Pygame waiting the user to keypress a key

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...