Why isn't my game working????

Question

Here is my code in pygame.
Idk why it doesn't work
help

import pygame

pygame.init()

w = 800
h = 700

screen = pygame.display.set_mode((w, h))
pygame.display.set_caption('Life run')
icon = pygame.image.load(r'/Users/lanik2009/Downloads/icon.PNG')
pygame.display.set_icon(icon)

player_img = pygame.image.load(r'/Users/lanik2009/Downloads/sprite.PNG')
player_img = pygame.transform.scale(player_img, (70, 100))
bg = pygame.image.load(r'/Users/lanik2009/Downloads/bg.PNG')

x = 370
y = 480

screen.blit(bg, (0,0))
screen.blit(player_img, (60, 470))

running = True
while running:

for event in pygame.event.get():
if event.type == pygame.QUIT:
running = False

def update(self):
vel = 0
keys = pygame.key.get_pressed()
if keys[pygame.K_LEFT]:
vel -= 8
if keys[pygame.K_RIGHT]:
vel = 8
if keys[pygame.K_UP]:
vel = 8
x += vel

pygame.display.update()

pygame.quit()

Answer 1

First question, what does the game do?

I see only several wrong code lines. Try to edit them.

def update(x, y):
vel = 0
keys = pygame.key.get_pressed()
if keys[pygame.K_LEFT]:
vel -= 8
if keys[pygame.K_RIGHT]:
vel = 8
if keys[pygame.K_UP]:
vel = 8
x += vel
screen.blit(bg, (0, 0))
screen.blit(player_img, (x, y))
update(x, y)
pygame.display.update()
pygame.quit()