chore(python) update generator to 7.22

[cgoetz-inovex]

template diff upstream 7.20 to 7.22:

diff --git a/modules/openapi-generator/src/main/resources/python/README_onlypackage.mustache b/modules/openapi-generator/src/main/resources/python/README_onlypackage.mustache
index 430fb722f84..841f33428a2 100644
--- a/modules/openapi-generator/src/main/resources/python/README_onlypackage.mustache
+++ b/modules/openapi-generator/src/main/resources/python/README_onlypackage.mustache
@@ -39,7 +39,7 @@ To be able to use it, you will need these dependencies in your own package that
 * pem >= 19.3.0
 * pycryptodome >= 3.9.0
 {{/hasHttpSignatureMethods}}
-* pydantic >= 2
+* pydantic >= 2.11
 * typing-extensions >= 4.7.1
 
 ## Getting Started
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 aaa5b267a47..e414300cd09 100644
--- a/modules/openapi-generator/src/main/resources/python/api_client.mustache
+++ b/modules/openapi-generator/src/main/resources/python/api_client.mustache
@@ -61,6 +61,7 @@ class ApiClient:
         'date': datetime.date,
         'datetime': datetime.datetime,
         'decimal': decimal.Decimal,
+        'UUID': uuid.UUID,
         'object': object,
     }
     _pool = None
@@ -313,7 +314,7 @@ class ApiClient:
         response_text = None
         return_data = None
         try:
-            if response_type == "bytearray":
+            if response_type in ("bytearray", "bytes"):
                 return_data = response_data.data
             elif response_type == "file":
                 return_data = self.__deserialize_file(response_data)
@@ -378,28 +379,24 @@ class ApiClient:
             return obj.isoformat()
         elif isinstance(obj, decimal.Decimal):
             return str(obj)
-
         elif isinstance(obj, dict):
-            obj_dict = obj
+            return {
+                key: self.sanitize_for_serialization(val)
+                for key, val in obj.items()
+            }
+
+        # Convert model obj to dict except
+        # attributes `openapi_types`, `attribute_map`
+        # and attributes which value is not None.
+        # Convert attribute name to json key in
+        # model definition for request.
+        if hasattr(obj, 'to_dict') and callable(getattr(obj, 'to_dict')):
+            obj_dict = obj.to_dict()
         else:
-            # Convert model obj to dict except
-            # attributes `openapi_types`, `attribute_map`
-            # and attributes which value is not None.
-            # Convert attribute name to json key in
-            # model definition for request.
-            if hasattr(obj, 'to_dict') and callable(getattr(obj, 'to_dict')):
-                obj_dict = obj.to_dict()
-            else:
-                obj_dict = obj.__dict__
+            obj_dict = obj.__dict__
 
-        if isinstance(obj_dict, list):
-            # here we handle instances that can either be a list or something else, and only became a real list by calling to_dict()
-            return self.sanitize_for_serialization(obj_dict)
+        return self.sanitize_for_serialization(obj_dict)
 
-        return {
-            key: self.sanitize_for_serialization(val)
-            for key, val in obj_dict.items()
-        }
 
     def deserialize(self, response_text: str, response_type: str, content_type: Optional[str]):
         """Deserializes response into an object.
@@ -475,6 +472,8 @@ class ApiClient:
             return self.__deserialize_datetime(data)
         elif klass is decimal.Decimal:
             return decimal.Decimal(data)
+        elif klass is uuid.UUID:
+            return uuid.UUID(data)
         elif issubclass(klass, Enum):
             return self.__deserialize_enum(data, klass)
         else:
diff --git a/modules/openapi-generator/src/main/resources/python/asyncio/rest.mustache b/modules/openapi-generator/src/main/resources/python/asyncio/rest.mustache
index 474413e955e..6945dfd4fc9 100644
--- a/modules/openapi-generator/src/main/resources/python/asyncio/rest.mustache
+++ b/modules/openapi-generator/src/main/resources/python/asyncio/rest.mustache
@@ -156,6 +156,8 @@ class RESTClientObject:
             if re.search('json', headers['Content-Type'], re.IGNORECASE):
                 if body is not None:
                     body = json.dumps(body)
+                if body is None and post_params:
+                    body = json.dumps(dict(post_params))
                 args["data"] = body
             elif headers['Content-Type'] == 'application/x-www-form-urlencoded':
                 args["data"] = aiohttp.FormData(post_params)
diff --git a/modules/openapi-generator/src/main/resources/python/configuration.mustache b/modules/openapi-generator/src/main/resources/python/configuration.mustache
index 52fb8a940b6..4027fe59b15 100644
--- a/modules/openapi-generator/src/main/resources/python/configuration.mustache
+++ b/modules/openapi-generator/src/main/resources/python/configuration.mustache
@@ -1,5 +1,8 @@
 {{>partial_header}}
 
