Pygame Tutorials Part 3 Image Handling

[ElsieB]

Hi, I've recently started the Tutorials and am picking up some great tips. However, I'm getting an error message with the keys event:

Error:
Traceback (most recent call last):
  File "/data/user/0/ru.iiec.pydroid3/files/temp_iiec_codefile.py", line 34, in <module>
    player.update(keys)
                  ^^^^

NameError: name 'keys' is not defined

Can you advise how I fix this?

Full code:

import pygame as pg
   
pg.init()
   
class Player:
    def __init__(self, screen_rect):
        self.image = pg.image.load('spaceship.png').convert()
        self.image.set_colorkey((255,0,255))
        self.transformed_image = pg.transform.rotate(self.image, 180)
        self.rect = self.image.get_rect(center=screen_rect.center)
        self.speed = 5
          
    def update(self, keys):
        if keys[pg.K_LEFT]:
            self.rect.x -= self.speed
        elif keys[pg.K_RIGHT]:
            self.rect.x += self.speed
           
    def draw(self, surf):
        surf.blit(self.transformed_image, self.rect)
   
screen = pg.display.set_mode((800,600))
screen_rect = screen.get_rect()
player = Player(screen_rect)
clock = pg.time.Clock()
done = False
while not done:
    screen.fill((0,0,0))
    keys = pg.key.get_pressed()
    for event in pg.event.get(): 
        if event.type == pg.QUIT:
            done = True
    player.update(keys)
    player.draw(screen)
    pg.display.update()
    clock.tick(60)

Thanks and sorry if I've done anything wrong in this post.

Larz60+ write Apr-07-2025, 08:17 AM:
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[ElsieB]

Thanks Larz60 for doing that for me.

The full Traceback error was:

Error:
 Traceback (most recent call last):
  File "/data/user/0/ru.iiec.pydroid3/files/temp_iiec_codefile.py", line 34, in <module>
    player.update(keys)
                  ^^^^
NameError: name 'keys' is not defined  

As I've recently started the tutorial this is the only error (so far!). No doubt I'll get more as I progress.

[Larz60+]

put a print statement after:

keys = pg.key.get_pressed()
print(f'keys: {keys}')

is keys populated?

[ElsieB]

Thanks again Larz60+

Error message has gone.