Fix flake8 errors

Author: acsany

top-python-game-engines/README.md

@@ -84,6 +84,11 @@ Alternately, you can use `pgzrun` to run both games:
 (venv) $ pgzrun pygame_zero_game.py
 ```
 
+### Note
+Checkers like [flake8 are unaware](https://pygame-zero.readthedocs.io/en/latest/installation.html#for-flake8-pyflakes) of Pygame Zero's extra builtins.
+That's why xou'll find `# noqa: F821` inline comments in `pygame_zero_basic.py` and `pygame_zero_game.py`.
+With the `# noqa` inline comments [flake8](https://flake8.pycqa.org/en/3.1.1/user/ignoring-errors.html#in-line-ignoring-errors) ignores the errors that these lines would cause.
+
 ## Arcade
 
 To run the Arcade sample code, first activate the virtual environment:

top-python-game-engines/adventurelib/adventurelib_basic.py

@@ -188,5 +188,5 @@ def use(item: str):
 if __name__ == "__main__":
     # Look at out starting room
     look()
-    
+
     adv.start()

top-python-game-engines/pygame_zero/pygame_zero_basic.py

@@ -23,22 +23,22 @@ def draw():
     """Draw is called once per frame to render everything on the screen"""
 
     # Clear the screen first
-    screen.clear()
+    screen.clear()  # noqa: F821
 
     # Set the background color to white
-    screen.fill("white")
+    screen.fill("white")  # noqa: F821
 
     # Draw a blue circle with a radius of 50 in the center of the screen
-    screen.draw.filled_circle(
+    screen.draw.filled_circle(  # noqa: F821
         (WIDTH // 2, HEIGHT // 2), 50, "blue"
     )
 
     # Draw a red outlined square in the top left corner of the screen
-    red_square = Rect((50, 50), (100, 100))
-    screen.draw.rect(red_square, (200, 0, 0))
+    red_square = Rect((50, 50), (100, 100))  # noqa: F821
+    screen.draw.rect(red_square, (200, 0, 0))  # noqa: F821
 
     # Draw an orange caption along the bottom in 60 point font
-    screen.draw.text(
+    screen.draw.text(  # noqa: F821
         "Hello, World! From Pygame Zero!",
         (100, HEIGHT - 50),
         fontsize=60,

top-python-game-engines/pygame_zero/pygame_zero_game.py

@@ -25,7 +25,7 @@
 HEIGHT = 600
 
 # Setup the player
-player = Actor("alien_green_stand")
+player = Actor("alien_green_stand")  # noqa: F821
 player_position = WIDTH // 2, HEIGHT // 2
 player.center = player_position
 
@@ -48,7 +48,7 @@ def add_coin():
     global coin_list, coin_countdown
 
     # Create a new coin Actor at a random location
-    new_coin = Actor(
+    new_coin = Actor(  # noqa: F821
         "coin_gold", (randint(10, WIDTH - 10), randint(10, HEIGHT - 10))
     )
 
@@ -65,7 +65,7 @@ def add_coin():
         coin_countdown = 0.1
 
     # Schedule the next coin addition
-    clock.schedule(add_coin, coin_countdown)
+    clock.schedule(add_coin, coin_countdown)  # noqa: F821
 
 
 def on_mouse_move(pos: Tuple):
@@ -109,7 +109,7 @@ def update(delta_time: float):
     # Check each coin in the list for a collision
     for coin in coin_list:
         if player.colliderect(coin):
-            sounds.coin_pickup.play()
+            sounds.coin_pickup.play()  # noqa: F821
             coin_remove_list.append(coin)
             score += 10
 
@@ -120,7 +120,7 @@ def update(delta_time: float):
     # The game is over when there are too many coins on the screen
     if len(coin_list) >= COIN_COUNT:
         # Stop making new coins
-        clock.unschedule(add_coin)
+        clock.unschedule(add_coin)  # noqa: F821
 
         # Print the final score and exit the game
         print(f"Game over! Final score: {score}")
@@ -131,10 +131,10 @@ def draw():
     """Render everything on the screen once per frame"""
 
     # Clear the screen first
-    screen.clear()
+    screen.clear()  # noqa: F821
 
     # Set the background color to pink
-    screen.fill("pink")
+    screen.fill("pink")  # noqa: F821
 
     # Draw the player
     player.draw()
@@ -144,7 +144,7 @@ def draw():
         coin.draw()
 
     # Draw the current score at the bottom
-    screen.draw.text(
+    screen.draw.text(  # noqa: F821
         f"Score: {score}",
         (50, HEIGHT - 50),
         fontsize=48,
@@ -153,7 +153,7 @@ def draw():
 
 
 # Schedule the first coin to appear
-clock.schedule(add_coin, coin_countdown)
+clock.schedule(add_coin, coin_countdown)  # noqa: F821
 
 # Run the program
 pgzrun.go()