Why is this broken? - Python 3.5

I have made a pong game and I want it so it auto-resizes. I made it so it can be resized but it isn’t resizing the actual game. Please may you help me make it work!

import pygame, ctypes, random, sys
from pygame.locals import *
from sys import exit


pygame.init()

# Set up game basics
icon = pygame.image.load('icon.png')
pygame.display.set_icon(icon)
screen = pygame.display.set_mode((640, 480), pygame.RESIZABLE)
pygame.display.set_caption("Pong Pong!")

while True:

    #Creating 2 bars, a ball and background.
    back = pygame.Surface((640,480))
    background = back.convert()
    background.fill((0,0,0))
    bar = pygame.Surface((10,50))
    bar1 = bar.convert()
    bar1.fill((0,0,255))
    bar2 = bar.convert()
    bar2.fill((255,0,0))
    circ_sur = pygame.Surface((15,15))
    circ = pygame.draw.circle(circ_sur,(0,255,0),(7,7),7)
    circle = circ_sur.convert()
    circle.set_colorkey((255,255,255))

    # some definitions
    bar1_x, bar2_x = 10. , 620.
    bar1_y, bar2_y = 215. , 215.
    circle_x, circle_y = 307.5, 232.5
    bar1_move, bar2_move = 0. , 0.
    speed_x, speed_y, speed_circ = 250., 250., 400
    bar1_score, bar2_score = 0,0
    #clock and font objects
    clock = pygame.time.Clock()
    font = pygame.font.SysFont("Comic Sans MS",40)

    while True:
        
        for event in pygame.event.get():
            if event.type == QUIT:
                sys.exit()
                if event.type == KEYDOWN:
                    if event.key == K_ESCAPE:
                        pygame.quit()
                        sys.exit()
                if event.type == VIDEORESIZE:
                    # The main code that resizes the window:
                    # (recreate the window with the new size)
                    screen = pygame.display.set_mode((event.w, event.h),
                                                  pygame.RESIZABLE)
            if event.type == KEYDOWN:
                if event.key == K_UP:
                    bar1_move = -ai_speed
                elif event.key == K_DOWN:
                    bar1_move = ai_speed
            elif event.type == KEYUP:
                if event.key == K_UP:
                    bar1_move = 0.
                elif event.key == K_DOWN:
                    bar1_move = 0.
        
        score1 = font.render(str(bar1_score), True,(255,255,255))
        score2 = font.render(str(bar2_score), True,(255,255,255))

        screen.blit(background,(0,0))
        frame = pygame.draw.rect(screen,(255,255,255),Rect((5,5),(630,470)),2)
        middle_line = pygame.draw.aaline(screen,(255,255,255),(330,5),(330,475))
        screen.blit(bar1,(bar1_x,bar1_y))
        screen.blit(bar2,(bar2_x,bar2_y))
        screen.blit(circle,(circle_x,circle_y))
        screen.blit(score1,(250.,210.))
        screen.blit(score2,(380.,210.))

        bar1_y += bar1_move
        
    # movement of circle
        time_passed = clock.tick(30)
        time_sec = time_passed / 1000.0
        
        circle_x += speed_x * time_sec
        circle_y += speed_y * time_sec
        ai_speed = speed_circ * time_sec
    #AI of the computer.
        if circle_x >= 305.:
            if not bar2_y == circle_y + 7.5:
                if bar2_y < circle_y + 7.5:
                    bar2_y += ai_speed
                if  bar2_y > circle_y - 42.5:
                    bar2_y -= ai_speed
            else:
                bar2_y == circle_y + 7.5
        
        if bar1_y >= 420.: bar1_y = 420.
        elif bar1_y <= 10. : bar1_y = 10.
        if bar2_y >= 420.: bar2_y = 420.
        elif bar2_y <= 10.: bar2_y = 10.

    # Circle hits bar 
        
        if circle_x <= bar1_x + 10.:
            if circle_y >= bar1_y - 7.5 and circle_y <= bar1_y + 42.5:
                circle_x = 20.
                speed_x = -speed_x
        if circle_x >= bar2_x - 15.:
            if circle_y >= bar2_y - 7.5 and circle_y <= bar2_y + 42.5:
                circle_x = 605.
                speed_x = -speed_x
        if circle_x < 5.:
            bar2_score += 1
            circle_x, circle_y = 320., 232.5
            bar1_y,bar_2_y = 215., 215.
        elif circle_x > 620.:
            bar1_score += 1
            circle_x, circle_y = 307.5, 232.5
            bar1_y, bar2_y = 215., 215.
        if circle_y <= 10.:
            speed_y = -speed_y
            circle_y = 10.
        elif circle_y >= 457.5:
            speed_y = -speed_y
            circle_y = 457.5

    #Winning thing
            
            if bar1_score > 3 and bar2_score < bar1_score:
                ctypes.windll.user32.MessageBoxW(0, "Congratulations!", "YOU WON!", 1)
                quit()
            elif bar2_score > 3 and bar1_score < bar2_score:
                ctypes.windll.user32.MessageBoxW(0, "Too bad! Better luck next time.", "YOU LOST!", 1)
                quit()

        pygame.display.update()


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