+{{#asyncio}}
+import aiohttp_retry
+{{/asyncio}}
 {{#async}}
 import base64
 {{/async}}
@@ -183,11 +186,16 @@ class Configuration:
       string values to replace variables in templated server configuration.
       The validation of enums is performed for variables with defined enum
       values before.
+    :param verify_ssl: bool - Set this to false to skip verifying SSL certificate
+      when calling API from https server.
     :param ssl_ca_cert: str - the path to a file of concatenated CA certificates
       in PEM format.
-{{#async}}
+{{#asyncio}}
     :param retries: int | aiohttp_retry.RetryOptionsBase - Retry configuration.
-{{/async}}
+{{/asyncio}}
+{{#httpx}}
+    :param retries: int - Retry configuration.
+{{/httpx}}
 {{^async}}
     :param retries: int | urllib3.util.retry.Retry - Retry configuration.
 {{/async}}
@@ -195,6 +203,16 @@ class Configuration:
       in PEM (str) or DER (bytes) format.
     :param cert_file: the path to a client certificate file, for mTLS.
     :param key_file: the path to a client key file, for mTLS.
+    :param assert_hostname: Set this to True/False to enable/disable SSL hostname verification.
+    :param tls_server_name: SSL/TLS Server Name Indication (SNI). Set this to the SNI value expected by the server.
+    :param connection_pool_maxsize: Connection pool max size. None in the constructor is coerced to 100 for async and cpu_count * 5 for sync.
+    :param proxy: Proxy URL.
+    :param proxy_headers: Proxy headers.
+    :param safe_chars_for_path_param: Safe characters for path parameter encoding.
+    :param client_side_validation: Enable client-side validation. Default True.
+    :param socket_options: Options to pass down to the underlying urllib3 socket.
+    :param datetime_format: Datetime format string for serialization.
+    :param date_format: Date format string for serialization.
 
 {{#hasAuthMethods}}
     :Example:
@@ -300,10 +318,29 @@ conf = {{{packageName}}}.Configuration(
         server_operation_variables: Optional[Dict[int, ServerVariablesT]]=None,
         ignore_operation_servers: bool=False,
         ssl_ca_cert: Optional[str]=None,
-        retries: Optional[Union[int, Any]] = None,
+{{#asyncio}}
+        retries: Optional[Union[int, aiohttp_retry.RetryOptionsBase]] = None,
+{{/asyncio}}
+{{#httpx}}
+        retries: Optional[int] = None,
+{{/httpx}}
+{{^async}}
+        retries: Optional[Union[int, urllib3.util.retry.Retry]] = None,
+{{/async}}
         ca_cert_data: Optional[Union[str, bytes]] = None,
         cert_file: Optional[str]=None,
         key_file: Optional[str]=None,
+        verify_ssl: bool=True,
+        assert_hostname: Optional[bool]=None,
+        tls_server_name: Optional[str]=None,
+        connection_pool_maxsize: Optional[int]=None,
+        proxy: Optional[str]=None,
+        proxy_headers: Optional[Any]=None,
+        safe_chars_for_path_param: str='',
+        client_side_validation: bool=True,
+        socket_options: Optional[Any]=None,
+        datetime_format: str="{{{datetimeFormat}}}",
+        date_format: str="{{{dateFormat}}}",
         *,
         debug: Optional[bool] = None,
     ) -> None:
@@ -382,7 +419,7 @@ conf = {{{packageName}}}.Configuration(
         """Debug switch
         """
 
