2、開啟main.py檔案，寫入程式碼。

# main.py
import pygame
import sys
import traceback
import myplane
import enemy
import bullet
import supply

from pygame.locals import *
from random import *

pygame.init()
pygame.mixer.init()

bg_size = width, height = 480, 700
screen = pygame.display.set_mode(bg_size)
pygame.display
 
.set_caption("飛機大戰")

background = pygame.image.load("images/background.png").convert()

BLACK = (0, 0, 0)
WHITE = (255, 255, 255)
GREEN = (0, 255, 0)
RED = (255, 0, 0)

# 載入遊戲音樂
pygame.mixer.music.load("sound/game_music.ogg")
pygame.mixer.music.set_volume(0.2)
bullet_sound = pygame.mixer.Sound("sound/bullet.wav"
 
)
bullet_sound.set_volume(0.2)
bomb_sound = pygame.mixer.Sound("sound/use_bomb.wav")
bomb_sound.set_volume(0.2)
supply_sound = pygame.mixer.Sound("sound/supply.wav")
supply_sound.set_volume(0.2)
get_bomb_sound = pygame.mixer.Sound("sound/get_bomb.wav")
get_bomb_sound.set_volume(0.2)
get_bullet_sound = pygame.mixer
 
.Sound("sound/get_bullet.wav")
get_bullet_sound.set_volume(0.2)
upgrade_sound = pygame.mixer.Sound("sound/upgrade.wav")
upgrade_sound.set_volume(0.2)
enemy3_fly_sound = pygame.mixer.Sound("sound/enemy3_flying.wav")
enemy3_fly_sound.set_volume(0.2)
enemy1_down_sound = pygame.mixer.Sound("sound/enemy1_down.wav")
enemy1_down_sound.set_volume(0.2)
enemy2_down_sound = pygame.mixer.Sound("sound/enemy2_down.wav")
enemy2_down_sound.set_volume(0.2)
enemy3_down_sound = pygame.mixer.Sound("sound/enemy3_down.wav")
enemy3_down_sound.set_volume(0.5)
me_down_sound = pygame.mixer.Sound("sound/me_down.wav")
me_down_sound.set_volume(0.2)


def add_small_enemies(group1, group2, num):
    for i in range(num):
        e1 = enemy.SmallEnemy(bg_size)
        group1.add(e1)
        group2.add(e1)

def add_mid_enemies(group1, group2, num):
    for i in range(num):
        e2 = enemy.MidEnemy(bg_size)
        group1.add(e2)
        group2.add(e2)

def add_big_enemies(group1, group2, num):
    for i in range(num):
        e3 = enemy.BigEnemy(bg_size)
        group1.add(e3)
        group2.add(e3)

def inc_speed(target, inc):
    for each in target:
        each.speed += inc

def main():
    pygame.mixer.music.play(-1)

    # 生成我方飛機
    me = myplane.MyPlane(bg_size)

    enemies = pygame.sprite.Group()

    # 生成敵方小型飛機
    small_enemies = pygame.sprite.Group()
    add_small_enemies(small_enemies, enemies, 15)

    # 生成敵方中型飛機
    mid_enemies = pygame.sprite.Group()
    add_mid_enemies(mid_enemies, enemies, 4)

    # 生成敵方大型飛機
    big_enemies = pygame.sprite.Group()
    add_big_enemies(big_enemies, enemies, 2)

    # 生成普通子彈
    bullet1 = []
    bullet1_index = 0
    BULLET1_NUM = 4
    for i in range(BULLET1_NUM):
        bullet1.append(bullet.Bullet1(me.rect.midtop))

    # 生成超級子彈
    bullet2 = []
    bullet2_index = 0
    BULLET2_NUM = 8
    for i in range(BULLET2_NUM//2):
        bullet2.append(bullet.Bullet2((me.rect.centerx-33, me.rect.centery)))
        bullet2.append(bullet.Bullet2((me.rect.centerx+30, me.rect.centery)))

    clock = pygame.time.Clock()

