Pygame, how to remove trail from a player when moving, I tried filling screen but still didnt work for me

So I am trying to remove the trail from player while it moves. I tried to do screen.fill, but when I do it, then the whole map disappears. I want to achieve a simple moving ascii letter. – tiles(map1) is supposed to draw the map, however if I put screen.fill before it, then the map will disappear i have no idea why.

import pygame
from pygame import key
from pygame.draw import rect
from pygame.locals import *

pygame.init()
fpsClock = pygame.time.Clock()

resmulti=3
spritesize=16*resmulti
resolution=(256*resmulti,224*resmulti)
screen = pygame.display.set_mode((resolution[0], resolution[1]))

pygame.display.set_caption("test")

player_character = "@"
player_color = (255, 0, 0)
player_size = 20
current_position = [0, 1]

player = pygame.font.Font(None, player_size).render(player_character,False, player_color)
tile = pygame.draw.rect(screen, (255,255,255), [0,0,10,10])


map1 = """

wwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwww
w                                w
w      wwwww      w   ww         w
w                     w          w
w        w                       w
w                www      www    w
w            w    w       w      w
w      w          w       w      w
w      w      wwwww      www     w
w                                w
wwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwwww
"""
map1 = map1.splitlines()

gameRunning = True

background = pygame.image.load("bg.png")

def tiles(map1):
    global tile
    for y,line in enumerate(map1):
        for x,c in enumerate(line):
            if c == "w":
                screen.blit(screen,(x*16,y*16),tile)


p_x = 20
p_y = 90
while gameRunning:

    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            gameRunning = False
            break
        
    keys = pygame.key.get_pressed()

    if keys[K_DOWN]:
        p_y += 2
    elif keys[K_UP]:
        p_y = p_y - 2
    elif keys[K_LEFT]:
        p_x = p_x - 2
    elif keys[K_RIGHT]:
        p_x += 2


    tiles(map1)

    screen.blit(player,(p_x,p_y))

    fpsClock.tick(60)
    pygame.display.update()

>Solution :

tile = pygame.draw.rect(screen, (255,255,255), [0,0,10,10])

That returns a pygame.Rect object, so tile is a rect.

Then you use tile in the blit function.

screen.blit(screen,(x*16,y*16),tile)

But from pygame’s documentation, blit takes a pygame.Surface not a rect.

To fix the problem.

Make tile a pygame.Surface.

#tile = pygame.draw.rect(screen, (255,255,255), [0,0,10,10])
tile = pygame.Surface((10, 10)).convert()
tile.fill((255, 255, 255))

Draw the tile as follows.

if c == "w":
     screen.blit(tile,(x*16,y*16))

Then clear screen, draw tiles, draw player.

screen.fill((0, 0, 0))
tiles(map1)
screen.blit(player,(p_x,p_y))