QA: Fix bugbears.

Author: Gadgetoid

examples/badapple.py

@@ -72,5 +72,6 @@ def render(data:ptr8, x:int, y:int, next_tick:int):  # noqa: F821
 # Read out the file and render
 while True:
     data = video.read(1024)
-    if len(data) < 1024: break
+    if len(data) < 1024:
+        break
     x, y, next_tick = render(data, x, y, next_tick)

examples/balls_demo.py

@@ -23,7 +23,7 @@ def __init__(self, x, y, r, dx, dy, pen):
 
 # initialise shapes
 balls = []
-for i in range(0, 170):
+for _ in range(0, 170):
     r = random.randint(0, 10) + 3
     balls.append(
         Ball(

examples/image_gallery.py

@@ -126,7 +126,7 @@ def fizzlefade():
 
     while True:
 
-        for i in range(2000):
+        for _ in range(2000):
             x, y = return_point()
             if x > -1 and y > -1:
                 display.pixel(x, y)

examples/multi_player.py

@@ -198,9 +198,9 @@ def check_hits(self, players):
                 try:
                     p.update()
                 # Handle QwSTPads being disconnected unexpectedly
-                except OSError:
+                except OSError as err:
                     print(f"P{p.index + 1}: Disconnected ... Exiting")
-                    raise SystemExit
+                    raise SystemExit from err
 
             # Check if any projectiles have hit players
             for p in players:

examples/random_maze.py

@@ -151,7 +151,7 @@ def build(self, width, height):
         self.maze = []
 
         row = [1]
-        for x in range(0, self.width):
+        for _ in range(0, self.width):
             row.append(1)
             row.append(1)
         self.maze.append(row)