-        self.verify_ssl = True
+        self.verify_ssl = verify_ssl
         """SSL/TLS verification
            Set this to false to skip verifying SSL certificate when calling API
            from https server.
@@ -400,54 +437,51 @@ conf = {{{packageName}}}.Configuration(
         self.key_file = key_file
         """client key file
         """
-        self.assert_hostname = None
+        self.assert_hostname = assert_hostname
         """Set this to True/False to enable/disable SSL hostname verification.
         """
-        self.tls_server_name = None
+        self.tls_server_name = tls_server_name
         """SSL/TLS Server Name Indication (SNI)
            Set this to the SNI value expected by the server.
         """
 
         {{#async}}
-        self.connection_pool_maxsize = 100
+        self.connection_pool_maxsize = connection_pool_maxsize if connection_pool_maxsize is not None else 100
         """This value is passed to the aiohttp to limit simultaneous connections.
-           Default values is 100, None means no-limit.
+           None in the constructor is coerced to default 100.
         """
         {{/async}}
         {{^async}}
-        self.connection_pool_maxsize = multiprocessing.cpu_count() * 5
+        self.connection_pool_maxsize = connection_pool_maxsize if connection_pool_maxsize is not None else multiprocessing.cpu_count() * 5
         """urllib3 connection pool's maximum number of connections saved
-           per pool. urllib3 uses 1 connection as default value, but this is
-           not the best value when you are making a lot of possibly parallel
-           requests to the same host, which is often the case here.
-           cpu_count * 5 is used as default value to increase performance.
+           per pool. None in the constructor is coerced to cpu_count * 5.
         """
         {{/async}}
 
-        self.proxy: Optional[str] = None
+        self.proxy = proxy
         """Proxy URL
         """
-        self.proxy_headers = None
+        self.proxy_headers = proxy_headers
         """Proxy headers
         """
-        self.safe_chars_for_path_param = ''
+        self.safe_chars_for_path_param = safe_chars_for_path_param
         """Safe chars for path_param
         """
         self.retries = retries
         """Retry configuration
         """
         # Enable client side validation
-        self.client_side_validation = True
+        self.client_side_validation = client_side_validation
 
-        self.socket_options = None
+        self.socket_options = socket_options
         """Options to pass down to the underlying urllib3 socket
         """
 
-        self.datetime_format = "{{{datetimeFormat}}}"
+        self.datetime_format = datetime_format
         """datetime format
         """
 
-        self.date_format = "{{{dateFormat}}}"
+        self.date_format = date_format
         """date format
         """
 
diff --git a/modules/openapi-generator/src/main/resources/python/github-workflow.mustache b/modules/openapi-generator/src/main/resources/python/github-workflow.mustache
index 5ca2c1d0099..f6f72ae6995 100644
--- a/modules/openapi-generator/src/main/resources/python/github-workflow.mustache
+++ b/modules/openapi-generator/src/main/resources/python/github-workflow.mustache
@@ -17,7 +17,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
+        python-version: ["3.10", "3.11", "3.12", "3.13", "3.14"]
 
     steps:
       - uses: actions/checkout@v4
diff --git a/modules/openapi-generator/src/main/resources/python/gitlab-ci.mustache b/modules/openapi-generator/src/main/resources/python/gitlab-ci.mustache
index f4bea123062..701ffbfd7e8 100644
--- a/modules/openapi-generator/src/main/resources/python/gitlab-ci.mustache
+++ b/modules/openapi-generator/src/main/resources/python/gitlab-ci.mustache
@@ -14,9 +14,6 @@ stages:
    - pip install -r test-requirements.txt
    - pytest --cov={{{packageName}}}
 
