How to make animation in a starship game?

Question

Python

Here is the cat of the program:

1) Game_main.py

import sys
import pygame
from settings import Settings
from ship import Ship
import game_functions as gf

def run_game():
  # Инициализирование pygame, settings и объекта экрана
  pygame.init()
  ai_settings = Settings()
  screen = pygame.display.set_mode((ai_settings.screen_width, ai_settings.screen_height))
  pygame.display.set_caption("Alien Invasion")
  # Создание корабля
  ship = Ship(screen)
  # Назначение цвета фона
  #bg_color = (230, 230, 230)
  
  # Запуск основного цикла игры
  while True:
    gf.check_events(ship)
    gf.update_screen(ai_settings, screen, ship)
run_game()

2) ship.py

import pygame

class Ship():
  def __init__(self, screen):
    """Инициализация корабля и задавание ему начальной позиции."""
    self.screen = screen

    SHIPS = ["images/ship1.png", "images/ship2.png"]
    i = 0
    while i < 2:
      # Загрузка изображения корабля и получение прямоугольника
      self.image = pygame.image.load(SHIPS[i])
      i += 1
      #self.image = pygame.image.load("images/ship.png")
      self.rect = self.image.get_rect()
      self.screen_rect = screen.get_rect()
      # Каждый новый корабль появляется у нижнего края экрана
      self.rect.centerx = self.screen_rect.centerx
      self.rect.bottom = self.screen_rect.bottom
      
  def blitme(self):
    """Рисует корабль в текущей позиции"""
    self.screen.blit(self.image, self.rect)

I wanted to do it in the 2nd file through an array, where the file names are inserted into While - < 2. I thought that I would have such a simple animation, but I don’t see it, because the file at once 2nd for an eye is shown. Is there anything else I need to do with the blitme() function? Maybe here somehow again in a cycle, how to do it in the first function?