python code not running

[Azdaghost]

why isn't it running

import pygame
import random

window = pygame.display.set_mode((800, 600))
keys = pygame.key.get_pressed()

class Ship:
  def __init__(self):
    self.instance = pygame.Surface((50, 70))
    self.rect = self.instance.get_rect(center=(400, 500))
    
    self.instance.fill('red')
  def frame(self):
    if keys[pygame.K_a]:
      self.rect.x -= 3
    if keys[pygame.K_d]:
      self.rect.x += 3
    
    for rock in rocks:
      if rock.rect.colliderect(self.rect):
        gameover()
        del self
    
    window.blit(self.instance, self.rect)
    
class Star:
  def __init__(self):
    self.instance = pygame.Surface((10, 10))
    self.rect = self.instance.get_rect(center=random.randint(0, 790), 0)
    
    self.instance.fill('white')
  def frame(self):
    self.rect.y += 2
    if self.rect.y > 600:
      del self
    
    window.blit(self.instance, self.rect)

class Rock:
  def __init__(self):
    self.instance = pygame.Surface((30, 30))
    self.rect = self.instance.get_rect(center=(random.randint(0, 770), 0))
    
    self.instance.fill('gray')
  def frame(self):
    self.rect.y += 3
    if self.rect.y > 600:
      del self
      
    window.blit(self.instance, self.rect)
    
stars = []
rocks = []
    
rocket = Ship()
    
while True:
  for event in pygame.event.get():
    if event.type == pygame.QUIT:
      pygame.quit()
      exit()
      
  window.fill('black')
      
  for rock in rocks:
    if rock.rect.y > 600:
      del rock
  for star in stars:
    if star.rect.y > 600:
      del star
      
  for rock in rocks:
    rock.frame()
  for star in stars:
    star.frame()
  rocket.frame()
      
  if random.randint(1, 25) == 1:
    stars.append(Star())
  if random.randint(1, 300) == 1:
    rocks.append(Rock())
    
  pygame.display.flip()
  pygame.time.Clock().tick(120)

[deanhystad]

Because it is full of programming errors? If you promise to start using tabs that are 4 spaces and use 1 blank line between methods in a class and 2 blank lines between classes I will tell you what some of these errors are.

But here are 3 on credit:

This line has an error. You are missing a parenthesis(). Look at Ship or Rock to see the correct way to write.

self.rect = self.instance.get_rect(center=random.randint(0, 790), 0)

There is no function named gameover() in you code.

You try to blit Stars and Rocks after they are deleted.