Перемещение персонажа

import urllib.request
import pygame
from time import sleep


print('Введите имя файла уровня:')
lev = input()
f = open(lev, 'r')
jh, ih = 3, 3
initial = 1
vis = 0
pole = []
for i in f:
    t = i.split()
    vis += 1
    shir = len(t)
    pole.append(t)
f.close()
f, h = urllib.request.urlretrieve('https://yastatic.net/s3/lyceum/content/image/pygame/mar.png')
img_pers = open(f)
f, h = urllib.request.urlretrieve('https://yastatic.net/s3/lyceum/content/image/pygame/box.png')
img_korobka = open(f)
f, h = urllib.request.urlretrieve('https://yastatic.net/s3/lyceum/content/image/pygame/grass.png')
img_trava = open(f)
f, h = urllib.request.urlretrieve('https://i.ibb.co/c6bDyqC/fon.png')
img_zastavka = open(f)
if __name__ == '__main__':
    pygame.init()
    pygame.display.set_caption('Перемещение героя')
    x, y = 0, 0
    size = width, height = shir * 50, vis * 50
    sc = pygame.display.set_mode(size)
    img_pers = pygame.image.load(img_pers)
    img_korobka = pygame.image.load(img_korobka).convert()
    img_trava = pygame.image.load(img_trava).convert()
    img_zastavka = pygame.image.load(img_zastavka).convert()
    img_zastavka = pygame.transform.scale(img_zastavka, (shir * 50, vis * 50))
    sleep(1)
    sc.blit(img_zastavka, (0, 0))
    pygame.display.update()
    while True:
        for i in pygame.event.get():
            if i.type == pygame.QUIT:
                pygame.quit()
            elif i.type == pygame.KEYDOWN:
                if initial == 1:
                    for ii in range(len(pole)):
                        for j in range(len(pole[0])):
                            if pole[ii][j] == 'X':
                                sc.blit(img_korobka, (j * 50, ii * 50))
                            elif pole[ii][j] == '0':
                                sc.blit(img_trava, (j * 50, ii * 50))
                    sc.blit(img_pers, (jh * 50 + 14, ih * 50 + 10))
                    pygame.display.update()
                    initial = 0
                if i.key == pygame.K_DOWN:
                    if ih + 1 < len(pole):
                        if pole[ih + 1][jh] == '0':
                            sc.blit(img_trava, (jh * 50, ih * 50))
                            ih += 1
                            sc.blit(img_pers, (jh * 50 + 14, ih * 50 + 10))
                        pygame.display.update()
                elif i.key == pygame.K_UP:
                    if ih - 1 >= 0:
                        if pole[ih - 1][jh] == '0':
                            sc.blit(img_trava, (jh * 50, ih * 50))
                            ih -= 1
                            sc.blit(img_pers, (jh * 50 + 14, ih * 50 + 10))
                            pygame.display.update()
                elif i.key == pygame.K_LEFT:
                    if jh - 1 >= 0:
                        if pole[ih][jh - 1] == '0':
                            sc.blit(img_trava, (jh * 50, ih * 50))
                            jh -= 1
                            sc.blit(img_pers, (jh * 50 + 14, ih * 50 + 10))
                            pygame.display.update()
                elif i.key == pygame.K_RIGHT:
                    if jh + 1 < len(pole[0]):
                        if pole[ih][jh + 1] == '0':
                            sc.blit(img_trava, (jh * 50, ih * 50))
                            jh += 1
                            sc.blit(img_pers, (jh * 50 + 14, ih * 50 + 10))
                            pygame.display.update()
    pygame.quit()