Why is is not working

kn=knight(100,100,40,50,2)

import pygame
# how to do img /img/hero/knight 3 idle.png ex for me
pygame.init()

clock=pygame.time.Clock()
fps=60
#pygame widow
bottom_panel=100
screen_width=800
screem_height=400+bottom_panel
screen = pygame.display.set_mode((screen_width, screem_height))
pygame.display.set_caption('Hero World Battle')


#load images

#back ground image
background_img=pygame.image.load('something.png')
panel_img=pygame.image.load('pixil-frame-0(1).png')
#function for background
def draw_bg():
    clock.tick(fps)
    screen.blit(background_img, (0,0))
def draw_panel():
    screen.blit(panel_img, (-110,255))

class knight():
    def __init__(self,x,y,max_hp,power,potions):

        self.max_hp=max_hp
        self.hp=max_hp
        self.power=power
        self.start_potions=potions
        self.alive=True
        self.image=pygame.image.load('/img/Hero Knight/Sprites/HeroKnight/Idle/HeroKnight_Idle_0.png')
        self.rect=self.image.get_rect()
        self.rect.center(x,y)



    def draw(self):
        screen.blit(self.image,self.rect)


kn=knight(100,100,40,50,2)
run=True
while run:
  clock.tick(fps)

   #draw background
  draw_bg()
  draw_panel()
  for event in pygame.event.get():
       if event.type == pygame.QUIT:
           run=False
           print(run)
  pygame.display.update()

pygame.quit()