Fixes low spec version bug

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

@@ -2759,14 +2759,14 @@ public String defaultTemplatingEngine() {
     public void preprocessOpenAPI(OpenAPI openAPI) {
         String originalSpecVersion;
         String xOriginalSwaggerVersion = "x-original-swagger-version";
-        if (openAPI.getExtensions() != null && !openAPI.getExtensions().isEmpty() && openAPI.getExtensions().containsValue(xOriginalSwaggerVersion)) {
+        if (openAPI.getExtensions() != null && !openAPI.getExtensions().isEmpty() && openAPI.getExtensions().containsKey(xOriginalSwaggerVersion)) {
             originalSpecVersion = (String) openAPI.getExtensions().get(xOriginalSwaggerVersion);
         } else {
             originalSpecVersion = openAPI.getOpenapi();
         }
         Integer specMajorVersion = Integer.parseInt(originalSpecVersion.substring(0, 1));
         if (specMajorVersion < 3) {
-            throw new RuntimeException("Your spec version of "+originalSpecVersion+" is too low. python-experimental only works with specs with version >= 3.X.X. Please use a tool like Swagger Editor or Swagger Converter to convert your spec to v3");
+            throw new RuntimeException("Your spec version of "+originalSpecVersion+" is too low. " + getName() + " only works with specs with version >= 3.X.X. Please use a tool like Swagger Editor or Swagger Converter to convert your spec to v3");
         }
     }
 

modules/openapi-json-schema-generator/src/test/java/org/openapitools/codegen/python/PythonClientTest.java

@@ -59,8 +59,8 @@ public void testRecursiveExampleValueWithCycle() throws Exception {
         Assert.assertEquals(exampleValue.trim(), expectedValue.trim());
     }
 
-    @Test
-    public void testSpecWithTooLowVersionThrowsException() throws RuntimeException {
+    @Test(expectedExceptions = RuntimeException.class)
+    public void testSpecWithTooLowVersionThrowsException() {
         final OpenAPI openAPI = TestUtils.parseSpec("src/test/resources/2_0/petstore.yaml");
         final PythonClientCodegen codegen = new PythonClientCodegen();
         codegen.preprocessOpenAPI(openAPI);