importエラーを解決したい

前提・実現したいこと

importエラーを解決したい

発生している問題・エラーメッセージ

higashiakonoMBP:pyxel_me higashirinako$ python3 invador.py
Traceback (most recent call last):
  File "/Users/higashirinako/Downloads/pyxel_me/invador.py", line 2, in <module>
    from pyxel import mixer
ImportError: cannot import name 'mixer' from 'pyxel' (unknown location)
higashiakonoMBP:pyxel_me higashirinako$

該当のソースコード

python
1import pyxel
2from pyxel import mixer
3import random
4import math
5
6pyxel.init()
7
8screen = pyxel.display.set_mode((800, 600))
9screen.fill((150,150,150))
10pyxel.display.set_caption('Invaders game')
11
12#Player
13playerimg = pyxel.image.load('player.png')
14playerX,playerY = 370, 480
15playerX_change = 0
16
17#mixer.Sound('laser.wav').play()
18
19#Enemy
20enemyImg = pyxel.image.load('enemy.png')
21enemyX = random.randint(0, 736)
22enemyY = random.randint(50, 150)
23enemyX_change, enemyY_change = 4, 40
24
25#Bullet
26bulletImg = pyxel.image.load('bullet.png')
27bulletX, bulletY = 0, 480
28bulletX_change, bulletY_change = 0, 3
29bullet_state = 'ready'
30
31
32
33#Score
34score_value = 0
35
36def player(x, y):
37    screen.blit(playerImg, (x, y))
38
39def enemy(x, y):
40    screen.blit(enemyImg, (x, y))
41    
42def fire_bullet(x, y):
43    global bullet_state
44    bullet_state = 'fire'
45    screen.blit(bulletImg, (x + 16, y + 10))
46    
47def isCollision(enemyX, enemyY, bulletX, bulletY):
48    distance = math.sqrt(math.pow(enemyX - bulletX, 2) + math.pow(enemyY - bulletY, 2))
49    if distance < 27:
50        return true
51    else:
52        return False
53
54running = True
55while running: 
56    screen.fill((0, 0, 0))
57      #font = pyxel.font.SysFont(None, 80)
58      #message = font.render('Hello World', False, (255, 255, 255))
59      #screen.blit(message, (20,50))
60    for event in pyxel.event.get():
61            if event.type == pyxel.QUIT:
62                 running = False
63if event.type == pyxel.KEYDOWN:
64    if event.key == pyxel.K_LEFT:
65        playerX_change = -1.5
66    if event.key == pyxel.K_RIGHT:
67        playerX_change = 1.5
68    if event.key == pyxel.K_SPACE:
69       if bullet_state == 'ready':
70            bulletX = playerX
71            fire_bullet(bulletX, bulletY)
72            
73    if event.type == pyxel.KEYUP:
74            if event.key == pyxel.K_LEFT or event.key == pyxel.K_RIGHT:
75                playerX_change = 0
76   
77    #Player
78    playerX += playerX_change
79    if playerX <= 0:
80         playerX = 0
81    elif playerX >= 736:
82        playerX = 736
83     
84    #Enemy
85    if enemy > 440:
86         pass
87    enemyX += enemyX_change
88    if enemyX <= 0:
89        enemyX_change = 4 #go right if come to the leftend
90        enemyY += enemyY_change
91    elif enemyX >= 736:
92        enemyX_change = -4 #go left if come to the rightend
93        enemyY += enemyY_change
94    
95    collision = isCollision(enemyX, enemyY, bulletX, bulletY)
96    if collosion:
97        bulletY = 480
98        bullet_state = 'ready'
99        score_value += 1
100        enemyX = random.randint(0, 736)
101        enemyY = random.randint(50, 150)
102    
103    #bullet Movement
104    if bulletY <=0:
105        bulletY = 480
106        bullet_state = 'ready'
107        
108    if bullet_state == 'fire':
109        fire_bullet(bulletX, bulletY)
110        bulletY -= bulletY_change
111    
112    
113    
114    #Score
115    font = pyxel.font.SysFont(None, 32) #creating fonts 'None' is default
116    score = font.render("Score: {str(score_value)}", True, (255,255,255))
117    screen.blit(score, (20,50))
118    
119    
120    player(playerX, playerY)
121    enemy(enemyX, enemyY)
122    
123    pyxel.display.update()