Update pyupgrade's target version to Python 3.9 (#2024)

* Update ruff's Python target-version value to 3.9

We no longer support Python 3.8

* Apply "import replacements" fixes from pyupgrade

https://github.com/asottile/pyupgrade?tab=readme-ov-file#import-replacements

* Apply "replace @functools.lru_cache(maxsize=None) with shorthand" fixes from pyupgrade

https://github.com/asottile/pyupgrade?tab=readme-ov-file#replace-functoolslru_cachemaxsizenone-with-shorthand

debug_toolbar/middleware.py

@@ -4,7 +4,7 @@
 
 import re
 import socket
-from functools import lru_cache
+from functools import cache
 
 from asgiref.sync import iscoroutinefunction, markcoroutinefunction
 from django.conf import settings
@@ -46,7 +46,7 @@ def show_toolbar(request):
     return False
 
 
-@lru_cache(maxsize=None)
+@cache
 def get_show_toolbar():
     # If SHOW_TOOLBAR_CALLBACK is a string, which is the recommended
     # setup, resolve it to the corresponding callable.

debug_toolbar/panels/sql/utils.py

@@ -1,4 +1,4 @@
-from functools import lru_cache
+from functools import cache, lru_cache
 from html import escape
 
 import sqlparse
@@ -107,7 +107,7 @@ def parse_sql(sql, *, simplify=False):
     return "".join(stack.run(sql))
 
 
-@lru_cache(maxsize=None)
+@cache
 def get_filter_stack(*, simplify):
     stack = sqlparse.engine.FilterStack()
     if simplify:

debug_toolbar/settings.py

@@ -1,6 +1,6 @@
 import sys
 import warnings
-from functools import lru_cache
+from functools import cache
 
 from django.conf import settings
 from django.dispatch import receiver
@@ -49,7 +49,7 @@
 }
 
 
-@lru_cache(maxsize=None)
+@cache
 def get_config():
     USER_CONFIG = getattr(settings, "DEBUG_TOOLBAR_CONFIG", {})
     CONFIG = CONFIG_DEFAULTS.copy()
@@ -75,7 +75,7 @@ def get_config():
 ]
 
 
-@lru_cache(maxsize=None)
+@cache
 def get_panels():
     try:
         PANELS = list(settings.DEBUG_TOOLBAR_PANELS)

debug_toolbar/toolbar.py

@@ -5,7 +5,7 @@
 import re
 import uuid
 from collections import OrderedDict
-from functools import lru_cache
+from functools import cache
 
 from django.apps import apps
 from django.conf import settings
@@ -180,7 +180,7 @@ def is_toolbar_request(cls, request):
         return resolver_match.namespaces and resolver_match.namespaces[-1] == APP_NAME
 
     @staticmethod
-    @lru_cache(maxsize=None)
+    @cache
     def get_observe_request():
         # If OBSERVE_REQUEST_CALLBACK is a string, which is the recommended
         # setup, resolve it to the corresponding callable.

debug_toolbar/utils.py

@@ -5,8 +5,9 @@
 import os.path
 import sys
 import warnings
+from collections.abc import Sequence
 from pprint import PrettyPrinter, pformat
-from typing import Any, Sequence
+from typing import Any
 
 from asgiref.local import Local
 from django.http import QueryDict

pyproject.toml

@@ -51,7 +51,7 @@ packages = [
 path = "debug_toolbar/__init__.py"
 
 [tool.ruff]
-target-version = "py38"
+target-version = "py39"
 
 fix = true
 show-fixes = true