Handle unusual __qualname__ in inspect

CHANGELOG.md

@@ -11,6 +11,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Python3.14 compatibility https://github.com/Textualize/rich/pull/3861
 
+### Fixed
+
+- Fixed exception when callling `inspect` on objects with unusual `__qualname__` attribute https://github.com/Textualize/rich/pull/3894
+
 ## [14.1.0] - 2025-06-25
 
 ### Changed

CONTRIBUTORS.md

@@ -94,3 +94,4 @@ The following people have contributed to the development of Rich:
 - [Jonathan Helmus](https://github.com/jjhelmus)
 - [Brandon Capener](https://github.com/bcapener)
 - [Alex Zheng](https://github.com/alexzheng111)
+- [Sebastian Speitel](https://github.com/SebastianSpeitel)

rich/_inspect.py

@@ -101,6 +101,10 @@ class Inspect(JupyterMixin):
         signature_text = self.highlighter(_signature)
 
         qualname = name or getattr(obj, "__qualname__", name)
+        if not isinstance(qualname, str):
+            qualname = getattr(obj, "__name__", name)
+            if not isinstance(qualname, str):
+                qualname = name
 
         # If obj is a module, there may be classes (which are callable) to display
         if inspect.isclass(obj):

tests/test_inspect.py

@@ -404,6 +404,19 @@ def test_inspect_module_with_class():
     assert render(module, methods=True) == expected
 
 
+def test_qualname_in_slots():
+    from functools import lru_cache
+
+    @lru_cache
+    class Klass:
+        __slots__ = ("__qualname__",)
+
+    try:
+        inspect(Klass)
+    except Exception as e:
+        assert False, f"Class with __qualname__ in __slots__ shouldn't raise {e}"
+
+
 @pytest.mark.parametrize(
     "special_character,expected_replacement",
     (