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venv/lib/python3.12/site-packages/fontTools/ufoLib/errors.py

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+from __future__ import annotations
+
+
+class UFOLibError(Exception):
+    pass
+
+
+class UnsupportedUFOFormat(UFOLibError):
+    pass
+
+
+class GlifLibError(UFOLibError):
+    """An error raised by glifLib.
+
+    This class is a loose backport of PEP 678, adding a :attr:`.note`
+    attribute that can hold additional context for errors encountered.
+
+    It will be maintained until only Python 3.11-and-later are supported.
+    """
+
+    def _add_note(self, note: str) -> None:
+        # Loose backport of PEP 678 until we only support Python 3.11+, used for
+        # adding additional context to errors.
+        # TODO: Replace with https://docs.python.org/3.11/library/exceptions.html#BaseException.add_note
+        (message, *rest) = self.args
+        self.args = ((message + "\n" + note), *rest)
+
+
+class UnsupportedGLIFFormat(GlifLibError):
+    pass