Bug - python client deserialization when attribute named self (#9006)

* fix by mapping outside of class

* tests

* regeneration and tests

* server

* INDENT

* a

* enable mapping

* Revert "server"

This reverts commit 6fc9712fb5.

* Samples regenerated

Co-authored-by: Justin Black <justin.a.black@gmail.com>

samples/openapi3/client/petstore/python/test/test_some_object_with_self_attr.py

@@ -0,0 +1,35 @@
+"""
+    OpenAPI Petstore
+
+    This spec is mainly for testing Petstore server and contains fake endpoints, models. Please do not use this for any other purpose. Special characters: \" \\  # noqa: E501
+
+    The version of the OpenAPI document: 1.0.0
+    Generated by: https://openapi-generator.tech
+"""
+
+
+import sys
+import unittest
+
+import petstore_api
+from petstore_api.model.some_object_with_self_attr import SomeObjectWithSelfAttr
+
+
+class TestSomeObjectWithSelfAttr(unittest.TestCase):
+    """SomeObjectWithSelfAttr unit test stubs"""
+
+    def setUp(self):
+        pass
+
+    def tearDown(self):
+        pass
+
+    def testSomeObjectWithSelfAttr(self):
+        """Test SomeObjectWithSelfAttr"""
+        kwargs = {"self": "this is a string", "_spec_property_naming": True}
+        model = SomeObjectWithSelfAttr(**kwargs)
+        assert model._self == "this is a string"
+
+
+if __name__ == '__main__':
+    unittest.main()