[Python] deserialize enum json response (fix #17789) (#17791)

* deserialize enum json response (python)

* adapt python samples: adding enum deserialization

* add echo test for enum json response deserialization (python)

* update samples

samples/client/echo_api/java/feign-gson/api/openapi.yaml

@@ -547,6 +547,28 @@ paths:
       - body
       x-content-type: application/json
       x-accepts: text/plain
+  /echo/body/string_enum:
+    post:
+      description: Test string enum response body
+      operationId: test/echo/body/string_enum
+      requestBody:
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/schemas/StringEnumRef'
+        description: String enum
+      responses:
+        "200":
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/StringEnumRef'
+          description: Successful operation
+      summary: Test string enum response body
+      tags:
+      - body
+      x-content-type: application/json
+      x-accepts: application/json
   /binary/gif:
     post:
       description: Test binary (gif) response body

samples/client/echo_api/java/feign-gson/src/main/java/org/openapitools/client/api/BodyApi.java

@@ -6,6 +6,7 @@ import org.openapitools.client.model.ApiResponse;
 
 import java.io.File;
 import org.openapitools.client.model.Pet;
+import org.openapitools.client.model.StringEnumRef;
 import org.openapitools.client.model.Tag;
 
 import java.util.ArrayList;
@@ -246,6 +247,35 @@ public interface BodyApi extends ApiClient.Api {
 
 
 
+  /**
+   * Test string enum response body
+   * Test string enum response body
+   * @param body String enum (optional)
+   * @return StringEnumRef
+   */
+  @RequestLine("POST /echo/body/string_enum")
+  @Headers({
+    "Content-Type: application/json",
+    "Accept: application/json",
+  })
+  StringEnumRef testEchoBodyStringEnum(String body);
+
+  /**
+   * Test string enum response body
+   * Similar to <code>testEchoBodyStringEnum</code> but it also returns the http response headers .
+   * Test string enum response body
+   * @param body String enum (optional)
+   * @return A ApiResponse that wraps the response boyd and the http headers.
+   */
+  @RequestLine("POST /echo/body/string_enum")
+  @Headers({
+    "Content-Type: application/json",
+    "Accept: application/json",
+  })
+  ApiResponse<StringEnumRef> testEchoBodyStringEnumWithHttpInfo(String body);
+
+
+
   /**
    * Test empty json (request body)
    * Test empty json (request body)