diff --git a/modules/swagger-codegen/src/main/java/com/wordnik/swagger/codegen/languages/PythonClientCodegen.java b/modules/swagger-codegen/src/main/java/com/wordnik/swagger/codegen/languages/PythonClientCodegen.java
index 679b3174c7c..7f9a77d3132 100755
--- a/modules/swagger-codegen/src/main/java/com/wordnik/swagger/codegen/languages/PythonClientCodegen.java
+++ b/modules/swagger-codegen/src/main/java/com/wordnik/swagger/codegen/languages/PythonClientCodegen.java
@@ -71,7 +71,6 @@ public class PythonClientCodegen extends DefaultCodegen implements CodegenConfig
     supportingFiles.add(new SupportingFile("setup.mustache", eggPackage, "setup.py"));
     supportingFiles.add(new SupportingFile("api_client.mustache", invokerPackage, "api_client.py"));
     supportingFiles.add(new SupportingFile("rest.mustache", invokerPackage, "rest.py"));
-    supportingFiles.add(new SupportingFile("util.mustache", invokerPackage, "util.py"));
     supportingFiles.add(new SupportingFile("configuration.mustache", invokerPackage, "configuration.py"));
     supportingFiles.add(new SupportingFile("__init__package.mustache", invokerPackage, "__init__.py"));
     supportingFiles.add(new SupportingFile("__init__model.mustache", modelPackage, "__init__.py"));
diff --git a/modules/swagger-codegen/src/main/resources/python/api.mustache b/modules/swagger-codegen/src/main/resources/python/api.mustache
index 69c90491b95..a91797d71b6 100644
--- a/modules/swagger-codegen/src/main/resources/python/api.mustache
+++ b/modules/swagger-codegen/src/main/resources/python/api.mustache
@@ -27,8 +27,6 @@ import os
 # python 2 and python 3 compatibility library
 from six import iteritems
 
-from ..util import remove_none
-
 from ..api_client import ApiClient
 
 {{#operations}}
@@ -66,13 +64,32 @@ class {{classname}}(object):
         resource_path = '{{path}}'.replace('{format}', 'json')
         method = '{{httpMethod}}'
 
-        path_params = remove_none(dict({{#pathParams}}{{baseName}}=params.get('{{paramName}}'){{#hasMore}}, {{/hasMore}}{{/pathParams}}))
-        query_params = remove_none(dict({{#queryParams}}{{baseName}}=params.get('{{paramName}}'){{#hasMore}}, {{/hasMore}}{{/queryParams}}))
-        header_params = remove_none(dict({{#headerParams}}{{baseName}}=params.get('{{paramName}}'){{#hasMore}}, {{/hasMore}}{{/headerParams}}))
-        form_params = remove_none(dict({{#formParams}}{{^isFile}}{{baseName}}=params.get('{{paramName}}'){{#hasMore}}, {{/hasMore}}{{/isFile}}{{/formParams}}))
-        files = remove_none(dict({{#formParams}}{{#isFile}}{{baseName}}=params.get('{{paramName}}'){{#hasMore}}, {{/hasMore}}{{/isFile}}{{/formParams}}))
-        body_params = {{#bodyParam}}params.get('{{paramName}}'){{/bodyParam}}{{^bodyParam}}None{{/bodyParam}}
-
+        path_params = {}
+        {{#pathParams}}
+        if '{{paramName}}' in params:
+            path_params['{{baseName}}'] = params['{{paramName}}']  
+        {{/pathParams}}
+        query_params = {}
+        {{#queryParams}}
+        if '{{paramName}}' in params:
+            query_params['{{baseName}}'] = params['{{paramName}}']
+        {{/queryParams}}
+        header_params = {}
+        {{#headerParams}}
+        if '{{paramName}}' in params:
+            header_params['{{baseName}}'] = params['{{paramName}}']
+        {{/headerParams}}
+        form_params = {}
+        files = {}
+        {{#formParams}}
+        if '{{paramName}}' in params:
+            {{#notFile}}form_params['{{baseName}}'] = params['{{paramName}}']{{/notFile}}{{#isFile}}files['{{baseName}}'] = params['{{paramName}}']{{/isFile}}
+        {{/formParams}}
+        body_params = None
+        {{#bodyParam}}
+        if '{{paramName}}' in params:
+            body_params = params['{{paramName}}']
+        {{/bodyParam}}
         # HTTP header `Accept`
         header_params['Accept'] = self.api_client.select_header_accept([{{#produces}}'{{mediaType}}'{{#hasMore}}, {{/hasMore}}{{/produces}}])
         if not header_params['Accept']:
diff --git a/modules/swagger-codegen/src/main/resources/python/api_client.mustache b/modules/swagger-codegen/src/main/resources/python/api_client.mustache
index 4ba445e2fa6..75c6e336a07 100644
--- a/modules/swagger-codegen/src/main/resources/python/api_client.mustache
+++ b/modules/swagger-codegen/src/main/resources/python/api_client.mustache
@@ -248,11 +248,12 @@ class ApiClient(object):
 
