diff --git a/modules/openapi-generator/src/main/resources/python/api_client.mustache b/modules/openapi-generator/src/main/resources/python/api_client.mustache
index c7d4a6d700f..aad33bcc06c 100644
--- a/modules/openapi-generator/src/main/resources/python/api_client.mustache
+++ b/modules/openapi-generator/src/main/resources/python/api_client.mustache
@@ -5,6 +5,7 @@
 import datetime
 from dateutil.parser import parse
 from enum import Enum
+import decimal
 import json
 import mimetypes
 import os
@@ -59,6 +60,7 @@ class ApiClient:
         'bool': bool,
         'date': datetime.date,
         'datetime': datetime.datetime,
+        'decimal': decimal.Decimal,
         'object': object,
     }
     _pool = None
@@ -346,6 +348,7 @@ class ApiClient:
         If obj is str, int, long, float, bool, return directly.
         If obj is datetime.datetime, datetime.date
             convert to string in iso8601 format.
+        If obj is decimal.Decimal return string representation.
         If obj is list, sanitize each element in the list.
         If obj is dict, return the dict.
         If obj is OpenAPI model, return the properties dict.
@@ -371,6 +374,8 @@ class ApiClient:
             )
         elif isinstance(obj, (datetime.datetime, datetime.date)):
             return obj.isoformat()
+        elif isinstance(obj, decimal.Decimal):
+            return str(obj)
 
         elif isinstance(obj, dict):
             obj_dict = obj
@@ -462,6 +467,8 @@ class ApiClient:
             return self.__deserialize_date(data)
         elif klass == datetime.datetime:
             return self.__deserialize_datetime(data)
+        elif klass == decimal.Decimal:
+            return decimal.Decimal(data)
         elif issubclass(klass, Enum):
             return self.__deserialize_enum(data, klass)
         else:
diff --git a/samples/client/echo_api/python-disallowAdditionalPropertiesIfNotPresent/openapi_client/api_client.py b/samples/client/echo_api/python-disallowAdditionalPropertiesIfNotPresent/openapi_client/api_client.py
index feef534a2f2..c6fa28de319 100644
--- a/samples/client/echo_api/python-disallowAdditionalPropertiesIfNotPresent/openapi_client/api_client.py
+++ b/samples/client/echo_api/python-disallowAdditionalPropertiesIfNotPresent/openapi_client/api_client.py
@@ -16,6 +16,7 @@
 import datetime
 from dateutil.parser import parse
 from enum import Enum
+import decimal
 import json
 import mimetypes
 import os
@@ -67,6 +68,7 @@ class ApiClient:
         'bool': bool,
         'date': datetime.date,
         'datetime': datetime.datetime,
+        'decimal': decimal.Decimal,
         'object': object,
     }
     _pool = None
@@ -339,6 +341,7 @@ class ApiClient:
         If obj is str, int, long, float, bool, return directly.
         If obj is datetime.datetime, datetime.date
             convert to string in iso8601 format.
+        If obj is decimal.Decimal return string representation.
         If obj is list, sanitize each element in the list.
         If obj is dict, return the dict.
         If obj is OpenAPI model, return the properties dict.
@@ -364,6 +367,8 @@ class ApiClient:
             )
         elif isinstance(obj, (datetime.datetime, datetime.date)):
             return obj.isoformat()
+        elif isinstance(obj, decimal.Decimal):
+            return str(obj)
 
         elif isinstance(obj, dict):
             obj_dict = obj
@@ -455,6 +460,8 @@ class ApiClient:
             return self.__deserialize_date(data)
         elif klass == datetime.datetime:
             return self.__deserialize_datetime(data)
+        elif klass == decimal.Decimal:
+            return decimal.Decimal(data)
         elif issubclass(klass, Enum):
             return self.__deserialize_enum(data, klass)
         else:
diff --git a/samples/client/echo_api/python/openapi_client/api_client.py b/samples/client/echo_api/python/openapi_client/api_client.py
index feef534a2f2..c6fa28de319 100644
--- a/samples/client/echo_api/python/openapi_client/api_client.py
+++ b/samples/client/echo_api/python/openapi_client/api_client.py
@@ -16,6 +16,7 @@
 import datetime
 from dateutil.parser import parse
 from enum import Enum
+import decimal
 import json
 import mimetypes
 import os
@@ -67,6 +68,7 @@ class ApiClient:
         'bool': bool,
         'date': datetime.date,
         'datetime': datetime.datetime,
+        'decimal': decimal.Decimal,
         'object': object,
     }
     _pool = None
@@ -339,6 +341,7 @@ class ApiClient:
         If obj is str, int, long, float, bool, return directly.
         If obj is datetime.datetime, datetime.date
             convert to string in iso8601 format.
+        If obj is decimal.Decimal return string representation.
         If obj is list, sanitize each element in the list.
         If obj is dict, return the dict.
         If obj is OpenAPI model, return the properties dict.
@@ -364,6 +367,8 @@ class ApiClient:
             )
         elif isinstance(obj, (datetime.datetime, datetime.date)):
             return obj.isoformat()
+        elif isinstance(obj, decimal.Decimal):
+            return str(obj)
 