    # 中彈圖片索引
    e1_destroy_index = 0
    e2_destroy_index = 0
    e3_destroy_index = 0
    me_destroy_index = 0

    # 統計得分
    score = 0
    score_font = pygame.font.Font("font/font.ttf", 36)

    # 標誌是否暫停遊戲
    paused = False
    pause_nor_image = pygame.image.load("images/pause_nor.png").convert_alpha()
    pause_pressed_image = pygame.image.load("images/pause_pressed.png").convert_alpha()
    resume_nor_image = pygame.image.load("images/resume_nor.png").convert_alpha()
    resume_pressed_image = pygame.image.load("images/resume_pressed.png").convert_alpha()
    paused_rect = pause_nor_image.get_rect()
    paused_rect.left, paused_rect.top = width - paused_rect.width - 10, 10
    paused_image = pause_nor_image

    # 設定難度級別
    level = 1

    # 全屏炸彈
    bomb_image = pygame.image.load("images/bomb.png").convert_alpha()
    bomb_rect = bomb_image.get_rect()
    bomb_font = pygame.font.Font("font/font.ttf", 48)
    bomb_num = 3

    # 每30秒發放一個補給包
    bullet_supply = supply.Bullet_Supply(bg_size)
    bomb_supply = supply.Bomb_Supply(bg_size)
    SUPPLY_TIME = USEREVENT
    pygame.time.set_timer(SUPPLY_TIME, 30 * 1000)

    # 超級子彈定時器
    DOUBLE_BULLET_TIME = USEREVENT + 1

    # 標誌是否使用超級子彈
    is_double_bullet = False

    # 解除我方無敵狀態定時器
    INVINCIBLE_TIME = USEREVENT + 2

    # 生命數量
    life_image = pygame.image.load("images/life.png").convert_alpha()
    life_rect = life_image.get_rect()
    life_num = 3

    # 用於阻止重複開啟記錄檔案
    recorded = False

    # 遊戲結束畫面
    gameover_font = pygame.font.Font("font/font.TTF", 48)
    again_image = pygame.image.load("images/again.png").convert_alpha()
    again_rect = again_image.get_rect()
    gameover_image = pygame.image.load("images/gameover.png").convert_alpha()
    gameover_rect = gameover_image.get_rect()

    # 用於切換圖片
    switch_image = True

    # 用於延遲
    delay = 100

    running = True

    while running:
        for event in pygame.event.get():
            if event.type == QUIT:
                pygame.quit()
                sys.exit()

            elif event.type == MOUSEBUTTONDOWN:
                if event.button == 1 and paused_rect.collidepoint(event.pos):
                    paused = not paused
                    if paused:
                        pygame.time.set_timer(SUPPLY_TIME, 0)
                        pygame.mixer.music.pause()
                        pygame.mixer.pause()
                    else:
                        pygame.time.set_timer(SUPPLY_TIME, 30 * 1000)
                        pygame.mixer.music.unpause()
                        pygame.mixer.unpause()

            elif event.type == MOUSEMOTION:
                if paused_rect.collidepoint(event.pos):
                    if paused:
                        paused_image = resume_pressed_image
                    else:
                        paused_image = pause_pressed_image
                else:
                    if paused:
                        paused_image = resume_nor_image
                    else:
                       paused_image = pause_nor_image

            elif event.type == KEYDOWN:
                if event.key == K_SPACE:
                    if bomb_num:
                        bomb_num -= 1
                        bomb_sound.play()
                        for each in enemies:
                            if each.rect.bottom > 0:
                                each.active = False

            elif event.type == SUPPLY_TIME:
                supply_sound.play()
                if choice([True, False]):
                    bomb_supply.reset()
                else:
                    bullet_supply.reset()

            elif event.type == DOUBLE_BULLET_TIME:
                is_double_bullet = False
                pygame.time.set_timer(DOUBLE_BULLET_TIME, 0)

            elif event.type == INVINCIBLE_TIME:
                me.invincible = False
                pygame.time.set_timer(INVINCIBLE_TIME, 0)


