Why isn't 'type' attribute working with event object in Python

Question

I am a newbie to pygame so when I type the below code in, it shows that there is no such thing as a 'type' attribute for the event object. Can you please tell me what's the error.

# Importing libraries and other stuff
import pygame
from pygame.locals import *

# defining the funtion for drawing the block
def draw_block():
   surface.fill((232,127,7))
   surface.blit(block,(block_x,block_y))
   pygame.display.flip()

if __name__ == "__main__":
   pygame.init()
   surface = pygame.display.set_mode((500,500))
   surface.fill((232,127,7))

   block = pygame.image.load("block_better_3.jpg").convert()
   block_x = 100
   block_y = 100
   surface.blit(block,(block_x,block_y))

   pygame.display.flip()

# Making the window run until user input
running = True
while running:
   for event in pygame.event.get():
        if event.type == K_ESCAPE:
            running = False
        elif event.type == QUIT:
            running = False

        elif event.key == K_UP:
            block_y -= 10
        elif event.key == K_DOWN:
            block_y += 10
        elif event.key == K_LEFT:
            block_x -= 10
        elif event.key == K_RIGHT:
            block_x +=10

Rabbid76 · Answer 1 · 2021-08-08T07:33:52.070

If you want to know when a key is pressed, you need to verify that the event type (event.type) is KEYDOWN and the key attribute of the event object (event.key) is the specific key (K_ESCAPE, K_UP, ...):

running = True
while running:
   for event in pygame.event.get():
        
        if event.type == QUIT:
            running = False
        
        elif event.type == KEYDOWN:
            if event.key == K_ESCAPE:
                running = False
            elif event.key == K_UP:
                block_y -= 10
            elif event.key == K_DOWN:
                block_y += 10
            elif event.key == K_LEFT:
                block_x -= 10
            elif event.key == K_RIGHT:
                block_x += 10

See also pygame.event module and pygame.key module.

The keyboard events (see pygame.event module) occur only once when the state of a key changes. The KEYDOWN event occurs once every time a key is pressed. KEYUP occurs once every time a key is released. Use the keyboard events for a single action or a step-by-step movement.

If you want to achieve a continuously movement, you have to use pygame.key.get_pressed(). pygame.key.get_pressed() returns a list with the state of each key. If a key is held down, the state for the key is True, otherwise False. Use pygame.key.get_pressed() to evaluate the current state of a button and get continuous movement:

running = True
while running:
   for event in pygame.event.get():
        
        if event.type == QUIT:
            running = False
        
        elif event.type == KEYDOWN:
            if event.key == K_ESCAPE:
                running = False

    keys = pygame.key.get_pressed()
    if keys[K_UP]:
        block_y -= 1
    if keys[K_DOWN]:
        block_y += 1
    if keys[K_LEFT]:
        block_x -= 1
    if keys[K_RIGHT]:
        block_x += 1

Further more you need to redraw the scene in every frame:

# Importing libraries and other stuff
import pygame
from pygame.locals import *

# defining the funtion for drawing the block
def draw_block():
    surface.fill((232, 127, 7))
    surface.blit(block,(block_x, block_y))
    pygame.display.flip()

if __name__ == "__main__":
    pygame.init()
    surface = pygame.display.set_mode((500,500))
    clock = pygame.time.Clock()
    block = pygame.image.load("block_better_3.jpg").convert()
    block_x = 100
    block_y = 100
   
    # application loop
    running = True
    while running:

        # limit the frames per second
        clock.tick(100)
        
        # handle the events
        for event in pygame.event.get():
            if event.type == QUIT:
                running = False
            elif event.type == KEYDOWN:
                if event.key == K_ESCAPE:
                    running = False

        # update the game states and positions of objects
        keys = pygame.key.get_pressed()
        block_x += (keys[K_RIGHT] - keys[K_LEFT]) * 2
        block_y += (keys[K_DOWN] - keys[K_UP]) * 2

        # clear the display; draw the scene; update the display 
        draw_block()

    pygame.quit()

The typical PyGame application loop has to:

handle the events by calling either pygame.event.pump() or pygame.event.get().
update the game states and positions of objects dependent on the input events and time (respectively frames)
clear the entire display or draw the background
draw the entire scene (blit all the objects)
update the display by calling either pygame.display.update() or pygame.display.flip()
limit the frames per second to limit CPU usage with pygame.time.Clock.tick

Why isn't 'type' attribute working with event object in Python

1 Answers1