如何使用pygame更改在python上显示的图像的位置

当我运行代码时，图像显示在左上角附近.如何使图像显示在右上角附近？

我有一个问题.我在制造太空入侵者.太空入侵者在左上角产卵.正确旅行...放下...向左行驶..重复漂洗.

我的版本...我想让外星人在他们身边产卵.在右上角产卵...往下走……向左放下……往上走……向左放下……重复冲洗...

我把一切都做好了...但产卵点.我的外星人不想在右上角产卵.它们在左上角不停地产卵.代码运行得很好.舰队行动正常.但外星人不会在我想让它们产卵的地方产卵.有人介意帮我一把吗？

下面是献给外星人的整个文件.我可以调整什么来满足我的需求？

import pygame
from pygame.sprite import Sprite

class Alien(Sprite):
    """A class to represent a single alien in the fleet."""

def __init__(self, ai_game):
    """Initialize the alien and set its starting position."""
    super().__init__()
    self.screen = ai_game.screen
    self.sideways_settings = ai_game.sideways_settings
#   self.screen_rect = ai_game.screen.get_rect()

    # Load the alien image and set its rect attribute.
    self.image = pygame.image.load('images/alien.bmp')
    self.rect = self.image.get_rect()

    # Start each new alien near the top right of the screen.
    self.rect.x = self.rect.height
    self.rect.y = self.rect.width

    # Store the alien's exact vertical position.
    self.y = float(self.rect.y)
    self.x = float(self.rect.x)

def check_edges(self):
    """Return True if alien is at edge of screen."""
    screen_rect = self.screen.get_rect()
    if self.rect.bottom >= screen_rect.bottom or self.rect.top <= 0:
        return True

def update(self):
    """Move the alien up or down."""
    self.y += (self.sideways_settings.alien_speed *
                self.sideways_settings.fleet_direction)
    self.rect.y = self.y

#   def blitme(self):
#       """Draw the ship at its current location."""
#       self.screen.blit(self.image, self.rect)