python - PyGame press two buttons at the same time

Question

I wrote this:

import pygame

finish = False
while not finish:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            finish = True
    if event.type == pygame.KEYDOWN:
        if event.key == pygame.K_UP:
            print "A"
        if event.key == pygame.K_RIGHT:
            print "B"
        if event.key == pygame.K_LEFT:
            print "C"

Why can't I press two buttons at the same time?

Answer 1

The keyboard events (e.g. pygame.KEYDOWN) occure only once when a button is pressed.
Use pygame.key.get_pressed() to continuously evaluate the states of the buttons. e.g.:

finish = False
while not finish:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            finish = True

    keys = pygame.key.get_pressed()
    if keys[pygame.K_UP]:
        print "A"
    if keys[pygame.K_RIGHT]:
        print "B"
    if keys[pygame.K_LEFT]:
        print "C"

Or if you would rather get a list:

finish = False
while not finish:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            finish = True

    keys = pygame.key.get_pressed()
    if any(keys):
        kmap = {pygame.K_UP : "A", pygame.K_RIGHT : "B", pygame.K_LEFT : "C"}
        sl = [kmap[key] for key in kmap if keys[key]]
        print sl