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diff --git a/challenge-285/ppentchev/python/src/perl_weekly_285/defs.py b/challenge-285/ppentchev/python/src/perl_weekly_285/defs.py
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+# SPDX-FileCopyrightText: Peter Pentchev <roam@ringlet.net>
+# SPDX-License-Identifier: BSD-2-Clause
+"""Common definitions for the perl-weekly-285 library."""
+
+from __future__ import annotations
+
+import dataclasses
+import typing
+
+
+if typing.TYPE_CHECKING:
+    from typing import Final
+
+
+VERSION: Final = "0.1.0"
+"""The perl-weekly-285 library version, semver-like."""
+
+
+@dataclasses.dataclass
+class Error(Exception):
+    """An error that occurred during the processing."""
+
+    def __str__(self) -> str:
+        """Provide a human-readable error message."""
+        return f"{type(self).__str__} must be overridden for {self!r}"
+
+
+@dataclasses.dataclass
+class NoSolutionError(Error):
+    """No solution could be found."""
+
+    def __str__(self) -> str:
+        """Provide a human-readable error message."""
+        return f"Could not find a solution: {self!r}"