Why did this work?

Question

Im writing and game in python using pygame. Im working on hero movement and couldnt get my hero to move by simply holding down a directional key I had to continually tap it. I solved the problem by adding a line of code:"pygame.key.set_repeat(True)" i added this code under the line that says keys = pygame.key.get_pressed() and it didnt work.
Then i decided to add it above the main loop as you will see and it worked. So problem is fixed but i need to know why.

Heres the code:

import pygame
pygame.init()

win = pygame.display.set_mode((500,500))

pygame.display.set_caption("My First Pygame")

x = 50
y = 425
width = 40
height = 60
vel = 5

isJump = True
jumpCount = 10
pygame.key.set_repeat(True)
run = True
while run:
pygame.time.delay(100)

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

keys = pygame.key.get_pressed()

if keys[pygame.K_LEFT] and x > vel:
x -= vel

Answer 1

Maybe its like a configuration and you have to set it before using it? I don't know but that would make sense

Answer 2

That actually makes perfect sense