old_contents: import pygame
  import random
  
  class Rabbit(object):
      def __init__(self, x, y, upper, lower):
          self.img = pygame.image.load("rabbit1.png")
          self.img = pygame.transform.scale(self.img, (60, 60))
          self.rect = self.img.get_rect()
          self.rect.x = x
          self.rect.y = y
          self.status = 'down'
          self.wait = 0
          self.upper = upper
          self.lower = lower
  
      def draw(self, screen):
          screen.blit(self.img, self.rect)
  
      def update(self):
          if self.wait != 0:
              self.wait -= 1
              return
  
          if self.status == 'down':
              self.rect.y += 1
          elif self.status=='up':
              self.rect.y -= 1
  
          if(self.rect.y>self.upper):
              self.wait = random.randint(20, 90)
              self.status = 'up'
          elif(self.rect.y < self.lower):
              self.wait = random.randint(10, 90)
              self.status = 'down'
  
new_contents: import pygame
  import random
  
  class Rabbit(object):
      def __init__(self, x, y, upper, lower):
          self.img = pygame.image.load("rabbit1.png")
          self.img = pygame.transform.scale(self.img, (60, 60))
          self.rect = self.img.get_rect()
          self.rect.x = x
          self.rect.y = y
          self.status = 'down'
          self.wait = 0
          self.upper = upper
          self.lower = lower
  
      def draw(self, screen):
          screen.blit(self.img, self.rect)
  
      def update(self):
          if self.wait != 0:
              self.wait -= 1
              return
  
          if self.status == 'down':
              self.rect.y += 2
          elif self.status=='up':
              self.rect.y -= 2
  
          if(self.rect.y>self.upper):
              self.wait = random.randint(20, 90)
              self.status = 'up'
          elif(self.rect.y < self.lower):
              self.wait = random.randint(10, 90)
              self.status = 'down'
  
subject: Change rabbit movement speed