diff --git a/scrapy/utils/spider.py b/scrapy/utils/spider.py
index f1904e8f0..42b43b7d0 100644
--- a/scrapy/utils/spider.py
+++ b/scrapy/utils/spider.py
@@ -61,14 +61,13 @@ def iter_spider_classes(
     :attr:`~scrapy.Spider.name` is also excluded.
     """
     for obj in vars(module).values():
-        if (
-            inspect.isclass(obj)
-            and issubclass(obj, Spider)
-            and obj.__module__ == module.__name__
-            and not obj._is_ignored()
-            and (not require_name or getattr(obj, "name", None))
-        ):
-            yield obj
+        if not inspect.isclass(obj) or not issubclass(obj, Spider):
+            continue
+        if obj.__module__ != module.__name__ or obj._is_ignored():
+            continue
+        if require_name and not getattr(obj, "name", None):
+            continue
+        yield obj
 
 
 @overload
diff --git a/tox.ini b/tox.ini
index edde83356..fa0bf0057 100644
--- a/tox.ini
+++ b/tox.ini
@@ -111,7 +111,9 @@ commands =
     pre-commit run {posargs:--all-files}
 
 [testenv:pylint]
-basepython = python3
+# Version-dependent code and pylint suppressions require a fixed interpreter.
+# Keep in sync with the pylint job in .github/workflows/checks.yml.
+basepython = python3.14
 deps =
     {[testenv:extra-deps]deps}
     pylint==4.0.6