-pytest-3.9:
-  extends: .pytest
-  image: python:3.9-alpine
 pytest-3.10:
   extends: .pytest
   image: python:3.10-alpine
@@ -29,3 +26,6 @@ pytest-3.12:
 pytest-3.13:
   extends: .pytest
   image: python:3.13-alpine
+pytest-3.14:
+  extends: .pytest
+  image: python:3.14-alpine
diff --git a/modules/openapi-generator/src/main/resources/python/httpx/rest.mustache b/modules/openapi-generator/src/main/resources/python/httpx/rest.mustache
index 79a70e8815b..fc20b48351b 100644
--- a/modules/openapi-generator/src/main/resources/python/httpx/rest.mustache
+++ b/modules/openapi-generator/src/main/resources/python/httpx/rest.mustache
@@ -128,6 +128,8 @@ class RESTClientObject:
             if re.search('json', headers['Content-Type'], re.IGNORECASE):
                 if body is not None:
                     args["json"] = body
+                if body is None and post_params:
+                    args["json"] = dict(post_params)
             elif headers['Content-Type'] == 'application/x-www-form-urlencoded':  # noqa: E501
                 args["data"] = dict(post_params)
             elif headers['Content-Type'] == 'multipart/form-data':
diff --git a/modules/openapi-generator/src/main/resources/python/model_generic.mustache b/modules/openapi-generator/src/main/resources/python/model_generic.mustache
index 70804d448de..1b9d0f7d3fd 100644
--- a/modules/openapi-generator/src/main/resources/python/model_generic.mustache
+++ b/modules/openapi-generator/src/main/resources/python/model_generic.mustache
@@ -11,6 +11,7 @@ import json
 {{/vendorExtensions.x-py-model-imports}}
 from typing import Optional, Set
 from typing_extensions import Self
+from pydantic_core import to_jsonable_python
 
 {{#hasChildren}}
 {{#discriminator}}
@@ -52,6 +53,9 @@ class {{classname}}({{#parent}}{{{.}}}{{/parent}}{{^parent}}BaseModel{{/parent}}
 
         {{/isNullable}}
         {{/required}}
+        if not isinstance(value, str):
+            value = str(value)
+
         if not re.match(r"{{{.}}}", value{{#vendorExtensions.x-modifiers}} ,re.{{{.}}}{{/vendorExtensions.x-modifiers}}):
             raise ValueError(r"must validate the regular expression {{{vendorExtensions.x-pattern}}}")
         return value
@@ -94,7 +98,8 @@ class {{classname}}({{#parent}}{{{.}}}{{/parent}}{{^parent}}BaseModel{{/parent}}
 {{/vars}}
 
     model_config = ConfigDict(
-        populate_by_name=True,
+        validate_by_name=True,
+        validate_by_alias=True,
         validate_assignment=True,
         protected_namespaces=(),
     )
@@ -127,8 +132,7 @@ class {{classname}}({{#parent}}{{{.}}}{{/parent}}{{^parent}}BaseModel{{/parent}}
 
     def to_json(self) -> str:
         """Returns the JSON representation of the model using alias"""
-        # TODO: pydantic v2: use .model_dump_json(by_alias=True, exclude_unset=True) instead
-        return json.dumps(self.to_dict())
+        return json.dumps(to_jsonable_python(self.to_dict()))
 
