My code does not work as expected (pygame)

[rohes_kaugummi]

Hello,
I am trying to make a game in pygame and after i optimised my code it stopped working.
It is creating a window but it is black .

Thank you for helping.

Here is my code:

import pygame
import sys
from pygame.constants import K_RIGHT

pygame.init()

screen_width = 800
screen_hight = 600

game_window = pygame.display.set_mode((screen_width, screen_hight))
pygame.display.set_caption("Window")

walkleft = (pygame.image.load("D:\python project\pygametest\idle.png"))
walkright = (pygame.image.load("D:\python project\pygametest\idleflip.png"))
idle = (pygame.image.load("D:\python project\pygametest\eidle.png"))
bg = (pygame.image.load("D:\python project\pygametest\ibg.png"))

clock = pygame.time.Clock()

class player (object):
    def __init__(self, x, y, screen_width, screen_hight):
        self.x=x
        self.y=y
        self.screen_width=screen_width
        self.screen_hight=screen_hight
        self.vel=5
        self.is_jump=False
        self.jumpcount=10
        self.left=False
        self.right=False
        self.walkcount=0

    def draw(self,game_window):
        if self.walkcount +1 >= 27:
            self.walkcount = 0
        
        if self.left:
            game_window.blit(walkleft,(self.x,self.y))
            self.walkcount += 1
        elif self.right:
            self.game_window.blit(walkright,(self.x,self.y))
            self.walkcount += 1
        else:
            game_window.blit(idle, (self.x,self.y))

def redrawwindow():
    global walkcount
    man.draw
    pygame.display.update()
    
#mainloop

man=player(300 ,400,64,64)

game_running = True

while game_running:
    clock.tick(27)
    
    pygame.display.update()
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            game_running = False

    keys = pygame.key.get_pressed()

    if keys[pygame.K_LEFT] and man.x > man.vel:
            man.x -= man.vel
            man.right = False
            man.left = True
    elif keys[pygame.K_RIGHT] and man.x < man.screen_width - man.vel:
            man.x += man.vel
            man.right = True
            man.left = False
    else:
        man.right = False
        man.left = False
        man.walkcount = 0

    if not (man.is_jump):
        if keys[pygame.K_SPACE]:
            man.is_jump = True
            man.right = False
            man.left = False
            man.walkcount = 0

    else:
        if man.jumpcount >= -10:
            neg = 1
            if man.jumpcount < 0:
                neg = -1
            man.y -=(man.jumpcount ** 2) / 4 * neg
            man.jumpcount -= 1

        else:
            man.is_jump= False
            man.jumpcount = 10

    redrawwindow()





pygame.quit()
sys.exit()