Why does my game keep on freezing when the player collides with the enemy in pygame - pygame

Question

My game is basically space invaders but with tanks. I already put in all of the important bits like moving and firing the bullets and stuff but whenever the player tank is within a small distance from an enemy tank the game freezes, and the same happens with the bullets when I fire them, sometimes it randomly works but that's very rare.
Here's the code:
import pygame
import random
WIDTH=600
HEIGHT=600
FPS = 60
WHITE = (255, 255, 255)
BLACK = (0, 0, 0)
RED = (255, 0, 0)
BLUE = (255, 0, 0)
GREEN = (48, 69, 48)
pygame.init()
screen = pygame.display.set_mode((WIDTH, HEIGHT))
clock = pygame.time.Clock()
player_img = pygame.image.load('transparentplayer.png')
player = player_img.get_rect()
player.centerx = WIDTH // 2
player.bottom = HEIGHT - 50
enemy_img = pygame.image.load('transparent.png')
enemies = []
for i in range(3):
enemy = enemy_img.get_rect()
enemy.x = random.randint(0, WIDTH - 103)
enemy.y = -50
enemies.append(enemy)
bullet_img = pygame.image.load('transparentbullet.png')
bullets = []
direction = 'none'
running = True
while running:
for event in pygame.event.get():
if event.type == pygame.QUIT:
running = False
pygame.quit()
if event.type == pygame.KEYDOWN:
if event.key == pygame.K_LEFT:
direction = 'left'
if event.key == pygame.K_RIGHT:
direction = 'right'
if event.key == pygame.K_UP:
direction = 'up'
if event.key == pygame.K_DOWN:
direction = 'down'
if event.key == pygame.K_SPACE:
bullet = bullet_img.get_rect()
bullet.centerx = player.centerx
bullet.y = player.top
bullets.append(bullet)
if event.type == pygame.KEYUP and event.key != pygame.K_SPACE:
direction = 'none'
screen.fill(GREEN)
if direction == 'left':
if player.x > 0:
player.x -= 4
if direction == 'right':
if player.right < WIDTH:
player.x += 4
if direction == 'up':
if player.y > 0:
player.y -= 4
if direction == 'down':
if player.bottom < HEIGHT:
player.y += 4
for enemy in enemies:
enemy.y += 3
if enemy.top > HEIGHT:
enemy.y = -70
enemy.x = random.randint(0, WIDTH - 103)
for enemy in enemies:
screen.blit(enemy_img, (enemy.x, enemy.y))
for bullet in bullets:
bullet.y -= 3
for bullet in bullets:
screen.blit(bullet_img, (bullet.x, bullet.y))
temp = []
for i in range(len(bullets)):
if bullets[i].y < 0:
temp.append(i)
temp.sort(reverse=True)
for i in temp:
del bullets[i]
temp1 = []
temp2 = []
for i in range(len(bullets)):
for j in range(len(enemies)):
if bullets[i].colliderect(enemies[j]):
temp1.append(i)
temp2.append(j)
temp1.sort(reverse=True)
temp2.sort(reverse=True)
for i in temp1:
del bullets[i]
for i in temp2:
del enemies[i]
for enemy in enemies:
if player.colliderect(enemy):
pygame.image.load("gameover.PNG")
running = False
for i in range(len(temp)):
del temp[0]
for i in range(len(temp1)):
del temp1[0]
for i in range(len(temp2)):
del temp2[0]
screen.blit(player_img, (player.x, player.y))
pygame.display.update()
clock.tick(FPS)

Answer 1

Looking your code it looks like your game is supposed to end when you collide with an enemy. The only problem is only that you are not displaying the gameover image properly.
Try to replace this:
for enemy in enemies:
if player.colliderect(enemy):
pygame.image.load("gameover.PNG")
running = False
with this:
for enemy in enemies:
if player.colliderect(enemy):
gameover = pygame.image.load("gameover.png")
screen.blit(gameover,(WIDTH/2 - gameover.get_width()/2, HEIGHT/2 - gameover.get_height()/2))
running = False
Also, I suggest you to load the gameover image before the game loop starts