     @classmethod
     def from_json(cls, json_str: str) -> Optional[{{^hasChildren}}Self{{/hasChildren}}{{#hasChildren}}{{#discriminator}}Union[{{#mappedModels}}{{{modelName}}}{{^-last}}, {{/-last}}{{/mappedModels}}]{{/discriminator}}{{^discriminator}}Self{{/discriminator}}{{/hasChildren}}]:
@@ -181,7 +185,21 @@ class {{classname}}({{#parent}}{{{.}}}{{/parent}}{{^parent}}BaseModel{{/parent}}
             _dict['{{{baseName}}}'] = _items
         {{/items.items.isPrimitiveType}}
         {{/items.isArray}}
+        {{#items.isMap}}
+        {{^items.items.isPrimitiveType}}
+        # override the default output from pydantic by calling `to_dict()` of each item in {{{name}}} (list of dict)
+        _items = []
+        if self.{{{name}}}:
+            for _item_{{{name}}} in self.{{{name}}}:
+                if _item_{{{name}}}:
+                    _items.append(
+                         {_inner_key: _inner_value.to_dict() for _inner_key, _inner_value in _item_{{{name}}}.items()}
+                    )
+            _dict['{{{baseName}}}'] = _items
+        {{/items.items.isPrimitiveType}}
+        {{/items.isMap}}
         {{^items.isArray}}
+        {{^items.isMap}}
         {{^items.isPrimitiveType}}
         {{^items.isEnumOrRef}}
         # override the default output from pydantic by calling `to_dict()` of each item in {{{name}}} (list)
@@ -193,6 +211,7 @@ class {{classname}}({{#parent}}{{{.}}}{{/parent}}{{^parent}}BaseModel{{/parent}}
             _dict['{{{baseName}}}'] = _items
         {{/items.isEnumOrRef}}
         {{/items.isPrimitiveType}}
+        {{/items.isMap}}
         {{/items.isArray}}
         {{/isArray}}
         {{#isMap}}
@@ -209,6 +228,20 @@ class {{classname}}({{#parent}}{{{.}}}{{/parent}}{{^parent}}BaseModel{{/parent}}
             _dict['{{{baseName}}}'] = _field_dict_of_array
         {{/items.items.isPrimitiveType}}
         {{/items.isArray}}
+        {{#items.isMap}}
+        {{^items.items.isPrimitiveType}}
+        # override the default output from pydantic by calling `to_dict()` of each value in {{{name}}} (dict of dict)
+        _field_dict_of_dict = {}
+        if self.{{{name}}}:
+            for _key_{{{name}}}, _value_{{{name}}} in self.{{{name}}}.items():
+                if _value_{{{name}}} is not None:
+                    _field_dict_of_dict[_key_{{{name}}}] = {
+                        _key: _value.to_dict() for _key, _value in _value_{{{name}}}.items()
+                    }
+            _dict['{{{baseName}}}'] = _field_dict_of_dict
+        {{/items.items.isPrimitiveType}}
+        {{/items.isMap}}
+        {{^items.isMap}}
         {{^items.isArray}}
         {{^items.isPrimitiveType}}
         {{^items.isEnumOrRef}}
@@ -222,6 +255,7 @@ class {{classname}}({{#parent}}{{{.}}}{{/parent}}{{^parent}}BaseModel{{/parent}}
         {{/items.isEnumOrRef}}
         {{/items.isPrimitiveType}}
         {{/items.isArray}}
+        {{/items.isMap}}
         {{/isMap}}
         {{/isContainer}}
         {{^isContainer}}
@@ -292,6 +326,7 @@ class {{classname}}({{#parent}}{{{.}}}{{/parent}}{{^parent}}BaseModel{{/parent}}
             {{#allVars}}
             {{#isContainer}}
             {{#isArray}}
+            {{#items.isContainer}}
             {{#items.isArray}}
             {{#items.items.isPrimitiveType}}
             "{{{baseName}}}": obj.get("{{{baseName}}}"){{^-last}},{{/-last}}
