[Python] Handle nullable dictionary values (#17605)

* fix nullable elements in maps

* update examples

* exclude values typed as Any

Author: changhc

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

@@ -693,14 +693,10 @@ public String getTypeDeclaration(Schema p) {
         if (ModelUtils.isArraySchema(p)) {
             ArraySchema ap = (ArraySchema) p;
             Schema inner = ap.getItems();
-            String innerDeclaration = getTypeDeclaration(inner);
-            if (inner.getNullable() != null && inner.getNullable()) {
-                innerDeclaration = "Optional[" + innerDeclaration + "]";
-            }
-            return getSchemaType(p) + "[" + innerDeclaration + "]";
+            return getSchemaType(p) + "[" + getCollectionItemTypeDeclaration(inner) + "]";
         } else if (ModelUtils.isMapSchema(p)) {
             Schema inner = ModelUtils.getAdditionalProperties(p);
-            return getSchemaType(p) + "[str, " + getTypeDeclaration(inner) + "]";
+            return getSchemaType(p) + "[str, " + getCollectionItemTypeDeclaration(inner) + "]";
         }
 
         String openAPIType = getSchemaType(p);
@@ -715,6 +711,14 @@ public String getTypeDeclaration(Schema p) {
         return toModelName(openAPIType);
     }
 
+    private String getCollectionItemTypeDeclaration(Schema inner) {
+        String innerDeclaration = getTypeDeclaration(inner);
+        if (Boolean.TRUE.equals(inner.getNullable())) {
+            innerDeclaration = "Optional[" + innerDeclaration + "]";
+        }
+        return innerDeclaration;
+    }
+
     @Override
     public String getSchemaType(Schema p) {
         String openAPIType = super.getSchemaType(p);
@@ -1758,7 +1762,7 @@ private PythonType arrayType(IJsonSchemaValidationProperties cp) {
 
         private PythonType collectionItemType(CodegenProperty itemCp) {
             PythonType itemPt = getType(itemCp);
-            if (itemCp != null && itemCp.isNullable) {
+            if (itemCp != null && !itemPt.type.equals("Any") && itemCp.isNullable) {
                 moduleImports.add("typing", "Optional");
                 PythonType opt = new PythonType("Optional");
                 opt.addTypeParam(itemPt);
@@ -1802,7 +1806,7 @@ private PythonType mapType(IJsonSchemaValidationProperties cp) {
             moduleImports.add("typing", "Dict");
             PythonType pt = new PythonType("Dict");
             pt.addTypeParam(new PythonType("str"));
-            pt.addTypeParam(getType(cp.getItems()));
+            pt.addTypeParam(collectionItemType(cp.getItems()));
             return pt;
         }
 

samples/openapi3/client/petstore/python-aiohttp/docs/NullableClass.md

@@ -16,8 +16,8 @@ Name | Type | Description | Notes
 **array_and_items_nullable_prop** | **List[Optional[object]]** |  | [optional] 
 **array_items_nullable** | **List[Optional[object]]** |  | [optional] 
 **object_nullable_prop** | **Dict[str, object]** |  | [optional] 
-**object_and_items_nullable_prop** | **Dict[str, object]** |  | [optional] 
-**object_items_nullable** | **Dict[str, object]** |  | [optional] 
+**object_and_items_nullable_prop** | **Dict[str, Optional[object]]** |  | [optional] 
+**object_items_nullable** | **Dict[str, Optional[object]]** |  | [optional] 
 
 ## Example
 

samples/openapi3/client/petstore/python-aiohttp/petstore_api/models/nullable_class.py

@@ -38,8 +38,8 @@ class NullableClass(BaseModel):
     array_and_items_nullable_prop: Optional[List[Optional[Dict[str, Any]]]] = None
     array_items_nullable: Optional[List[Optional[Dict[str, Any]]]] = None
     object_nullable_prop: Optional[Dict[str, Dict[str, Any]]] = None
-    object_and_items_nullable_prop: Optional[Dict[str, Dict[str, Any]]] = None
-    object_items_nullable: Optional[Dict[str, Dict[str, Any]]] = None
+    object_and_items_nullable_prop: Optional[Dict[str, Optional[Dict[str, Any]]]] = None
+    object_items_nullable: Optional[Dict[str, Optional[Dict[str, Any]]]] = None
     additional_properties: Dict[str, Any] = {}
     __properties: ClassVar[List[str]] = ["required_integer_prop", "integer_prop", "number_prop", "boolean_prop", "string_prop", "date_prop", "datetime_prop", "array_nullable_prop", "array_and_items_nullable_prop", "array_items_nullable", "object_nullable_prop", "object_and_items_nullable_prop", "object_items_nullable"]
 

samples/openapi3/client/petstore/python/docs/NullableClass.md

@@ -16,8 +16,8 @@ Name | Type | Description | Notes
 **array_and_items_nullable_prop** | **List[Optional[object]]** |  | [optional] 
 **array_items_nullable** | **List[Optional[object]]** |  | [optional] 
 **object_nullable_prop** | **Dict[str, object]** |  | [optional] 
-**object_and_items_nullable_prop** | **Dict[str, object]** |  | [optional] 
-**object_items_nullable** | **Dict[str, object]** |  | [optional] 
+**object_and_items_nullable_prop** | **Dict[str, Optional[object]]** |  | [optional] 
+**object_items_nullable** | **Dict[str, Optional[object]]** |  | [optional] 
 
 ## Example
 

samples/openapi3/client/petstore/python/petstore_api/models/nullable_class.py

@@ -38,8 +38,8 @@ class NullableClass(BaseModel):
     array_and_items_nullable_prop: Optional[List[Optional[Dict[str, Any]]]] = None
     array_items_nullable: Optional[List[Optional[Dict[str, Any]]]] = None
     object_nullable_prop: Optional[Dict[str, Dict[str, Any]]] = None
-    object_and_items_nullable_prop: Optional[Dict[str, Dict[str, Any]]] = None
-    object_items_nullable: Optional[Dict[str, Dict[str, Any]]] = None
+    object_and_items_nullable_prop: Optional[Dict[str, Optional[Dict[str, Any]]]] = None
+    object_items_nullable: Optional[Dict[str, Optional[Dict[str, Any]]]] = None
     additional_properties: Dict[str, Any] = {}
     __properties: ClassVar[List[str]] = ["required_integer_prop", "integer_prop", "number_prop", "boolean_prop", "string_prop", "date_prop", "datetime_prop", "array_nullable_prop", "array_and_items_nullable_prop", "array_items_nullable", "object_nullable_prop", "object_and_items_nullable_prop", "object_items_nullable"]