        # 根據使用者的得分增加難度
        if level == 1 and score > 50000:
            level = 2
            upgrade_sound.play()
            # 增加3架小型敵機、2架中型敵機和1架大型敵機
            add_small_enemies(small_enemies, enemies, 3)
            add_mid_enemies(mid_enemies, enemies, 2)
            add_big_enemies(big_enemies, enemies, 1)
            # 提升小型敵機的速度
            inc_speed(small_enemies, 1)
        elif level == 2 and score > 300000:
            level = 3
            upgrade_sound.play()
            # 增加5架小型敵機、3架中型敵機和2架大型敵機
            add_small_enemies(small_enemies, enemies, 5)
            add_mid_enemies(mid_enemies, enemies, 3)
            add_big_enemies(big_enemies, enemies, 2)
            # 提升小型敵機的速度
            inc_speed(small_enemies, 1)
            inc_speed(mid_enemies, 1)
        elif level == 3 and score > 600000:
            level = 4
            upgrade_sound.play()
            # 增加5架小型敵機、3架中型敵機和2架大型敵機
            add_small_enemies(small_enemies, enemies, 5)
            add_mid_enemies(mid_enemies, enemies, 3)
            add_big_enemies(big_enemies, enemies, 2)
            # 提升小型敵機的速度
            inc_speed(small_enemies, 1)
            inc_speed(mid_enemies, 1)
        elif level == 4 and score > 1000000:
            level = 5
            upgrade_sound.play()
            # 增加5架小型敵機、3架中型敵機和2架大型敵機
            add_small_enemies(small_enemies, enemies, 5)
            add_mid_enemies(mid_enemies, enemies, 3)
            add_big_enemies(big_enemies, enemies, 2)
            # 提升小型敵機的速度
            inc_speed(small_enemies, 1)
            inc_speed(mid_enemies, 1)


        screen.blit(background, (0, 0))

        if life_num and not paused:
            # 檢測使用者的鍵盤操作
            key_pressed = pygame.key.get_pressed()

            if key_pressed[K_w] or key_pressed[K_UP]:
                me.moveUp()
            if key_pressed[K_s] or key_pressed[K_DOWN]:
                me.moveDown()
            if key_pressed[K_a] or key_pressed[K_LEFT]:
                me.moveLeft()
            if key_pressed[K_d] or key_pressed[K_RIGHT]:
                me.moveRight()

            # 繪製全屏炸彈補給並檢測是否獲得
            if bomb_supply.active:
                bomb_supply.move()
                screen.blit(bomb_supply.image, bomb_supply.rect)
                if pygame.sprite.collide_mask(bomb_supply, me):
                    get_bomb_sound.play()
                    if bomb_num < 3:
                        bomb_num += 1
                    bomb_supply.active = False

            # 繪製超級子彈補給並檢測是否獲得
            if bullet_supply.active:
                bullet_supply.move()
                screen.blit(bullet_supply.image, bullet_supply.rect)
                if pygame.sprite.collide_mask(bullet_supply, me):
                    get_bullet_sound.play()
                    is_double_bullet = True
                    pygame.time.set_timer(DOUBLE_BULLET_TIME, 18 * 1000)
                    bullet_supply.active = False

            # 發射子彈
            if not(delay % 10):
                bullet_sound.play()
                if is_double_bullet:
                    bullets = bullet2
                    bullets[bullet2_index].reset((me.rect.centerx-33, me.rect.centery))
                    bullets[bullet2_index+1].reset((me.rect.centerx+30, me.rect.centery))
                    bullet2_index = (bullet2_index + 2) % BULLET2_NUM
                else:
                    bullets = bullet1
                    bullets[bullet1_index].reset(me.rect.midtop)
                    bullet1_index = (bullet1_index + 1) % BULLET1_NUM


            # 檢測子彈是否擊中敵機
            for b in bullets:
                if b.active:
                    b.move()
                    screen.blit(b.image, b.rect)
                    enemy_hit = pygame.sprite.spritecollide(b, enemies, False, pygame.sprite.collide_mask)
                    if enemy_hit:
                        b.active = False
                        for e in enemy_hit:
                            if e in mid_enemies or e in big_enemies:
                                e.hit = True
                                e.energy -= 1
                                if e.energy == 0:
                                    e.active = False
                            else:
                                e.active = False

            # 繪製大型敵機
            for each in big_enemies:
                if each.active:
                    each.move()
                    if each.hit:
                        screen.blit(each.image_hit, each.rect)
                        each.hit = False
                    else:
                        if switch_image:
                            screen.blit(each.image1, each.rect)
                        else:
                            screen.blit(each.image2, each.rect)