@@ -303,7 +338,19 @@ class {{classname}}({{#parent}}{{{.}}}{{/parent}}{{^parent}}BaseModel{{/parent}}
                 ] if obj.get("{{{baseName}}}") is not None else None{{^-last}},{{/-last}}
             {{/items.items.isPrimitiveType}}
             {{/items.isArray}}
-            {{^items.isArray}}
+            {{#items.isMap}}
+            {{#items.items.isPrimitiveType}}
+            "{{{baseName}}}": obj.get("{{{baseName}}}"){{^-last}},{{/-last}}
+            {{/items.items.isPrimitiveType}}
+            {{^items.items.isPrimitiveType}}
+            "{{{baseName}}}": [
+                    {_inner_key: {{{items.items.dataType}}}.from_dict(_inner_value) for _inner_key, _inner_value in _item.items()}
+                    for _item in obj["{{{baseName}}}"]
+                ] if obj.get("{{{baseName}}}") is not None else None{{^-last}},{{/-last}}
+            {{/items.items.isPrimitiveType}}
+            {{/items.isMap}}
+            {{/items.isContainer}}
+            {{^items.isContainer}}
             {{^items.isPrimitiveType}}
             {{#items.isEnumOrRef}}
             "{{{baseName}}}": obj.get("{{{baseName}}}"){{^-last}},{{/-last}}
@@ -315,7 +362,7 @@ class {{classname}}({{#parent}}{{{.}}}{{/parent}}{{^parent}}BaseModel{{/parent}}
             {{#items.isPrimitiveType}}
             "{{{baseName}}}": obj.get("{{{baseName}}}"){{^-last}},{{/-last}}
             {{/items.isPrimitiveType}}
-            {{/items.isArray}}
+            {{/items.isContainer}}
             {{/isArray}}
             {{#isMap}}
             {{^items.isPrimitiveType}}
@@ -330,20 +377,18 @@ class {{classname}}({{#parent}}{{{.}}}{{/parent}}{{^parent}}BaseModel{{/parent}}
                     if _v is not None
                     else None
                 )
-                for _k, _v in obj.get("{{{baseName}}}").items()
+                for _k, _v in obj["{{{baseName}}}"].items()
             )
             if obj.get("{{{baseName}}}") is not None
             else None{{^-last}},{{/-last}}
             {{/items.isMap}}
             {{#items.isArray}}
-            "{{{baseName}}}": dict(
-                (_k,
-                        [{{{items.items.dataType}}}.from_dict(_item) for _item in _v]
-                        if _v is not None
-                        else None
-                )
-                for _k, _v in obj.get("{{{baseName}}}", {}).items()
-            ){{^-last}},{{/-last}}
+            "{{{baseName}}}": {
+                _k: [{{{items.items.dataType}}}.from_dict(_item) for _item in _v] if _v is not None else None
+                for _k, _v in obj["{{{baseName}}}"].items()
+            }
+            if obj.get("{{{baseName}}}") is not None
+            else None{{^-last}},{{/-last}}
             {{/items.isArray}}
             {{/items.isContainer}}
             {{^items.isContainer}}
diff --git a/modules/openapi-generator/src/main/resources/python/pyproject.mustache b/modules/openapi-generator/src/main/resources/python/pyproject.mustache
index 7eed997a3f4..315d750bacd 100644
--- a/modules/openapi-generator/src/main/resources/python/pyproject.mustache
+++ b/modules/openapi-generator/src/main/resources/python/pyproject.mustache
@@ -32,7 +32,7 @@ keywords = ["OpenAPI", "OpenAPI-Generator", "{{{appName}}}"]
 include = ["{{packageName}}/py.typed"]
 
