diff --git a/1_snake_game/3_moving_block_and_timer.py b/1_snake_game/3_moving_block_and_timer.py
index 6dc9ca0..62e5209 100644
--- a/1_snake_game/3_moving_block_and_timer.py
+++ b/1_snake_game/3_moving_block_and_timer.py
@@ -4,39 +4,39 @@
 from pygame.locals import *
 import time
 
+
 class Snake:
     def __init__(self, surface):
         self.parent_screen = surface
         self.block = pygame.image.load("resources/block.jpg").convert()
         self.x = 100
         self.y = 100
-        self.direction = 'down'
+        self.direction = "down"
 
     def move_left(self):
-        self.direction = 'left'
+        self.direction = "left"
 
     def move_right(self):
-        self.direction = 'right'
+        self.direction = "right"
 
     def move_up(self):
-        self.direction = 'up'
+        self.direction = "up"
 
     def move_down(self):
-        self.direction = 'down'
+        self.direction = "down"
 
     def walk(self):
-        if self.direction == 'left':
+        if self.direction == "left":
             self.x -= 10
-        if self.direction == 'right':
+        if self.direction == "right":
             self.x += 10
-        if self.direction == 'up':
+        if self.direction == "up":
             self.y -= 10
-        if self.direction == 'down':
+        if self.direction == "down":
             self.y += 10
 
         self.draw()
 
-
     def draw(self):
         self.parent_screen.fill((110, 110, 5))
 
@@ -77,10 +77,9 @@ def run(self):
 
             self.snake.walk()
 
-            time.sleep(.2)
+            time.sleep(0.2)
+
 
-if __name__ == '__main__':
+if __name__ == "__main__":
     game = Game()
     game.run()
-
-