gh-106046: Improve error message from `os.fspath` if `__fspath__` is set to `None` (#106082)

1 files changed, 6 insertions, 0 deletions

diff --git a/Lib/os.py b/Lib/os.py
index 31b957f..d8c9ba4 100644
--- a/Lib/os.py
+++ b/Lib/os.py
@@ -1061,6 +1061,12 @@ def _fspath(path):
         else:
             raise TypeError("expected str, bytes or os.PathLike object, "
                             "not " + path_type.__name__)
+    except TypeError:
+        if path_type.__fspath__ is None:
+            raise TypeError("expected str, bytes or os.PathLike object, "
+                            "not " + path_type.__name__) from None
+        else:
+            raise
     if isinstance(path_repr, (str, bytes)):
         return path_repr
     else: