[Python] Simple problem with pygame that I can't figure out

So, I made this very simple code and I need help to know why it doesn't work. Here is the code:

import pygame as py
from pygame import Vector2
scr = py.display.set_mode((800,400))
def test():
scr1 = py.display.get_surface()
sur = py.surface.Surface((0,0))
scr1.blit(sur,(400,200))
sur.fill((255,255,255))
while True:
for event in py.event.get():
if event.type == py.QUIT:
py.quit()
exit()
scr.fill((0,0,0))
test()
py.display.update()



So, I tried pulling everything that is inside the function to outside of it, but that didn't work as well, I expected a white square in the middle of the screen, but is just pure black. Can anybody help me?

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