[Python] Font not displaying?

I've tried changing font size, font color, and font location. What is wrong with code?

import pygame
pygame.font.init()#to start pygame
screen_width, screen_height = 1920, 1080
screen=pygame.display.set_mode((screen_width,screen_height))
pygame.display.set_caption("my pygame window")


def objects():
player=pygame.Rect(400,300,100,100)
boundary = pygame.Rect(100, 80, 600, 400)
boundary_water= pygame.Rect(-50, -70, 900, 700)
obstacle=pygame.Rect(300,400,50,50)
speedofplayer=5
score=0
collide_frame=False
clock = pygame.time.Clock()
running=True
return player,boundary,obstacle,speedofplayer,clock,running,boundary_water,collide_frame,score

def obstacles(keys,player,obstacle):
if keys[pygame.K_a] or keys[pygame.K_LEFT] :
player.left=obstacle.right
if keys[pygame.K_d] or keys[pygame.K_RIGHT]:
player.right=obstacle.left
if keys[pygame.K_w] or keys[pygame.K_UP]:
player.top=obstacle.bottom
if keys[pygame.K_s] or keys[pygame.K_DOWN]:
player.bottom=obstacle.top

def player_movement(keys,player,speedofplayer):
if keys[pygame.K_a] or keys[pygame.K_LEFT] :
player.x-=speedofplayer
if keys[pygame.K_d] or keys[pygame.K_RIGHT]:
player.x+=speedofplayer
if keys[pygame.K_w] or keys[pygame.K_UP]:
player.y-=speedofplayer
if keys[pygame.K_s] or keys[pygame.K_DOWN]:
player.y+=speedofplayer


def boundaries(player,boundary):
if player.left<boundary.left:
player.left=boundary.left
if player.right>boundary.right:
player.right=boundary.right
if player.top<boundary.top:
player.top=boundary.top
if player.bottom>boundary.bottom:
player.bottom=boundary.bottom

def score_ofplayer(screen,score,collide_frame,player,obstacle,font):

pass

def run_program():

player,boundary,obstacle,speedofplayer,clock,running,boundary_water,collide_frame,score=objects()
while running:
for event in pygame.event.get():
if event.type==pygame.QUIT:
running=False
keys=pygame.key.get_pressed()
player_movement(keys,player,speedofplayer)
boundaries(player,boundary)
if player.colliderect(obstacle):
obstacles(keys,player,obstacle)
camera_x = player.x - screen_width // 2
camera_y = player.y - screen_height // 2
player_draw = pygame.Rect(player.x - camera_x, player.y - camera_y, player.width, player.height)
obstacle_draw = pygame.Rect(obstacle.x - camera_x, obstacle.y - camera_y, obstacle.width, obstacle.height)
boundary_draw = pygame.Rect(boundary.x - camera_x, boundary.y - camera_y, boundary.width, boundary.height)
boundary_water_draw=pygame.Rect(boundary_water.x - camera_x, boundary_water.y-camera_y,boundary_water.width,boundary_water.height)

font=pygame.font.SysFont(None,36)

screen.fill((0,255,0))


pygame.draw.rect(screen,'blue',obstacle_draw)
pygame.draw.rect(screen,'blue',boundary_water_draw, width=100)
pygame.draw.rect(screen, "white", boundary_draw, width=3)
pygame.draw.rect(screen,'orange',player_draw)

if player.colliderect(obstacle):
if not collide_frame:
score+=1
collide_frame = True
else:
collide_frame=False
screentext=font.render(f"score= {score}",True,(255, 255, 255))
screen.blit(screentext,(20,20))

pygame.display.flip()
clock.tick(60)
pygame.quit()
run_program()



My font doesn't display on pygame window, I've removed the font from a function for now and directly inserted it in the game loop, but it still doesn't work, I've tried changing color of font also.

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