     if files:
       for k, v in iteritems(files):
-        with open(v, 'rb') as f:
-          filename = os.path.basename(f.name)
-          filedata = f.read()
-          mimetype = mimetypes.guess_type(filename)[0] or 'application/octet-stream'
-        params[k] = tuple([filename, filedata, mimetype])
+        if v:
+          with open(v, 'rb') as f:
+            filename = os.path.basename(f.name)
+            filedata = f.read()
+            mimetype = mimetypes.guess_type(filename)[0] or 'application/octet-stream'
+            params[k] = tuple([filename, filedata, mimetype])
 
     return params
 
diff --git a/modules/swagger-codegen/src/main/resources/python/util.mustache b/modules/swagger-codegen/src/main/resources/python/util.mustache
deleted file mode 100644
index 92df1e37e3a..00000000000
--- a/modules/swagger-codegen/src/main/resources/python/util.mustache
+++ /dev/null
@@ -1,16 +0,0 @@
-# coding: utf-8
-
-from six import iteritems
-
-def remove_none(obj):
-    """
-    Remove None from `list`, `tuple`, `set`.
-    Remove None value from `dict`.
-    """
-    if isinstance(obj, (list, tuple, set)):
-        return type(obj)(remove_none(x) for x in obj if x is not None)
-    elif isinstance(obj, dict):
-        return type(obj)((remove_none(k), remove_none(v))
-                         for k, v in iteritems(obj) if k is not None and v is not None)
-    else:
-        return obj
diff --git a/samples/client/petstore/python/SwaggerPetstore-python/SwaggerPetstore/api_client.py b/samples/client/petstore/python/SwaggerPetstore-python/SwaggerPetstore/api_client.py
index 4ba445e2fa6..75c6e336a07 100644
--- a/samples/client/petstore/python/SwaggerPetstore-python/SwaggerPetstore/api_client.py
+++ b/samples/client/petstore/python/SwaggerPetstore-python/SwaggerPetstore/api_client.py
@@ -248,11 +248,12 @@ class ApiClient(object):
 
     if files:
       for k, v in iteritems(files):
-        with open(v, 'rb') as f:
-          filename = os.path.basename(f.name)
-          filedata = f.read()
-          mimetype = mimetypes.guess_type(filename)[0] or 'application/octet-stream'
-        params[k] = tuple([filename, filedata, mimetype])
+        if v:
+          with open(v, 'rb') as f:
+            filename = os.path.basename(f.name)
+            filedata = f.read()
+            mimetype = mimetypes.guess_type(filename)[0] or 'application/octet-stream'
+            params[k] = tuple([filename, filedata, mimetype])
 
     return params
 
diff --git a/samples/client/petstore/python/SwaggerPetstore-python/SwaggerPetstore/apis/pet_api.py b/samples/client/petstore/python/SwaggerPetstore-python/SwaggerPetstore/apis/pet_api.py
index 1a738e4c317..ec0a8c0f5fd 100644
--- a/samples/client/petstore/python/SwaggerPetstore-python/SwaggerPetstore/apis/pet_api.py
+++ b/samples/client/petstore/python/SwaggerPetstore-python/SwaggerPetstore/apis/pet_api.py
@@ -27,8 +27,6 @@ import os
 # python 2 and python 3 compatibility library
 from six import iteritems
 
-from ..util import remove_none
-
 from ..api_client import ApiClient
 
 class PetApi(object):
@@ -61,13 +59,20 @@ class PetApi(object):
         resource_path = '/pet'.replace('{format}', 'json')
         method = 'PUT'
 
-        path_params = remove_none(dict())
-        query_params = remove_none(dict())
-        header_params = remove_none(dict())
-        form_params = remove_none(dict())
-        files = remove_none(dict())
-        body_params = params.get('body')
-
+        path_params = {}
+        
+        query_params = {}
+        
+        header_params = {}
+        
+        form_params = {}
+        files = {}
+        
+        body_params = None
+        
+        if 'body' in params:
+            body_params = params['body']
+        
         # HTTP header `Accept`
         header_params['Accept'] = self.api_client.select_header_accept(['application/json', 'application/xml'])
         if not header_params['Accept']:
@@ -105,13 +110,20 @@ class PetApi(object):
         resource_path = '/pet'.replace('{format}', 'json')
         method = 'POST'
 
-        path_params = remove_none(dict())
-        query_params = remove_none(dict())
-        header_params = remove_none(dict())
-        form_params = remove_none(dict())
-        files = remove_none(dict())
-        body_params = params.get('body')
-
+        path_params = {}
+        
+        query_params = {}
+        
+        header_params = {}
+        
+        form_params = {}
+        files = {}
+        
+        body_params = None
+        
+        if 'body' in params:
+            body_params = params['body']
+        
         # HTTP header `Accept`
         header_params['Accept'] = self.api_client.select_header_accept(['application/json', 'application/xml'])
         if not header_params['Accept']:
@@ -149,13 +161,20 @@ class PetApi(object):
         resource_path = '/pet/findByStatus'.replace('{format}', 'json')
         method = 'GET'
 
-        path_params = remove_none(dict())
-        query_params = remove_none(dict(status=params.get('status')))
-        header_params = remove_none(dict())
-        form_params = remove_none(dict())
-        files = remove_none(dict())
+        path_params = {}
+        
+        query_params = {}
+        
+        if 'status' in params:
+            query_params['status'] = params['status']
+        
+        header_params = {}
+        
+        form_params = {}
+        files = {}
+        
         body_params = None
-
+        
         # HTTP header `Accept`
         header_params['Accept'] = self.api_client.select_header_accept(['application/json', 'application/xml'])
         if not header_params['Accept']:
@@ -195,13 +214,20 @@ class PetApi(object):
         resource_path = '/pet/findByTags'.replace('{format}', 'json')
         method = 'GET'
 
-        path_params = remove_none(dict())
-        query_params = remove_none(dict(tags=params.get('tags')))
-        header_params = remove_none(dict())
-        form_params = remove_none(dict())
-        files = remove_none(dict())
+        path_params = {}
+        
+        query_params = {}
+        
+        if 'tags' in params:
+            query_params['tags'] = params['tags']
+        
+        header_params = {}
+        
+        form_params = {}
+        files = {}
+        
         body_params = None
-
+        
         # HTTP header `Accept`
         header_params['Accept'] = self.api_client.select_header_accept(['application/json', 'application/xml'])
         if not header_params['Accept']:
@@ -245,13 +271,20 @@ class PetApi(object):
         resource_path = '/pet/{petId}'.replace('{format}', 'json')
         method = 'GET'
 
-        path_params = remove_none(dict(petId=params.get('pet_id')))
-        query_params = remove_none(dict())
-        header_params = remove_none(dict())
-        form_params = remove_none(dict())
-        files = remove_none(dict())
+        path_params = {}
+        
+        if 'pet_id' in params:
+            path_params['petId'] = params['pet_id']  
+        
+        query_params = {}
+        
+        header_params = {}
+        
+        form_params = {}
+        files = {}
+        
         body_params = None
-
+        
         # HTTP header `Accept`
         header_params['Accept'] = self.api_client.select_header_accept(['application/json', 'application/xml'])
         if not header_params['Accept']:
@@ -297,13 +330,26 @@ class PetApi(object):
         resource_path = '/pet/{petId}'.replace('{format}', 'json')
         method = 'POST'
 
-        path_params = remove_none(dict(petId=params.get('pet_id')))
-        query_params = remove_none(dict())
-        header_params = remove_none(dict())
-        form_params = remove_none(dict(name=params.get('name'), status=params.get('status')))
-        files = remove_none(dict())
+        path_params = {}
+        
+        if 'pet_id' in params:
+            path_params['petId'] = params['pet_id']  
+        
+        query_params = {}
+        
+        header_params = {}
+        
+        form_params = {}
+        files = {}
+        
+        if 'name' in params:
+            form_params['name'] = params['name']
+        
+        if 'status' in params:
+            form_params['status'] = params['status']
+        
         body_params = None
-
+        
         # HTTP header `Accept`
         header_params['Accept'] = self.api_client.select_header_accept(['application/json', 'application/xml'])
         if not header_params['Accept']:
@@ -346,13 +392,23 @@ class PetApi(object):
         resource_path = '/pet/{petId}'.replace('{format}', 'json')
         method = 'DELETE'
 
-        path_params = remove_none(dict(petId=params.get('pet_id')))
-        query_params = remove_none(dict())
-        header_params = remove_none(dict(api_key=params.get('api_key')))
-        form_params = remove_none(dict())
-        files = remove_none(dict())
+        path_params = {}
+        
+        if 'pet_id' in params:
+            path_params['petId'] = params['pet_id']  
+        
+        query_params = {}
+        
+        header_params = {}
+        
+        if 'api_key' in params:
+            header_params['api_key'] = params['api_key']
+        
+        form_params = {}
+        files = {}
+        
         body_params = None
-
+        
         # HTTP header `Accept`
         header_params['Accept'] = self.api_client.select_header_accept(['application/json', 'application/xml'])
         if not header_params['Accept']:
@@ -396,13 +452,26 @@ class PetApi(object):
         resource_path = '/pet/{petId}/uploadImage'.replace('{format}', 'json')
         method = 'POST'
 
-        path_params = remove_none(dict(petId=params.get('pet_id')))
-        query_params = remove_none(dict())
-        header_params = remove_none(dict())
-        form_params = remove_none(dict(additionalMetadata=params.get('additional_metadata'), ))
-        files = remove_none(dict(file=params.get('file')))
+        path_params = {}
+        
+        if 'pet_id' in params:
+            path_params['petId'] = params['pet_id']  
+        
+        query_params = {}
+        
+        header_params = {}
+        
+        form_params = {}
+        files = {}
+        
+        if 'additional_metadata' in params:
+            form_params['additionalMetadata'] = params['additional_metadata']
+        
+        if 'file' in params:
+            files['file'] = params['file']
+        
         body_params = None
-
+        
         # HTTP header `Accept`
         header_params['Accept'] = self.api_client.select_header_accept(['application/json', 'application/xml'])
         if not header_params['Accept']:
@@ -427,3 +496,6 @@ class PetApi(object):
 
 
 
+
+
+
diff --git a/samples/client/petstore/python/SwaggerPetstore-python/SwaggerPetstore/apis/store_api.py b/samples/client/petstore/python/SwaggerPetstore-python/SwaggerPetstore/apis/store_api.py
index aab7d0f11b6..03f0b2ec170 100644
--- a/samples/client/petstore/python/SwaggerPetstore-python/SwaggerPetstore/apis/store_api.py
+++ b/samples/client/petstore/python/SwaggerPetstore-python/SwaggerPetstore/apis/store_api.py
@@ -27,8 +27,6 @@ import os
 # python 2 and python 3 compatibility library
 from six import iteritems
 
-from ..util import remove_none
-
 from ..api_client import ApiClient
 
 class StoreApi(object):
@@ -60,13 +58,17 @@ class StoreApi(object):
         resource_path = '/store/inventory'.replace('{format}', 'json')
         method = 'GET'
 
-        path_params = remove_none(dict())
-        query_params = remove_none(dict())
-        header_params = remove_none(dict())
-        form_params = remove_none(dict())
-        files = remove_none(dict())
+        path_params = {}
+        
+        query_params = {}
+        
+        header_params = {}
+        
+        form_params = {}
+        files = {}
+        
         body_params = None
-
+        
         # HTTP header `Accept`
         header_params['Accept'] = self.api_client.select_header_accept(['application/json', 'application/xml'])
         if not header_params['Accept']:
@@ -106,13 +108,20 @@ class StoreApi(object):
         resource_path = '/store/order'.replace('{format}', 'json')
         method = 'POST'
 
-        path_params = remove_none(dict())
-        query_params = remove_none(dict())
-        header_params = remove_none(dict())
-        form_params = remove_none(dict())
-        files = remove_none(dict())
-        body_params = params.get('body')
-
+        path_params = {}
+        
+        query_params = {}
+        
+        header_params = {}
+        
+        form_params = {}
+        files = {}
+        
+        body_params = None
+        
+        if 'body' in params:
+            body_params = params['body']
+        
         # HTTP header `Accept`
         header_params['Accept'] = self.api_client.select_header_accept(['application/json', 'application/xml'])
         if not header_params['Accept']:
@@ -156,13 +165,20 @@ class StoreApi(object):
         resource_path = '/store/order/{orderId}'.replace('{format}', 'json')
         method = 'GET'
 
-        path_params = remove_none(dict(orderId=params.get('order_id')))
-        query_params = remove_none(dict())
-        header_params = remove_none(dict())
-        form_params = remove_none(dict())
-        files = remove_none(dict())
+        path_params = {}
+        
+        if 'order_id' in params:
+            path_params['orderId'] = params['order_id']  
+        
+        query_params = {}
+        
+        header_params = {}
+        
+        form_params = {}
+        files = {}
+        
         body_params = None
-
+        
         # HTTP header `Accept`
         header_params['Accept'] = self.api_client.select_header_accept(['application/json', 'application/xml'])
         if not header_params['Accept']:
@@ -206,13 +222,20 @@ class StoreApi(object):
         resource_path = '/store/order/{orderId}'.replace('{format}', 'json')
         method = 'DELETE'
 
-        path_params = remove_none(dict(orderId=params.get('order_id')))
-        query_params = remove_none(dict())
-        header_params = remove_none(dict())
-        form_params = remove_none(dict())
-        files = remove_none(dict())
+        path_params = {}
+        
+        if 'order_id' in params:
+            path_params['orderId'] = params['order_id']  
+        
+        query_params = {}
+        
+        header_params = {}
+        
+        form_params = {}
+        files = {}
+        
         body_params = None
-
+        
         # HTTP header `Accept`
         header_params['Accept'] = self.api_client.select_header_accept(['application/json', 'application/xml'])
         if not header_params['Accept']:
diff --git a/samples/client/petstore/python/SwaggerPetstore-python/SwaggerPetstore/apis/user_api.py b/samples/client/petstore/python/SwaggerPetstore-python/SwaggerPetstore/apis/user_api.py
index 66cb235c3d7..223566b8684 100644
--- a/samples/client/petstore/python/SwaggerPetstore-python/SwaggerPetstore/apis/user_api.py
+++ b/samples/client/petstore/python/SwaggerPetstore-python/SwaggerPetstore/apis/user_api.py
@@ -27,8 +27,6 @@ import os
 # python 2 and python 3 compatibility library
 from six import iteritems
 
-from ..util import remove_none
-
 from ..api_client import ApiClient
 
 class UserApi(object):
@@ -61,13 +59,20 @@ class UserApi(object):
         resource_path = '/user'.replace('{format}', 'json')
         method = 'POST'
 
-        path_params = remove_none(dict())
-        query_params = remove_none(dict())
-        header_params = remove_none(dict())
-        form_params = remove_none(dict())
-        files = remove_none(dict())
-        body_params = params.get('body')
-
+        path_params = {}
+        
+        query_params = {}
+        
+        header_params = {}
+        
+        form_params = {}
+        files = {}
+        
+        body_params = None
+        
+        if 'body' in params:
+            body_params = params['body']
+        
         # HTTP header `Accept`
         header_params['Accept'] = self.api_client.select_header_accept(['application/json', 'application/xml'])
         if not header_params['Accept']:
@@ -105,13 +110,20 @@ class UserApi(object):
         resource_path = '/user/createWithArray'.replace('{format}', 'json')
         method = 'POST'
 
-        path_params = remove_none(dict())
-        query_params = remove_none(dict())
-        header_params = remove_none(dict())
-        form_params = remove_none(dict())
-        files = remove_none(dict())
-        body_params = params.get('body')
-
+        path_params = {}
+        
+        query_params = {}
+        
+        header_params = {}
+        
+        form_params = {}
+        files = {}
+        
+        body_params = None
+        
+        if 'body' in params:
+            body_params = params['body']
+        
         # HTTP header `Accept`
         header_params['Accept'] = self.api_client.select_header_accept(['application/json', 'application/xml'])
         if not header_params['Accept']:
@@ -149,13 +161,20 @@ class UserApi(object):
         resource_path = '/user/createWithList'.replace('{format}', 'json')
         method = 'POST'
 
-        path_params = remove_none(dict())
-        query_params = remove_none(dict())
-        header_params = remove_none(dict())
-        form_params = remove_none(dict())
-        files = remove_none(dict())
-        body_params = params.get('body')
-
+        path_params = {}
+        
+        query_params = {}
+        
+        header_params = {}
+        
+        form_params = {}
+        files = {}
+        
+        body_params = None
+        
+        if 'body' in params:
+            body_params = params['body']
+        
         # HTTP header `Accept`
         header_params['Accept'] = self.api_client.select_header_accept(['application/json', 'application/xml'])
         if not header_params['Accept']:
@@ -194,13 +213,23 @@ class UserApi(object):
         resource_path = '/user/login'.replace('{format}', 'json')
         method = 'GET'
 
-        path_params = remove_none(dict())
-        query_params = remove_none(dict(username=params.get('username'), password=params.get('password')))
-        header_params = remove_none(dict())
-        form_params = remove_none(dict())
-        files = remove_none(dict())
+        path_params = {}
+        
+        query_params = {}
+        
+        if 'username' in params:
+            query_params['username'] = params['username']
+        
+        if 'password' in params:
+            query_params['password'] = params['password']
+        
+        header_params = {}
+        
+        form_params = {}
+        files = {}
+        
         body_params = None
-
+        
         # HTTP header `Accept`
         header_params['Accept'] = self.api_client.select_header_accept(['application/json', 'application/xml'])
         if not header_params['Accept']:
@@ -239,13 +268,17 @@ class UserApi(object):
         resource_path = '/user/logout'.replace('{format}', 'json')
         method = 'GET'
 
