用Python语言编写显示敌机并发射子弹。完成后相关代码如下：
import pygame
from pygame.locals import *
import time
import random

class HeroPlane:

def __init__(self, scree):
    self.x = 190
    self.y = 576
    self.scree = scree
    self.image = pygame.image.load("./feiji/hero1.png")
    self.bullet_list = []

def display(self):
    self.scree.blit(self.image, (self.x, self.y))

    for bullet in self.bullet_list:
        bullet.display()
        bullet.move()

        if bullet.judge():
            self.bullet_list.remove(bullet)

def move_left(self):
    self.x -= 5

def move_right(self):
    self.x += 5

def fire(self):
    self.bullet_list.append(Bullet(self.scree, self.x, self.y))

class Bullet:

def __init__(self, scree,x ,y):
    self.x = x + 40
    self.y = y - 22
    self.scree = scree
    self.image = pygame.image.load("./feiji/bullet.png")

def display(self):
    self.scree.blit(self.image, (self.x, self.y))

def move(self):
    self.y -= 20

def judge(self):
    if self.y < 0:
        return True
    else:
        return False

敌机类：

class EnemyPlane:

def __init__(self, scree):
    self.x = 0
    self.y = 0
    self.scree = scree
    self.image = pygame.image.load("./feiji/enemy0.png")
    # 表示敌机发射出的子弹
    self.bullet_list = []  # 存储敌机发射出的子弹，用于判断是否击中敌机
    self.direction = "right"  # 该属性，用于控制敌机的方法

# 用于显示飞机
def display(self):
    self.scree.blit(self.image, (self.x, self.y))  # 显示敌机

    for bullet in self.bullet_list:
        bullet.display()
        bullet.move()
        # 判断子弹是否超过了边界，
        if bullet.judge():
            self.bullet_list.remove(bullet)

# 敌机移动
def move(self):
    if self.direction == "right":
        self.x += 5
    elif self.direction == "left":
        self.x -= 5

    if self.x >= 480 -50:
        self.direction = "left"
    if self.x <= 0:
        self.direction = "right"


# 敌机机发射子弹
def fire(self):
    # 产生一个随机数：
    ran_num = random.randint(1,100)
    if ran_num == 50 or ran_num == 30:
        self.bullet_list.append(EnemyBullet(self.scree, self.x, self.y))

创建敌机的子弹

class EnemyBullet:

def __init__(self, scree,x ,y):
    self.x = x + 25
    self.y = y + 40
    self.scree = scree
    self.image = pygame.image.load("./feiji/bullet1.png")

# 用于显示子弹
def display(self):
    self.scree.blit(self.image, (self.x, self.y))

# 子弹向下移动
def move(self):
    self.y += 20

# 判断子弹的 y值，是否超越边界
def judge(self):
    if self.y > 700:
        return True
    else:
        return False

def key_control(hero):

# 获取事件，比如按键等
for event in pygame.event.get():

    # 判断是否是点击了退出按钮
    if event.type == QUIT:
        print("exit")
        exit()
    # 判断是否是按下了键
    elif event.type == KEYDOWN:
        # 检测按键是否是a或者left
        if event.key == K_a or event.key == K_LEFT:
            print('left')
            hero.move_left()

        # 检测按键是否是d或者right
        elif event.key == K_d or event.key == K_RIGHT:
            print('right')
            hero.move_right()

        # 检测按键是否是空格键
        elif event.key == K_SPACE:
            print('space')
            hero.fire()  # 我机开火

def main():

# 1.创建一个窗口，用来显示内容,窗口宽480，高852
scree = pygame.display.set_mode((480, 700), 0, 32)

# 2.创建一个和窗口大小的图片，用来当背景图
background = pygame.image.load("./feiji/background.png")
# 创建我机
hero = HeroPlane(scree)
# 创建敌机
enemy = EnemyPlane(scree)
# 3.把背景图放到窗口中显示
while True:
    # 设定需要显示的背景图
    scree.blit(background, (0, 0))  # 背景图的左上角，和窗口左上角重合
    # 显示我机
    hero.display()
    enemy.display()  # 显示敌机
    enemy.move()  # 敌机移动
    enemy.fire()  # 敌机发射子弹
    key_control(hero)

    # 更新需要显示的内容
    pygame.display.update()

    time.sleep(0.05)

if name == 'main':
main()