When I run this, my charactor won't move, i don't get any errors, he just doesn't move. I've been trying to fix this for ages to no avail, heres my code:

import pygame
pygame.init()

class Player:
    def __init__(self, speed, image):
        self.move_speed = speed
        ##self.x = 640/2
        ##self.y = 480/2
        self.speed = [640/2,480/2]
        self.image = pygame.image.load(image)

    def update(self):
        self.x = self.speed[0]
        self.y = self.speed[1]

    def walk_left(self):
        self.speed[0] -= self.move_speed

    def walk_right(self):
        self.speed[0] += self.move_speed

    def walk_up(self):
        self.speed[1] += self.move_speed

    def walk_down(self):
        self.speed[1] -= self.move_speed
    

def main():
    clock = pygame.time.Clock()
    p = Player(2, "rifleman_blu.png")
    screen = pygame.display.set_mode((640,480))
    while True:
        clock.tick(60)
        p.update()
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                pygame.quit()
                return
            elif event.type == pygame.K_LEFT:
                p.walk_left()
            elif event.type == pygame.K_RIGHT:
                p.walk_right()
            elif event.type == pygame.K_UP:
                p.walk_up()
            elif event.type == pygame.K_DOWN:
                p.walk_down()

        screen.blit(p.image, (p.speed[0], p.speed[1]))
        pygame.display.flip()

if __name__ == '__main__': main()

Any help would be greatly appreciated, thanks in advance!

You should check the type first, and if it is a keyboard event, than get the key pressed.

while True:
        clock.tick(60)
        p.update()
        for event in pygame.event.get():
            if  event.type == pygame.KEYDOWN:
                if event.key == pygame.K_q:
                    pygame.quit()
                    return
                elif event.key == pygame.K_LEFT:
                    p.walk_left()
                elif event.key == pygame.K_RIGHT:
                    p.walk_right()
                elif event.key == pygame.K_UP:
                    p.walk_up()
                elif event.key == pygame.K_DOWN:
                    p.walk_down()

Maybe reading a tutorial is helpful. I have never written a pygame game, all my answers come from googling pygame tutorial and getting the code from there.
For example, the problem in this thread is solved here.

I've been looking through this website for ages and I can't seem to find the answer :(

Maybe I do not see your problem clearly.

I thought the problem was, that your blue riflemen does not move.
In my previous post, I showed you how you can move it.

I took this answer from the website I mentioned, and tested on my system. On this website the first program "bounce.py" contains the code:

events = pygame.event.get( )
        for e in events:
            if( e.type == QUIT ):
                done = True
                break
            elif (e.type == KEYDOWN):
                if( e.key == K_ESCAPE ):
                    done = True
                    break
                if( e.key == K_f ):
                    pygame.display.toggle_fullscreen()

I think it is clear from that code, that the main loop looks at the event type, and if this is a keyboard event, then checks, which key is pressed.
Your code, however checks the type of the event, and checks if this type equals a key code. This is a mismatch, but causes no errors, because both type and key is defined as integer.

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