                    # 繪製血槽
                    pygame.draw.line(screen, BLACK, \
                                     (each.rect.left, each.rect.top - 5), \
                                     (each.rect.right, each.rect.top - 5), \
                                     2)
                    # 當生命大於20%顯示綠色，否則顯示紅色
                    energy_remain = each.energy / enemy.BigEnemy.energy
                    if energy_remain > 0.2:
                        energy_color = GREEN
                    else:
                        energy_color = RED
                    pygame.draw.line(screen, energy_color, \
                                     (each.rect.left, each.rect.top - 5), \
                                     (each.rect.left + each.rect.width * energy_remain, \
                                      each.rect.top - 5), 2)

                    # 即將出現在畫面中，播放音效
                    if each.rect.bottom == -50:
                        enemy3_fly_sound.play(-1)
                else:
                    # 毀滅
                    if not(delay % 3):
                        if e3_destroy_index == 0:
                            enemy3_down_sound.play()
                        screen.blit(each.destroy_images[e3_destroy_index], each.rect)
                        e3_destroy_index = (e3_destroy_index + 1) % 6
                        if e3_destroy_index == 0:
                            enemy3_fly_sound.stop()
                            score += 10000
                            each.reset()

            # 繪製中型敵機：
            for each in mid_enemies:
                if each.active:
                    each.move()

                    if each.hit:
                        screen.blit(each.image_hit, each.rect)
                        each.hit = False
                    else:
                        screen.blit(each.image, each.rect)

                    # 繪製血槽
                    pygame.draw.line(screen, BLACK, \
                                     (each.rect.left, each.rect.top - 5), \
                                     (each.rect.right, each.rect.top - 5), \
                                     2)
                    # 當生命大於20%顯示綠色，否則顯示紅色
                    energy_remain = each.energy / enemy.MidEnemy.energy
                    if energy_remain > 0.2:
                        energy_color = GREEN
                    else:
                        energy_color = RED
                    pygame.draw.line(screen, energy_color, \
                                     (each.rect.left, each.rect.top - 5), \
                                     (each.rect.left + each.rect.width * energy_remain, \
                                      each.rect.top - 5), 2)
                else:
                    # 毀滅
                    if not(delay % 3):
                        if e2_destroy_index == 0:
                            enemy2_down_sound.play()
                        screen.blit(each.destroy_images[e2_destroy_index], each.rect)
                        e2_destroy_index = (e2_destroy_index + 1) % 4
                        if e2_destroy_index == 0:
                            score += 6000
                            each.reset()

            # 繪製小型敵機：
            for each in small_enemies:
                if each.active:
                    each.move()
                    screen.blit(each.image, each.rect)
                else:
                    # 毀滅
                    if not(delay % 3):
                        if e1_destroy_index == 0:
                            enemy1_down_sound.play()
                        screen.blit(each.destroy_images[e1_destroy_index], each.rect)
                        e1_destroy_index = (e1_destroy_index + 1) % 4
                        if e1_destroy_index == 0:
                            score += 1000
                            each.reset()

            # 檢測我方飛機是否被撞
            enemies_down = pygame.sprite.spritecollide(me, enemies, False, pygame.sprite.collide_mask)
            if enemies_down and not me.invincible:
                me.active = False
                for e in enemies_down:
                    e.active = False

            # 繪製我方飛機
            if me.active:
                if switch_image:
                    screen.blit(me.image1, me.rect)
                else:
                    screen.blit(me.image2, me.rect)
            else:
                # 毀滅
                if not(delay % 3):
                    if me_destroy_index == 0:
                        me_down_sound.play()
                    screen.blit(me.destroy_images[me_destroy_index], me.rect)
                    me_destroy_index = (me_destroy_index + 1) % 4
                    if me_destroy_index == 0:
                        life_num -= 1
                        me.reset()
                        pygame.time.set_timer(INVINCIBLE_TIME, 3 * 1000)

