Fix not erasing the previous waiter position

src/main.py

@@ -8,16 +8,23 @@ class Waiter(pygame.sprite.Sprite):
         pygame.sprite.Sprite.__init__(self)
         self.moveX = 0
         self.moveY = 0
+        self.clearX = 0
+        self.clearY = 0
         self.frame = 0
-        self.image = waiter
+        self.imageWaiter = waiter
+        self.imageFloor = floor
 
     def move(self, x, y):
         self.moveX += x
         self.moveY -= y
 
+    def clear(self, x, y):
+        cx = self.moveX + x
+        cy = self.moveY + y
+        screen.blit(self.imageFloor, (cx * block_size, cy * block_size))
+
     def update(self):
-        screen.blit(floor, ())
+        screen.blit(self.imageWaiter, (self.moveX * block_size, self.moveY * block_size))
-        screen.blit(waiter, (self.moveX * block_size, self.moveY * block_size))
 
 
 # SETUP
@@ -38,8 +45,6 @@ waiter = pygame.image.load('../resources/images/waiter.png')
 def drawBackground():
     for y in range(15):
         for x in range(14):
-            # rect = pygame.Rect(x * block_size, y * block_size, block_size - 1, block_size - 1)
-            # pygame.draw.rect(screen, floor, rect)
             screen.blit(floor, (x * block_size, y * block_size))
 
 
@@ -57,14 +62,18 @@ def main():
             if event.type == pygame.KEYDOWN:
                 if event.key == pygame.K_LEFT:
                     waiterPly.move(-rect, 0)
+                    waiterPly.clear(rect, 0)
                 if event.key == pygame.K_RIGHT:
                     waiterPly.move(rect, 0)
+                    waiterPly.clear(-rect, 0)
                 if event.key == pygame.K_UP:
                     waiterPly.move(0, rect)
+                    waiterPly.clear(0, rect)
                 if event.key == pygame.K_DOWN:
                     waiterPly.move(0, -rect)
+                    waiterPly.clear(0, -rect)
         waiterPly.update()
-        pygame.display.update()
+        pygame.display.flip()
         clock.tick(fps)