Fix bug with python 3.12 and improve dropping

tetris.py

@@ -92,11 +92,6 @@ class HashableDict(dict):
 
 
 class Action(NamedTuple):
-    key: int
-    type: Type
-    repeat: bool
-    desc: str
-
     class Type(Enum):
         # In Game
         ROTATE_LEFT = auto()
@@ -113,6 +108,11 @@ class Action(NamedTuple):
         # Help
         CLOSE_HELP = auto()
 
+    key: int
+    type: Type
+    repeat: bool
+    desc: str
+
     @staticmethod
     def make_map(*acts):
         return HashableDict({act.key: act for act in acts})
@@ -590,6 +590,8 @@ class Game:
             & set(self.pending_actions)
         ):
             self.subcell_move = 0
+        if Action.Type.DROP not in self.pending_actions:
+            self.stop_drop = False
         while self.pending_actions:
             match self.pending_actions.pop(0):
                 case Action.Type.ROTATE_LEFT:
@@ -598,7 +600,7 @@ class Game:
                     self.rotate_current_piece(Direction.RIGHT)
                 case Action.Type.SWAP_HOLD:
                     self.swap_with_hold()
-                case Action.Type.DROP:
+                case Action.Type.DROP if not self.stop_drop:
                     self.doing_drop = True
                 case Action.Type.MOVE_LEFT:
                     self.move_current_piece(Direction.LEFT)
@@ -614,6 +616,8 @@ class Game:
             for dx, cell in enumerate(row):
                 if cell:
                     self.board[y + dy][x + dx] = piece.color
+        # prevent user from accidentally dropping next piece too
+        self.stop_drop = True
 
     def advance_piece(self):
         speed = (
@@ -954,6 +958,7 @@ class Game:
     def clear_board(self):
         self.board = make_matrix(*Game.BOARD_SIZE)
 
+    # not in __init__ to facilitate debugging in ipython
     def init(self):
         pygame.init()
         self.screen = pygame.display.set_mode(
@@ -967,6 +972,7 @@ class Game:
         pygame.key.stop_text_input()
         self.key_states = defaultdict(lambda: False)
         self.pending_actions = []
+        self.stop_drop = False
 
         self.help_mode = False
         self.high_score = 0