         elif isinstance(obj, dict):
             obj_dict = obj
@@ -455,6 +460,8 @@ class ApiClient:
             return self.__deserialize_date(data)
         elif klass == datetime.datetime:
             return self.__deserialize_datetime(data)
+        elif klass == decimal.Decimal:
+            return decimal.Decimal(data)
         elif issubclass(klass, Enum):
             return self.__deserialize_enum(data, klass)
         else:
diff --git a/samples/openapi3/client/petstore/python-aiohttp/petstore_api/api_client.py b/samples/openapi3/client/petstore/python-aiohttp/petstore_api/api_client.py
index 302e5dac53c..db57dd1827b 100644
--- a/samples/openapi3/client/petstore/python-aiohttp/petstore_api/api_client.py
+++ b/samples/openapi3/client/petstore/python-aiohttp/petstore_api/api_client.py
@@ -15,6 +15,7 @@
 import datetime
 from dateutil.parser import parse
 from enum import Enum
+import decimal
 import json
 import mimetypes
 import os
@@ -66,6 +67,7 @@ class ApiClient:
         'bool': bool,
         'date': datetime.date,
         'datetime': datetime.datetime,
+        'decimal': decimal.Decimal,
         'object': object,
     }
     _pool = None
@@ -341,6 +343,7 @@ class ApiClient:
         If obj is str, int, long, float, bool, return directly.
         If obj is datetime.datetime, datetime.date
             convert to string in iso8601 format.
+        If obj is decimal.Decimal return string representation.
         If obj is list, sanitize each element in the list.
         If obj is dict, return the dict.
         If obj is OpenAPI model, return the properties dict.
@@ -366,6 +369,8 @@ class ApiClient:
             )
         elif isinstance(obj, (datetime.datetime, datetime.date)):
             return obj.isoformat()
+        elif isinstance(obj, decimal.Decimal):
+            return str(obj)
 
         elif isinstance(obj, dict):
             obj_dict = obj
@@ -457,6 +462,8 @@ class ApiClient:
             return self.__deserialize_date(data)
         elif klass == datetime.datetime:
             return self.__deserialize_datetime(data)
+        elif klass == decimal.Decimal:
+            return decimal.Decimal(data)
         elif issubclass(klass, Enum):
             return self.__deserialize_enum(data, klass)
         else:
diff --git a/samples/openapi3/client/petstore/python/petstore_api/api_client.py b/samples/openapi3/client/petstore/python/petstore_api/api_client.py
index 9ab0756d53b..cb831d0de81 100755
--- a/samples/openapi3/client/petstore/python/petstore_api/api_client.py
+++ b/samples/openapi3/client/petstore/python/petstore_api/api_client.py
@@ -15,6 +15,7 @@
 import datetime
 from dateutil.parser import parse
 from enum import Enum
+import decimal
 import json
 import mimetypes
 import os
@@ -66,6 +67,7 @@ class ApiClient:
         'bool': bool,
         'date': datetime.date,
         'datetime': datetime.datetime,
+        'decimal': decimal.Decimal,
         'object': object,
     }
     _pool = None
@@ -338,6 +340,7 @@ class ApiClient:
         If obj is str, int, long, float, bool, return directly.
         If obj is datetime.datetime, datetime.date
             convert to string in iso8601 format.
+        If obj is decimal.Decimal return string representation.
         If obj is list, sanitize each element in the list.
         If obj is dict, return the dict.
         If obj is OpenAPI model, return the properties dict.
@@ -363,6 +366,8 @@ class ApiClient:
             )
         elif isinstance(obj, (datetime.datetime, datetime.date)):
             return obj.isoformat()
+        elif isinstance(obj, decimal.Decimal):
+            return str(obj)
 
         elif isinstance(obj, dict):
             obj_dict = obj
@@ -454,6 +459,8 @@ class ApiClient:
             return self.__deserialize_date(data)
         elif klass == datetime.datetime:
             return self.__deserialize_datetime(data)
+        elif klass == decimal.Decimal:
+            return decimal.Decimal(data)
         elif issubclass(klass, Enum):
             return self.__deserialize_enum(data, klass)
         else:
diff --git a/samples/openapi3/client/petstore/python/tests/test_api_client.py b/samples/openapi3/client/petstore/python/tests/test_api_client.py
index e80bc135296..b444f326c67 100644
--- a/samples/openapi3/client/petstore/python/tests/test_api_client.py
+++ b/samples/openapi3/client/petstore/python/tests/test_api_client.py
@@ -10,6 +10,7 @@ $ pytest
 """
 
 import unittest
+from decimal import Decimal
 from enum import Enum
 
 from dateutil.parser import parse
@@ -180,6 +181,11 @@ class ApiClientTests(unittest.TestCase):
         result = self.api_client.sanitize_for_serialization(data)
         self.assertEqual(result, "1997-07-16T19:20:30.450000+01:00")
 
+    def test_sanitize_for_serialization_decimal(self):
+        data = Decimal("1.0")
+        result = self.api_client.sanitize_for_serialization(data)
+        self.assertEquals(result, "1.0")
+
     def test_sanitize_for_serialization_list_enum(self):
         class EnumSerialization(int, Enum):
             NUMBER_0 = 0
diff --git a/samples/openapi3/client/petstore/python/tests/test_deserialization.py b/samples/openapi3/client/petstore/python/tests/test_deserialization.py
index 8fd654e4bb7..11b2955015a 100644
--- a/samples/openapi3/client/petstore/python/tests/test_deserialization.py
+++ b/samples/openapi3/client/petstore/python/tests/test_deserialization.py
@@ -14,6 +14,7 @@ import os
 import time
 import unittest
 import datetime
+from decimal import Decimal
 
 import pytest as pytest
 
@@ -130,6 +131,15 @@ class DeserializationTests(unittest.TestCase):
         deserialized = self.deserialize(response, "datetime", 'application/json')
         self.assertTrue(isinstance(deserialized, datetime.datetime))
 
+    def test_deserialize_decimal(self):
+        """ deserialize decimal """
+        data = 1.1
+        response = json.dumps(data)
+
+        deserialized = self.deserialize(response, "decimal", 'application/json')
+        self.assertTrue(isinstance(deserialized, Decimal))
+        self.assertEqual(deserialized, Decimal(1.1))
+
     def test_deserialize_pet(self):
         """ deserialize pet """
         data = {