Clean up minor formatting issues with the tutorial

docs/tutorial/part-01.rst

@@ -94,7 +94,7 @@ Use the code :python:`for event in tcod.event.wait():` to begin handing events.
 
 In the event loop start with the line :python:`print(event)` so that all events can be viewed from the program output.
 Then test if an event is for closing the window with :python:`if isinstance(event, tcod.event.Quit):`.
-If this is True then you should exit the function with :python:`raise SystemExit()`. [#why_raise]_
+If this is True then you should exit the function with :python:`raise SystemExit`. [#why_raise]_
 
 .. code-block:: python
     :emphasize-lines: 3,5,15-23
@@ -121,7 +121,7 @@ If this is True then you should exit the function with :python:`raise SystemExit
                 for event in tcod.event.wait():  # Event loop, blocks until pending events exist
                     print(event)
                     if isinstance(event, tcod.event.Quit):
-                        raise SystemExit()
+                        raise SystemExit
 
 
     if __name__ == "__main__":
@@ -205,7 +205,7 @@ Modify the drawing routine so that the console is cleared, then passed to :pytho
                 for event in tcod.event.wait():
                     print(event)
                     if isinstance(event, tcod.event.Quit):
-                        raise SystemExit()
+                        raise SystemExit
 
 
     if __name__ == "__main__":
@@ -259,7 +259,7 @@ The full script so far is:
             """Move the player on events and handle exiting. Movement is hard-coded."""
             match event:
                 case tcod.event.Quit():
-                    raise SystemExit()
+                    raise SystemExit
                 case tcod.event.KeyDown(sym=tcod.event.KeySym.LEFT):
                     self.player_x -= 1
                 case tcod.event.KeyDown(sym=tcod.event.KeySym.RIGHT):
@@ -308,5 +308,5 @@ You can review the part-1 source code `here <https://github.com/HexDecimal/pytho
 .. [#init_context] This tutorial follows the setup for a fixed-size console.
                    The alternatives shown in :ref:`getting-started` are outside the scope of this tutorial.
 
-.. [#why_raise] You could use :python:`return` here to exit the ``main`` function and end the program, but :python:`raise SystemExit()` is used because it will close the program from anywhere.
-                :python:`raise SystemExit()` is also more useful to teach than :any:`sys.exit`.
+.. [#why_raise] You could use :python:`return` here to exit the ``main`` function and end the program, but :python:`raise SystemExit` is used because it will close the program from anywhere.
+                :python:`raise SystemExit` is also more useful to teach than :any:`sys.exit`.

docs/tutorial/part-02.rst

@@ -327,6 +327,8 @@ Use :python:`from tcod.event import KeySym` to make ``KeySym`` enums easier to w
 
     """Global constants are stored here."""
 
+    from __future__ import annotations
+
     from typing import Final
 
     from tcod.event import KeySym
@@ -386,7 +388,7 @@ The query to fetch player entities is :python:`g.world.Q.all_of(tags=[IsPlayer])
 We expect only one player so the result will be unpacked into a single name: :python:`(player,) = g.world.Q.all_of(tags=[IsPlayer])`.
 
 Next is to handle the event.
-Handling :python:`case tcod.event.Quit():` is the same as before: :python:`raise SystemExit()`.
+Handling :python:`case tcod.event.Quit():` is the same as before: :python:`raise SystemExit`.
 
 The case for direction keys will now be done in a single case: :python:`case tcod.event.KeyDown(sym=sym) if sym in DIRECTION_KEYS:`.
 ``sym=sym`` assigns from the event attribute to a local name.
@@ -419,7 +421,7 @@ Then use :python:`gold.clear()` at the end to remove all components and tags fro
             (player,) = g.world.Q.all_of(tags=[IsPlayer])
             match event:
                 case tcod.event.Quit():
-                    raise SystemExit()
+                    raise SystemExit
                 case tcod.event.KeyDown(sym=sym) if sym in DIRECTION_KEYS:
                     player.components[Position] += DIRECTION_KEYS[sym]
                     # Auto pickup gold
@@ -499,7 +501,7 @@ It should be at the same level as the ``for`` loop and not inside of it.
             (player,) = g.world.Q.all_of(tags=[IsPlayer])
             match event:
                 case tcod.event.Quit():
-                    raise SystemExit()
+                    raise SystemExit
                 case tcod.event.KeyDown(sym=sym) if sym in DIRECTION_KEYS:
                     player.components[Position] += DIRECTION_KEYS[sym]
                     # Auto pickup gold

docs/tutorial/part-03.rst

@@ -301,7 +301,7 @@ Menus
             """Handle events for menus."""
             match event:
                 case tcod.event.Quit():
-                    raise SystemExit()
+                    raise SystemExit
                 case tcod.event.KeyDown(sym=sym) if sym in DIRECTION_KEYS:
                     dx, dy = DIRECTION_KEYS[sym]
                     if dx != 0 or dy == 0:
@@ -379,7 +379,7 @@ Update states
         @staticmethod
         def quit() -> StateResult:
             """Close the program."""
-            raise SystemExit()
+            raise SystemExit
 
 .. code-block:: python
     :emphasize-lines: 2,5,19-23
@@ -393,7 +393,7 @@ Update states
             (player,) = g.world.Q.all_of(tags=[IsPlayer])
             match event:
                 case tcod.event.Quit():
-                    raise SystemExit()
+                    raise SystemExit
                 case tcod.event.KeyDown(sym=sym) if sym in DIRECTION_KEYS:
                     player.components[Position] += DIRECTION_KEYS[sym]
                     # Auto pickup gold