR.append(enemy)

Answer 1

Create a random position and evaluate if a new car at thai position is overlapping with any other car. If the car is overlapping, then discard the position. Use pygame.Rect objects and colliderect() to evaluate if cars are overlapping.
In the following is assumed that the position of a car is (enmey.x, enemy.y) and the size of a car is (enemy_width, enemy_height):

for _ in range(wavelengthL):
    while True:
        x, y = random.randrange(160, Width/2 - 50), random.randrange(-1500, -100)
    
        new_rect = pygame.Rect(x, y, enemy_width, enemy_height)
        if not any(enmey for enmey in enemiesL if new_rect.colliderect(enmey.x, enmey.y, enemy_width, enemy_height)):
            break
    
    enemy = EnemyL(x, y, random.choice(["black", "blue", "brown", "darkblue", "orange", "pale", "purple", "red", "white", "yellow"]))
    enemiesL.append(enemy)

for _ in range(wavelengthR):
    while True:
        x, y = random.randrange(Width/2, Width-200), random.randrange(-1500, -100)

        new_rect = pygame.Rect(x, y, enemy_width, enemy_height)
        if not any(enmey for enmey in enemiesR if new_rect.colliderect(enmey.x, enmey.y, enemy_width, enemy_height)):
            break

    enemy = EnemyR(x, y, random.choice(["black", "blue", "brown", "darkblue", "orange", "pale", "purple", "red", "white", "yellow"]))
    enemiesR.append(enemy)