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pygame.KEYDOWN, pygame.KEYUP은 게임 화면이 활성화된 상태에서 키보드 입력에 따라 발생하는 이벤트입니다. 

# Import a library of functions called 'pygame'

import pygame

# Initialize the game engine

pygame.init()

# Define the colors we will use in RGB format

BLACK= ( 0,  0,  0)

WHITE= (255,255,255)

BLUE = ( 0,  0,255)

GREEN= ( 0,255,  0)

RED  = (255,  0,  0)

# Set the height and width of the screen

size  = [400,300]

screen= pygame.display.set_mode(size)

font= pygame.font.SysFont("consolas",20)

pygame.display.set_caption("Game Title")

#Loop until the user clicks the close button.

done = False

flag = None

clock= pygame.time.Clock()

# print text function

def printText(msg, color='BLACK', pos=(50,50)):

    textSurface     = font.render(msg,True, pygame.Color(color),None)

    textRect        = textSurface.get_rect()

    textRect.topleft= pos

    screen.blit(textSurface, textRect)

while not done:

    # This limits the while loop to a max of 10 times per second.

    # Leave this out and we will use all CPU we can.

    clock.tick(10)

    # Main Event Loop

    for event in pygame.event.get():# User did something

        if event.type == pygame.KEYDOWN:# If user release what he pressed.

            pressed= pygame.key.get_pressed()

            buttons= [pygame.key.name(k) for k,v in enumerate(pressed) if v]

            flag= True

        elif event.type == pygame.KEYUP:# If user press any key.

            flag= False

        elif event.type == pygame.QUIT: # If user clicked close.

            done= True                 

    # All drawing code happens after the for loop and but

    # inside the main while done==False loop.

    # Clear the screen and set the screen background

    screen.fill(WHITE)

    # Print red text if user pressed any key.

    if flag== True:

        printText('you just key down!!','RED')

        printText('--> you pressed any key.','RED', (50,70))

        printText('Pressed Key : ' + buttons[0],'RED', (50,90))

    # Print blue text if user released any key.

    elif flag== False:

        printText('you just key up!!','BLUE')

        printText('--> released what you pressed.','BLUE', (50,70))

    # Print default text if user do nothing.

    else:

        printText('Please press any key.')

    # Go ahead and update the screen with what we've drawn.

    # This MUST happen after all the other drawing commands.

    pygame.display.flip()

# Be IDLE friendly

pygame.quit()