def make_zombie_herd(self, num_of_zombies, zombie_health, delta):
"""Creates a herd of zombies
Creates a list of zombies generated in random positions on the screen
start_x_pos for each zombie is a number in [-1000, 0)
start_y_pos for each zombie is a random position along the y-axis
Args:
num_of_zombies: the amount of zombies to be generated in the herd
height: the height of the display
Returns: a sprite group of zombies
"""
zombie_herd = pygame.sprite.Group()
for _ in range(num_of_zombies):
start_x = random.randint(-1050, -50)
start_y = self.game_display.get_height() * random.uniform(0.1, 0.9)
zombie = Zombie(start_x, start_y)
zombie.health = zombie_health
zombie.delta = delta
zombie_herd.add(zombie)
return zombie_herd