            # 繪製全屏炸彈數量
            bomb_text = bomb_font.render("× %d" % bomb_num, True, WHITE)
            text_rect = bomb_text.get_rect()
            screen.blit(bomb_image, (10, height - 10 - bomb_rect.height))
            screen.blit(bomb_text, (20 + bomb_rect.width, height - 5 - text_rect.height))

            # 繪製剩餘生命數量
            if life_num:
                for i in range(life_num):
                    screen.blit(life_image, \
                                (width-10-(i+1)*life_rect.width, \
                                 height-10-life_rect.height))

            # 繪製得分
            score_text = score_font.render("Score : %s" % str(score), True, WHITE)
            screen.blit(score_text, (10, 5))

        # 繪製遊戲結束畫面
        elif life_num == 0:
            # 背景音樂停止
            pygame.mixer.music.stop()

            # 停止全部音效
            pygame.mixer.stop()

            # 停止發放補給
            pygame.time.set_timer(SUPPLY_TIME, 0)

            if not recorded:
                recorded = True
                # 讀取歷史最高得分
                with open("record.txt", "r") as f:
                    record_score = int(f.read())

                # 如果玩家得分高於歷史最高得分，則存檔
                if score > record_score:
                    with open("record.txt", "w") as f:
                        f.write(str(score))

            # 繪製結束畫面
            record_score_text = score_font.render("Best : %d" % record_score, True, (255, 255, 255))
            screen.blit(record_score_text, (50, 50))

            gameover_text1 = gameover_font.render("Your Score", True, (255, 255, 255))
            gameover_text1_rect = gameover_text1.get_rect()
            gameover_text1_rect.left, gameover_text1_rect.top = \
                                 (width - gameover_text1_rect.width) // 2, height // 3
            screen.blit(gameover_text1, gameover_text1_rect)

            gameover_text2 = gameover_font.render(str(score), True, (255, 255, 255))
            gameover_text2_rect = gameover_text2.get_rect()
            gameover_text2_rect.left, gameover_text2_rect.top = \
                                 (width - gameover_text2_rect.width) // 2, \
                                 gameover_text1_rect.bottom + 10
            screen.blit(gameover_text2, gameover_text2_rect)

            again_rect.left, again_rect.top = \
                             (width - again_rect.width) // 2, \
                             gameover_text2_rect.bottom + 50
            screen.blit(again_image, again_rect)

            gameover_rect.left, gameover_rect.top = \
                                (width - again_rect.width) // 2, \
                                again_rect.bottom + 10
            screen.blit(gameover_image, gameover_rect)

            # 檢測使用者的滑鼠操作
            # 如果使用者按下滑鼠左鍵
            if pygame.mouse.get_pressed()[0]:
                # 獲取滑鼠座標
                pos = pygame.mouse.get_pos()
                # 如果使用者點選“重新開始”
                if again_rect.left < pos[0] < again_rect.right and \
                   again_rect.top < pos[1] < again_rect.bottom:
                    # 呼叫main函式，重新開始遊戲
                    main()
                # 如果使用者點選“結束遊戲”            
                elif gameover_rect.left < pos[0] < gameover_rect.right and \
                     gameover_rect.top < pos[1] < gameover_rect.bottom:
                    # 退出遊戲
                    pygame.quit()
                    sys.exit()      

        # 繪製暫停按鈕
        screen.blit(paused_image, paused_rect)

        # 切換圖片
        if not(delay % 5):
            switch_image = not switch_image

        delay -= 1
        if not delay:
            delay = 100

        pygame.display.flip()
        clock.tick(60)

if __name__ == "__main__":
    try:
        main()
    except SystemExit:
        pass
    except:
        traceback.print_exc()
        pygame.quit()
        input()

