[Python-experimental] JSON schema 'null' type should be modeled as 'none_type'

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/PythonClientCodegen.java

@@ -143,6 +143,7 @@ public PythonClientCodegen() {
         // map uuid to string for the time being
         typeMapping.put("UUID", "str");
         typeMapping.put("URI", "str");
+        typeMapping.put("null", "none_type");
 
         // from https://docs.python.org/3/reference/lexical_analysis.html#keywords
         setReservedWordsLowerCase(

modules/openapi-generator/src/test/resources/3_0/petstore-with-fake-endpoints-models-for-testing-with-http-signature.yaml

@@ -1855,6 +1855,7 @@ components:
           - $ref: '#/components/schemas/banana'
     fruitReq:
        oneOf:
+          - type: 'null'
           - $ref: '#/components/schemas/appleReq'
           - $ref: '#/components/schemas/bananaReq'
     appleReq:

samples/openapi3/client/petstore/go-experimental/go-petstore/api/openapi.yaml

@@ -1973,6 +1973,7 @@ components:
           type: string
     fruitReq:
       oneOf:
+      - type: "null"
       - $ref: '#/components/schemas/appleReq'
       - $ref: '#/components/schemas/bananaReq'
       x-one-of-name: FruitReq

samples/openapi3/client/petstore/go-experimental/go-petstore/model_fruit_req.go

@@ -37,6 +37,12 @@ func (s *FruitReq) UnmarshalJSON(src []byte) error {
 		s.FruitReqInterface = unmarshaledBananaReq
 		return nil
 	}
+	var unmarshaledNull *Null = &Null{}
+	err = json.Unmarshal(src, unmarshaledNull)
+	if err == nil {
+		s.FruitReqInterface = unmarshaledNull
+		return nil
+	}
 	return fmt.Errorf("No oneOf model could be deserialized from payload: %s", string(src))
 }
 type NullableFruitReq struct {

samples/openapi3/client/petstore/python-experimental/petstore_api/models/fruit_req.py

@@ -39,6 +39,11 @@
 except ImportError:
     banana_req = sys.modules[
         'petstore_api.models.banana_req']
+try:
+    from petstore_api.models import none_type
+except ImportError:
+    none_type = sys.modules[
+        'petstore_api.models.none_type']
 
 
 class FruitReq(ModelComposed):
@@ -196,5 +201,6 @@ def _composed_schemas():
           'oneOf': [
               apple_req.AppleReq,
               banana_req.BananaReq,
+              none_type,
           ],
         }