#!/bin/python
import pygame, sys
import random
green = (0, 255, 0)
blue = (0, 0, 128)
red = (255, 0, 0)
pygame.init()
sc = pygame.display.set_mode((500, 500))
pygame.display.set_caption("Юркин танк поехал")
clock = pygame.time.Clock()
pygame.time.set_timer(pygame.USEREVENT, 100)
x = 250
y = 250
counter_1 = 0
random_selecting = random.randint(0,3)
while True:
   sc.fill((125,125,125))
   for event in pygame.event.get():
      if event.type == pygame.QUIT:
         pygame.quit()
         sys.exit()
      if event.type == pygame.USEREVENT:
         counter_1 = counter_1 + 5
         if counter_1 == 50:
          random_selecting = random.randint(0,3)
          counter_1 = 0
         if random_selecting == 0:
          x = x + 5
         if random_selecting == 1:
          x = x - 5
         if random_selecting == 2:
          y = y + 5
         if random_selecting == 3:
          y = y - 5
   if x < 0: 
    x = 0
   if x > 450: 
    x = 450
   if y < 0: 
    y = 0
   if y > 450: 
    y = 450
   pygame.draw.rect(sc, (255, 255, 255), (x, y, 50, 50))

   
   
   pygame.display.flip()