Question

How would i add key commands to the sprite plumbers? Below is my attempt so far but there is no outcome when pressing the up button. How would i set ud, and ld to change by 10 when button up button is pressed?

pink = (255, 64, 64)
w = 640
h = 480
ld = 0
ud = 0
screen = pygame.display.set_mode((w, h))
running = 1
def key_event(self, event):

         if event.key == pygame.K_UP:
             ud - 10
             ld  + 10
def show_sprites():
    screen.blit(plumbers,(50+ld ,100+ud ))
def setup_background():
    screen.fill((pink))
    screen.blit(cloud_background,(0,0))
    brick_width, brick_height = brick_tile.get_width(), brick_tile.get_height()
    for x,y in itertools.product(range(0,640,brick_width),
                                 range(390,480,brick_height)):
        screen.blit(brick_tile, (x,y))

 while running:

    setup_background()
    event = pygame.event.poll()
    show_sprites()
    pygame.display.flip()

  if event.type == pygame.QUIT:
        sys.exit()
    for event in pygame.event.get():
         if event.type == pygame.QUIT:
             running = False
         elif event.type == pygame.KEYDOWN:
             w.key_event(event)

Answer 1

Delete the lines

event = pygame.event.poll()

and the first occurence of

if event.type == pygame.QUIT:
    sys.exit()

The problem is that both poll and get take events off the event queue so you are losing the key up events in the call to poll.

In other words what happens is:

1. You press the UP key
2. This inserts the KEYDOWN event into the queue
3. you call event = pygame.event.poll()
4. this returns the KEYDOWN event
5. you check to see if this is QUIT, it is not so you continue
6. you call pygame.event.get(), but the queue is now empty so the for loop does not get entered

Example code:

import pygame
pink = (255, 64, 64)
w = 640
h = 480
ud = 0
ld = 0
screen = pygame.display.set_mode((w, h))
running = 1
def key_event(event):
    global ud
    if event.key == pygame.K_UP:
        ud -= 10
        print 'ud',ud           

def setup_background():
    screen.fill((pink))

while running:

    setup_background()
    pygame.display.flip()

    for event in pygame.event.get():
        if event.type == pygame.QUIT:
             running = False
        elif event.type == pygame.KEYDOWN:
             key_event(event)