[fix] Python3.8 custom 'cache' decorator

CHANGELOG.md

@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [0.7.1] - 2-24-02-26
+
+### Fixed
+
+- Specific `cache` mechanism for Python3.8 (`functools.cache` does not exists yet)
+
 ## [0.7.0] - 2024-02-26
 
 ### Changed

speculos/mcu/display.py

@@ -2,7 +2,11 @@
 
 import io
 from abc import ABC, abstractmethod
-from functools import cache
+try:
+    from functools import cache
+except ImportError:
+    from functools import lru_cache
+    cache = lru_cache(maxsize=None)
 from PIL import Image
 from socket import socket
 from typing import Any, Dict, IO, List, Optional, Tuple, Union

speculos/mcu/nbgl.py

@@ -3,7 +3,11 @@
 import sys
 from construct import Struct, Int8ul, Int16ul
 from enum import IntEnum
-from functools import cache
+try:
+    from functools import cache
+except ImportError:
+    from functools import lru_cache
+    cache = lru_cache(maxsize=None)
 from typing import Tuple
 
 from .display import FrameBuffer, GraphicLibrary