用Python语言编写飞机大战，主要编写发射子弹。完成后相关代码如下：
import pygame
from pygame.locals import *
import time

class HeroPlane:

def __init__(self, scree):
    self.x = 190
    self.y = 576
    self.scree = scree
    self.image = pygame.image.load("./feiji/hero1.png")
    # 表示我机发射出的子弹
    self.bullet_list = []  # 存储我机发射出的子弹，用于判断是否击中敌机

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

    # 用于显示子弹
    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)

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

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

# 我机发射子弹
def fire(self):
    self.bullet_list.append(Bullet(self.scree, self.x, self.y))

创建我机的子弹

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")

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

# 子弹向上移动
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 < 0:
        return True
    else:
        return False

def key_control(hero):
for event in pygame.event.get():

    if event.type == QUIT:
        print("exit")
        exit()

    elif event.type == KEYDOWN:
        if event.key == K_a or event.key == K_LEFT:
            print('left')
            hero.move_left()

        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():
scree = pygame.display.set_mode((480, 700), 0, 32)

background = pygame.image.load("./feiji/background.png")
hero = HeroPlane(scree)

while True:
    scree.blit(background, (0, 0))
    # 显示我机
    hero.display()
    key_control(hero)

    pygame.display.update()
    time.sleep(0.05)

if name == 'main':
main()