3、myplane.py

import pygame

class MyPlane(pygame.sprite.Sprite):
    def __init__(self, bg_size):
        pygame.sprite.Sprite.__init__(self)

        self.image1 = pygame.image.load("images/me1.png").convert_alpha()
        self.image2 = pygame.image.load("images/me2.png").convert_alpha()
        self.destroy_images = []
        self.destroy_images.extend([\
            pygame.image.load("images/me_destroy_1.png").convert_alpha(), \
            pygame.image.load("images/me_destroy_2.png").convert_alpha(), \
            pygame.image.load("images/me_destroy_3.png").convert_alpha(), \
            pygame.image.load("images/me_destroy_4.png").convert_alpha() \
            ])
        self.rect = self.image1.get_rect()
        self.width, self.height = bg_size[0], bg_size[1]
        self.rect.left, self.rect.top = \
                        (self.width - self.rect.width) // 2, \
                        self.height - self.rect.height - 60
        self.speed = 10
        self.active = True
        self.invincible = False
        self.mask = pygame.mask.from_surface(self.image1)

    def moveUp(self):
        if self.rect.top > 0:
            self.rect.top -= self.speed
        else:
            self.rect.top = 0

    def moveDown(self):
        if self.rect.bottom < self.height - 60:
            self.rect.top += self.speed
        else:
            self.rect.bottom = self.height - 60

    def moveLeft(self):
        if self.rect.left > 0:
            self.rect.left -= self.speed
        else:
            self.rect.left = 0

    def moveRight(self):
        if self.rect.right < self.width:
            self.rect.left += self.speed
        else:
            self.rect.right = self.width

    def reset(self):
        self.rect.left, self.rect.top = \
                        (self.width - self.rect.width) // 2, \
                        self.height - self.rect.height - 60
        self.active = True
        self.invincible = True

4、enemy.py

import pygame
from random import *

class SmallEnemy(pygame.sprite.Sprite):
    def __init__(self, bg_size):
        pygame.sprite.Sprite.__init__(self)

        self.image = pygame.image.load("images/enemy1.png").convert_alpha()
        self.destroy_images = []
        self.destroy_images.extend([\
            pygame.image.load("images/enemy1_down1.png").convert_alpha(), \
            pygame.image.load("images/enemy1_down2.png").convert_alpha(), \
            pygame.image.load("images/enemy1_down3.png").convert_alpha(), \
            pygame.image.load("images/enemy1_down4.png").convert_alpha() \
            ])
        self.rect = self.image.get_rect()
        self.width, self.height = bg_size[0], bg_size[1]
        self.speed = 2
        self.active = True
        self.rect.left, self.rect.top = \
                        randint(0, self.width - self.rect.width), \
                        randint(-5 * self.height, 0)
        self.mask = pygame.mask.from_surface(self.image)

    def move(self):
        if self.rect.top < self.height:
            self.rect.top += self.speed
        else:
            self.reset()

    def reset(self):
        self.active = True
        self.rect.left, self.rect.top = \
                        randint(0, self.width - self.rect.width), \
                        randint(-5 * self.height, 0)


class MidEnemy(pygame.sprite.Sprite):
    energy = 8

    def __init__(self, bg_size):
        pygame.sprite.Sprite.__init__(self)

        self.image = pygame.image.load("images/enemy2.png").convert_alpha()
        self.image_hit = pygame.image.load("images/enemy2_hit.png").convert_alpha()
        self.destroy_images = []
        self.destroy_images.extend([\
            pygame.image.load("images/enemy2_down1.png").convert_alpha(), \
            pygame.image.load("images/enemy2_down2.png").convert_alpha(), \
            pygame.image.load("images/enemy2_down3.png").convert_alpha(), \
            pygame.image.load("images/enemy2_down4.png").convert_alpha() \
            ])
        self.rect = self.image.get_rect()
        self.width, self.height = bg_size[0], bg_size[1]
        self.speed = 1
        self.active = True
        self.rect.left, self.rect.top = \
                        randint(0, self.width - self.rect.width), \
                        randint(-10 * self.height, -self.height)
        self.mask = pygame.mask.from_surface(self.image)
        self.energy = MidEnemy.energy
        self.hit = False

    def move(self):
        if self.rect.top < self.height:
            self.rect.top += self.speed
        else:
            self.reset()

    def reset(self):
        self.active = True
        self.energy = MidEnemy.energy
        self.rect.left, self.rect.top = \
                        randint(0, self.width - self.rect.width), \
                        randint(-10 * self.height, -self.height)


class BigEnemy(pygame.sprite.Sprite):
    energy = 20

    def __init__(self, bg_size):
        pygame.sprite.Sprite.__init__(self)

        self.image1 = pygame.image.load("images/enemy3_n1.png").convert