From c742bc335c52ee0496cab998bb629c453ab719f8 Mon Sep 17 00:00:00 2001
From: Krzysztof Wojtas <kwojtas@gmail.com>
Date: Sun, 6 Oct 2024 03:31:28 +0200
Subject: [PATCH] #240 fix for Python <3.12

---
 src/book/data_structures.py | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/book/data_structures.py b/src/book/data_structures.py
index 05970a4..86aef35 100644
--- a/src/book/data_structures.py
+++ b/src/book/data_structures.py
@@ -9,17 +9,19 @@
 from typing_extensions import Self
 
 
+T = TypeVar('T')
+
+
 class Comparable(Protocol):
     def __le__(self, other: Any) -> bool:
         pass
 
 
-class Indexable[T](Protocol):
+class Indexable(Protocol[T]):
     __getitem__: Callable[[int], T]
     __setitem__: Callable[[int, T], None]
 
 
-T = TypeVar('T')
 CT = TypeVar('CT', bound=Comparable)
 Bit = Literal[0, 1]