Pygame waiting the user to keypress a key

Question

I am searching a method, where the program stops and waiting for a spesific key to be pressed by the user. May I can implement this one with a while loop? I need the best algorithm, if there exist a build-in function of waiting, to avoid the loop. I found several information on the official website of pygame, but nothing help.

Here is a testing algorithms but won't work:

key = "f"
while key != "K_f":
     key = pygame.key.get_pressed()
     if key[Keys.K_f]:
         do something...

Answer 1

If you are waiting for a key to be pressed you can use the event.wait() function. This is useful, because it does not require a-lot of processing.

import pygame
from pygame.locals import *

pygame.event.clear()
while True:
    event = pygame.event.wait()
    if event.type == QUIT:
        pygame.quit()
        sys.exit()
    elif event.type == KEYDOWN:
        if event.key = K_f:
            do something...

Note that event.wait() waits for events to appear in the event cache, the event cache should be cleared first.

pygame.event documentation

Answer 2

You could do it with a while loop and an event queue:

from pygame.locals import *
def wait():
    while True:
        for event in pygame.event.get():
            if event.type == QUIT:
                pygame.quit()
                sys.exit()
            if event.type == KEYDOWN and event.key == K_f:
                return