 [tool.poetry.dependencies]
-python = "^3.9"
+python = "^3.10"
 {{^async}}
 urllib3 = ">= 2.1.0, < 3.0.0"
 {{/async}}
@@ -51,7 +51,7 @@ tornado = ">=4.2, <5"
 pem = ">= 19.3.0"
 pycryptodome = ">= 3.9.0"
 {{/hasHttpSignatureMethods}}
-pydantic = ">= 2"
+pydantic = ">= 2.11"
 typing-extensions = ">= 4.7.1"
 {{#lazyImports}}
 lazy-imports = ">= 1, < 2"
@@ -79,7 +79,7 @@ dependencies = [
   "pem (>=19.3.0)",
   "pycryptodome (>=3.9.0)",
 {{/hasHttpSignatureMethods}}
-  "pydantic (>=2)",
+  "pydantic (>=2.11)",
   "typing-extensions (>=4.7.1)",
 {{#lazyImports}}
   "lazy-imports (>=1,<2)"
@@ -110,8 +110,14 @@ mypy = ">= 1.5"
 
 
 [build-system]
+{{#hatchling}}
+requires = ["hatchling"]
+build-backend = "hatchling.build"
+{{/hatchling}}
+{{^hatchling}}
 requires = ["setuptools"]
 build-backend = "setuptools.build_meta"
+{{/hatchling}}
 
 [tool.pylint.'MESSAGES CONTROL']
 extension-pkg-whitelist = "pydantic"
diff --git a/modules/openapi-generator/src/main/resources/python/requirements.mustache b/modules/openapi-generator/src/main/resources/python/requirements.mustache
index aef16e4cb7a..2bd27cba9b8 100644
--- a/modules/openapi-generator/src/main/resources/python/requirements.mustache
+++ b/modules/openapi-generator/src/main/resources/python/requirements.mustache
@@ -16,7 +16,7 @@ tornado = ">= 4.2, < 5"
 pem >= 19.3.0
 pycryptodome >= 3.9.0
 {{/hasHttpSignatureMethods}}
-pydantic >= 2
+pydantic >= 2.11
 typing-extensions >= 4.7.1
 {{#lazyImports}}
 lazy-imports >= 1, < 2
diff --git a/modules/openapi-generator/src/main/resources/python/setup.mustache b/modules/openapi-generator/src/main/resources/python/setup.mustache
index 7304d0e8828..9506fd9c825 100644
--- a/modules/openapi-generator/src/main/resources/python/setup.mustache
+++ b/modules/openapi-generator/src/main/resources/python/setup.mustache
@@ -10,7 +10,7 @@ from setuptools import setup, find_packages  # noqa: H301
 # http://pypi.python.org/pypi/setuptools
 NAME = "{{{projectName}}}"
 VERSION = "{{packageVersion}}"
-PYTHON_REQUIRES = ">= 3.9"
+PYTHON_REQUIRES = ">= 3.10"
 REQUIRES = [
 {{^async}}
     "urllib3 >= 2.1.0, < 3.0.0",
@@ -30,7 +30,7 @@ REQUIRES = [
     "pem >= 19.3.0",
     "pycryptodome >= 3.9.0",
 {{/hasHttpSignatureMethods}}
-    "pydantic >= 2",
+    "pydantic >= 2.11",
     "typing-extensions >= 4.7.1",
 {{#lazyImports}}
     "lazy-imports >= 1, < 2",
diff --git a/modules/openapi-generator/src/main/resources/python/tornado/rest.mustache b/modules/openapi-generator/src/main/resources/python/tornado/rest.mustache
index 401f6a0b351..713defa5542 100644
--- a/modules/openapi-generator/src/main/resources/python/tornado/rest.mustache
+++ b/modules/openapi-generator/src/main/resources/python/tornado/rest.mustache
@@ -122,6 +122,8 @@ class RESTClientObject:
             if re.search('json', headers['Content-Type'], re.IGNORECASE):
                 if body:
                     body = json.dumps(body)
+                if body is None and post_params:
+                    body = json.dumps(dict(post_params))
                 request.body = body
             elif headers['Content-Type'] == 'application/x-www-form-urlencoded':
                 request.body = urlencode(post_params)
diff --git a/modules/openapi-generator/src/main/resources/python/travis.mustache b/modules/openapi-generator/src/main/resources/python/travis.mustache
index fd436438592..983251a4640 100644
--- a/modules/openapi-generator/src/main/resources/python/travis.mustache
+++ b/modules/openapi-generator/src/main/resources/python/travis.mustache
@@ -1,13 +1,13 @@
 # ref: https://docs.travis-ci.com/user/languages/python
 language: python
 python:
-  - "3.9"
   - "3.10"
   - "3.11"
   - "3.12"
   - "3.13"
+  - "3.14"
   # uncomment the following if needed
-  #- "3.13-dev"  # 3.13 development branch
+  #- "3.14-dev"  # 3.14 development branch
   #- "nightly"  # nightly build
 # command to install dependencies
 install: