fix python namespace package folders

Author: tc-imba

src/main/java/io/swagger/codegen/v3/generators/python/PythonClientCodegen.java

@@ -201,16 +201,18 @@ public void processOpts() {
             setPackageUrl((String) additionalProperties.get(PACKAGE_URL));
         }
 
+        final String packageFolder = packageName.replace('.', File.separatorChar);
+
         supportingFiles.add(new SupportingFile("README.mustache", "", "README.md"));
 
         supportingFiles.add(new SupportingFile("tox.mustache", "", "tox.ini"));
         supportingFiles.add(new SupportingFile("test-requirements.mustache", "", "test-requirements.txt"));
         supportingFiles.add(new SupportingFile("requirements.mustache", "", "requirements.txt"));
 
-        supportingFiles.add(new SupportingFile("configuration.mustache", packageName, "configuration.py"));
-        supportingFiles.add(new SupportingFile("__init__package.mustache", packageName, "__init__.py"));
-        supportingFiles.add(new SupportingFile("__init__model.mustache", packageName + File.separatorChar + modelPackage, "__init__.py"));
-        supportingFiles.add(new SupportingFile("__init__api.mustache", packageName + File.separatorChar + apiPackage, "__init__.py"));
+        supportingFiles.add(new SupportingFile("configuration.mustache", packageFolder, "configuration.py"));
+        supportingFiles.add(new SupportingFile("__init__package.mustache", packageFolder, "__init__.py"));
+        supportingFiles.add(new SupportingFile("__init__model.mustache", packageFolder + File.separatorChar + modelPackage, "__init__.py"));
+        supportingFiles.add(new SupportingFile("__init__api.mustache", packageFolder + File.separatorChar + apiPackage, "__init__.py"));
 
         if(Boolean.FALSE.equals(excludeTests)) {
             supportingFiles.add(new SupportingFile("__init__test.mustache", testFolder, "__init__.py"));
@@ -219,16 +221,16 @@ public void processOpts() {
         supportingFiles.add(new SupportingFile("gitignore.mustache", "", ".gitignore"));
         supportingFiles.add(new SupportingFile("travis.mustache", "", ".travis.yml"));
         supportingFiles.add(new SupportingFile("setup.mustache", "", "setup.py"));
-        supportingFiles.add(new SupportingFile("api_client.mustache", packageName, "api_client.py"));
+        supportingFiles.add(new SupportingFile("api_client.mustache", packageFolder, "api_client.py"));
 
         if ("asyncio".equals(getLibrary())) {
-            supportingFiles.add(new SupportingFile("asyncio/rest.mustache", packageName, "rest.py"));
+            supportingFiles.add(new SupportingFile("asyncio/rest.mustache", packageFolder, "rest.py"));
             additionalProperties.put("asyncio", "true");
         } else if ("tornado".equals(getLibrary())) {
-            supportingFiles.add(new SupportingFile("tornado/rest.mustache", packageName, "rest.py"));
+            supportingFiles.add(new SupportingFile("tornado/rest.mustache", packageFolder, "rest.py"));
             additionalProperties.put("tornado", "true");
         } else {
-            supportingFiles.add(new SupportingFile("rest.mustache", packageName, "rest.py"));
+            supportingFiles.add(new SupportingFile("rest.mustache", packageFolder, "rest.py"));
         }
 
         modelPackage = packageName + "." + modelPackage;