用Python写一个简单的坦克大战游戏实例

坦克大战游戏的Python代码示例：

import pygame
import random

# 初始化 Pygame
pygame.init()

# 定义颜色
WHITE = (255, 255, 255)
RED = (255, 0, 0)
GREEN = (0, 255, 0)
BLUE = (0, 0, 255)

# 屏幕大小和标题
screen_width = 800
screen_height = 600
screen = pygame.display.set_mode((screen_width, screen_height))
pygame.display.set_caption("坦克大战")

# 坦克类
class Tank(pygame.sprite.Sprite):
    def __init__(self, x, y, color):
        pygame.sprite.Sprite.__init__(self)
        self.image = pygame.Surface([40, 40])
        self.image.fill(color)
        self.rect = self.image.get_rect()
        self.rect.x = x
        self.rect.y = y
        self.speed = 3

    def move_up(self):
        self.rect.y -= self.speed

    def move_down(self):
        self.rect.y += self.speed

    def move_left(self):
        self.rect.x -= self.speed

    def move_right(self):
        self.rect.x += self.speed

    d