-        path_params = remove_none(dict())
-        query_params = remove_none(dict())
-        header_params = remove_none(dict())
-        form_params = remove_none(dict())
-        files = remove_none(dict())
+        path_params = {}
+        
+        query_params = {}
+        
+        header_params = {}
+        
+        form_params = {}
+        files = {}
+        
         body_params = None
-
+        
         # HTTP header `Accept`
         header_params['Accept'] = self.api_client.select_header_accept(['application/json', 'application/xml'])
         if not header_params['Accept']:
@@ -287,13 +320,20 @@ class UserApi(object):
         resource_path = '/user/{username}'.replace('{format}', 'json')
         method = 'GET'
 
-        path_params = remove_none(dict(username=params.get('username')))
-        query_params = remove_none(dict())
-        header_params = remove_none(dict())
-        form_params = remove_none(dict())
-        files = remove_none(dict())
+        path_params = {}
+        
+        if 'username' in params:
+            path_params['username'] = params['username']  
+        
+        query_params = {}
+        
+        header_params = {}
+        
+        form_params = {}
+        files = {}
+        
         body_params = None
-
+        
         # HTTP header `Accept`
         header_params['Accept'] = self.api_client.select_header_accept(['application/json', 'application/xml'])
         if not header_params['Accept']:
@@ -338,13 +378,23 @@ class UserApi(object):
         resource_path = '/user/{username}'.replace('{format}', 'json')
         method = 'PUT'
 
-        path_params = remove_none(dict(username=params.get('username')))
-        query_params = remove_none(dict())
-        header_params = remove_none(dict())
-        form_params = remove_none(dict())
-        files = remove_none(dict())
-        body_params = params.get('body')
-
+        path_params = {}
+        
+        if 'username' in params:
+            path_params['username'] = params['username']  
+        
+        query_params = {}
+        
+        header_params = {}
+        
+        form_params = {}
+        files = {}
+        
+        body_params = None
+        
+        if 'body' in params:
+            body_params = params['body']
+        
         # HTTP header `Accept`
         header_params['Accept'] = self.api_client.select_header_accept(['application/json', 'application/xml'])
         if not header_params['Accept']:
@@ -386,13 +436,20 @@ class UserApi(object):
         resource_path = '/user/{username}'.replace('{format}', 'json')
         method = 'DELETE'
 
-        path_params = remove_none(dict(username=params.get('username')))
-        query_params = remove_none(dict())
-        header_params = remove_none(dict())
-        form_params = remove_none(dict())
-        files = remove_none(dict())
+        path_params = {}
+        
+        if 'username' in params:
+            path_params['username'] = params['username']  
+        
+        query_params = {}
+        
+        header_params = {}
+        
+        form_params = {}
+        files = {}
+        
         body_params = None
-
+        
         # HTTP header `Accept`
         header_params['Accept'] = self.api_client.select_header_accept(['application/json', 'application/xml'])
         if not header_params['Accept']:
diff --git a/samples/client/petstore/python/SwaggerPetstore-python/SwaggerPetstore/util.py b/samples/client/petstore/python/SwaggerPetstore-python/SwaggerPetstore/util.py
deleted file mode 100644
index 92df1e37e3a..00000000000
--- a/samples/client/petstore/python/SwaggerPetstore-python/SwaggerPetstore/util.py
+++ /dev/null
@@ -1,16 +0,0 @@
-# coding: utf-8
-
-from six import iteritems
-
-def remove_none(obj):
-    """
-    Remove None from `list`, `tuple`, `set`.
-    Remove None value from `dict`.
-    """
-    if isinstance(obj, (list, tuple, set)):
-        return type(obj)(remove_none(x) for x in obj if x is not None)
-    elif isinstance(obj, dict):
-        return type(obj)((remove_none(k), remove_none(v))
-                         for k, v in iteritems(obj) if k is not None and v is not None)
-    else:
-        return obj