在蟒蛇速成课程外星人入侵中，船不会停止向左移动

Question

我正在 python 速成课程中练习 python，我正在做第一个项目，即外星人入侵。 我仍然处于它的开始部分，您开始从左到右移动船，并且在 keydown 和 keyup 上它工作正常。对于左键，它只是一直向左移动，不会停止移动。我已经完全按照书中所说的写了，我在这里和谷歌上看了看是否有其他人也有这个错误，但似乎找不到任何可以帮助我的东西。

外星人入侵.py

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

def run_game():
  # Initialize game and create a screen object.
  pygame.init()
  ai_settings = Settings()
  screen = pygame.display.set_mode(
    (ai_settings.screen_width, ai_settings.screen_height))
  pygame.display.set_caption("Alien Invasion")


 # Make a ship
 ship = Ship(screen)
 
 # Start the main loop for the game.
 while True:
    gf.check_events(ship)
    ship.update()
    gf.update_screen(ai_settings, screen, ship)
   
   
run_game()

game_functions.py

 import sys
 import pygame


 def check_events(ship):
    """Respond to keypresses and mouse events"""
    for event in pygame.event.get():
       if event.type == pygame.QUIT:
           sys.exit()
       elif event.type == pygame.KEYDOWN:
           if event.key == pygame.K_RIGHT:
             ship.moving_right = True
           elif event.key == pygame.K_LEFT:
              ship.moving_left = True
       elif event.type == pygame.KEYUP:
           if event.key == pygame.K_RIGHT:
             ship.moving_right = False
           elif event.key == pygame.K_LEFT:
             ship.moving_left == False

 def update_screen(ai_settings, screen, ship):
   """Update images on the screen and flip to the new screen."""
   # Redraw the screen during each pass through the loop.
   screen.fill(ai_settings.bg_color)
   ship.blitme()
            
   # make the most recently drawn screen visible.
   pygame.display.flip()

ship.py 导入pygame

class Ship():
  def __init__(self, screen):
     """Initialize the ship and set its starting position."""
     self.screen = screen
    
     # Load the ship image and get its rect.
     self.image = pygame.image.load('img/ship.bmp')
     self.rect = self.image.get_rect()
     self.screen_rect = screen.get_rect()
    
     # Start each new ship at the bottom center of the screen.
     self.rect.centerx = self.screen_rect.centerx
     self.rect.bottom = self.screen_rect.bottom
    
     # Movement flags
     self.moving_right = False
     self.moving_left = False
    
  def update(self):
     """Update the ships's position based on the movement flag"""
     if self.moving_right:
         self.rect.centerx += 1
     if self.moving_left:
        self.rect.centerx -= 1
    
 def blitme(self):
     """Draw the ship at its current location"""
     self.screen.blit(self.image, self.rect)
    

Answer 1

在check_events

ship.moving_left = False

ship.moving_left == False 将检查真假。