QA fixes

examples/multi_player.py

@@ -77,7 +77,7 @@ def draw(self, display):
         display.pixel(int(self.x), int(self.y))
 
     def is_on_screen(self):
-        return self.x >= 0 and self.x < WIDTH and  self.y >= 0 and self.y < HEIGHT
+        return self.x >= 0 and self.x < WIDTH and self.y >= 0 and self.y < HEIGHT
 
     def has_hit(self, player):
         xdiff = self.x - player.x

examples/random_maze.py

@@ -81,7 +81,7 @@ def build(self, width, height):
             raise ValueError("width out of range. Expected greater than 0")
 
         if height <= 0:
-            raise ValueError(f"height out of range. Expected greater than 0")
+            raise ValueError("height out of range. Expected greater than 0")
 
         self.width = width
         self.height = height
@@ -149,7 +149,6 @@ def build(self, width, height):
         self.grid_columns = (self.width * 2 + 1)
         self.grid_rows = (self.height * 2 + 1)
 
-
     def choose_neighbour(self, current):
         unvisited = []
         for dx in range(-1, 2, 2):
@@ -243,7 +242,6 @@ def build_maze():
     height = random.randrange(MIN_MAZE_HEIGHT, MAX_MAZE_HEIGHT)
     builder.build(width + difficulty, height + difficulty)
 
-
     wall_separation = min(HEIGHT // builder.grid_rows,
                           WIDTH // builder.grid_columns)
     wall_size = wall_separation - WALL_GAP