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diff --git a/resources/libraries/python/MLRsearch/pep3140/classes.py b/resources/libraries/python/MLRsearch/pep3140/classes.py
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+# Copyright (c) 2023 Cisco and/or its affiliates.
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at:
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Module defining a subclass of dict with an alternative str method."""
+
+
+class Pep3140Dict(dict):
+    """A dict with str support as proposed in PEP 3140.
+
+    Python implemented str acting on dict such that the resulting string
+    shows both keys and values in their repr form.
+    Therefore, str() of a dict gives the same result as repr().
+
+    This class shows both keys and values their str form instead.
+    """
+
+    def __str__(self) -> str:
+        """Return comma+space separated str of items in curly brackets.
+
+        :returns: PEP 3140 string form of the dict data.
+        :rtype: str
+        """
+        body = ", ".join(f"{key}: {value}" for key, value in self.items())
+        return f"{{{body}}}"