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 590e17f6326..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
@@ -27,15 +27,16 @@ public class PythonClientCodegen extends DefaultCodegen implements CodegenConfig
     super();
 
     eggPackage = module + "-python";
-    invokerPackage = eggPackage + "/" + module;
+    
+    invokerPackage = eggPackage + File.separatorChar + module;
 
-    outputFolder = "generated-code/python";
+    outputFolder = "generated-code" + File.separatorChar + "python";
     modelTemplateFiles.put("model.mustache", ".py");
     apiTemplateFiles.put("api.mustache", ".py");
     templateDir = "python";
 
-    apiPackage = invokerPackage + ".apis";
-    modelPackage = invokerPackage + ".models";
+    apiPackage = invokerPackage + File.separatorChar + "apis";
+    modelPackage = invokerPackage + File.separatorChar + "models";
 
     languageSpecificPrimitives.clear();
     languageSpecificPrimitives.add("int");
@@ -68,13 +69,12 @@ public class PythonClientCodegen extends DefaultCodegen implements CodegenConfig
 
     supportingFiles.add(new SupportingFile("README.mustache", eggPackage, "README.md"));
     supportingFiles.add(new SupportingFile("setup.mustache", eggPackage, "setup.py"));
-    supportingFiles.add(new SupportingFile("swagger.mustache", invokerPackage, "swagger.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("config.mustache", invokerPackage, "config.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.replace('.', File.separatorChar), "__init__.py"));
-    supportingFiles.add(new SupportingFile("__init__api.mustache", apiPackage.replace('.', File.separatorChar), "__init__.py"));
+    supportingFiles.add(new SupportingFile("__init__model.mustache", modelPackage, "__init__.py"));
+    supportingFiles.add(new SupportingFile("__init__api.mustache", apiPackage, "__init__.py"));
   }
 
   @Override
@@ -84,11 +84,11 @@ public class PythonClientCodegen extends DefaultCodegen implements CodegenConfig
 
   @Override
   public String apiFileFolder() {
-    return outputFolder + "/" + apiPackage().replace('.', File.separatorChar);
+    return outputFolder + File.separatorChar + apiPackage().replace('.', File.separatorChar);
   }
 
   public String modelFileFolder() {
-    return outputFolder + "/" + modelPackage().replace('.', File.separatorChar);
+    return outputFolder + File.separatorChar + modelPackage().replace('.', File.separatorChar);
   }
 
   @Override
diff --git a/modules/swagger-codegen/src/main/resources/python/__init__package.mustache b/modules/swagger-codegen/src/main/resources/python/__init__package.mustache
index 7b48136d3a9..921f4dac0eb 100644
--- a/modules/swagger-codegen/src/main/resources/python/__init__package.mustache
+++ b/modules/swagger-codegen/src/main/resources/python/__init__package.mustache
@@ -7,4 +7,4 @@ from __future__ import absolute_import
 {{#apiInfo}}{{#apis}}from .apis.{{classVarName}} import {{classname}}
 {{/apis}}{{/apiInfo}}
 # import ApiClient
-from .swagger import ApiClient
+from .api_client import ApiClient
diff --git a/modules/swagger-codegen/src/main/resources/python/api.mustache b/modules/swagger-codegen/src/main/resources/python/api.mustache
index d5e24398f0e..7153ee2b040 100644
--- a/modules/swagger-codegen/src/main/resources/python/api.mustache
+++ b/modules/swagger-codegen/src/main/resources/python/api.mustache
@@ -27,9 +27,8 @@ import os
 # python 2 and python 3 compatibility library
 from six import iteritems
 
-from ..util import remove_none
-
-from .. import config
+from .. import configuration
+from ..api_client import ApiClient
 
 {{#operations}}
 class {{classname}}(object):
@@ -38,7 +37,10 @@ class {{classname}}(object):
         if api_client:
             self.api_client = api_client
         else:
-            self.api_client = config.api_client
+            if not configuration.api_client:
+                configuration.api_client = ApiClient('{{basePath}}')
+            self.api_client = configuration.api_client
+    
     {{#operation}}
     def {{nickname}}(self, {{#allParams}}{{#required}}{{paramName}}, {{/required}}{{/allParams}}**kwargs):
         """
@@ -66,13 +68,32 @@ 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']:
@@ -81,9 +102,12 @@ class {{classname}}(object):
         # HTTP header `Content-Type`
         header_params['Content-Type'] = self.api_client.select_header_content_type([{{#consumes}}'{{mediaType}}'{{#hasMore}}, {{/hasMore}}{{/consumes}}])
 
+        # Authentication setting
+        auth_settings = [{{#authMethods}}'{{name}}'{{#hasMore}}, {{/hasMore}}{{/authMethods}}]
+
         response = self.api_client.call_api(resource_path, method, path_params, query_params, header_params,
                                             body=body_params, post_params=form_params, files=files,
-                                            response={{#returnType}}'{{returnType}}'{{/returnType}}{{^returnType}}None{{/returnType}})
+                                            response={{#returnType}}'{{returnType}}'{{/returnType}}{{^returnType}}None{{/returnType}}, auth_settings=auth_settings)
         {{#returnType}}
         return response
         {{/returnType}}{{/operation}}
diff --git a/samples/client/petstore/python/SwaggerPetstore-python/SwaggerPetstore/swagger.py b/modules/swagger-codegen/src/main/resources/python/api_client.mustache
similarity index 86%
rename from samples/client/petstore/python/SwaggerPetstore-python/SwaggerPetstore/swagger.py
rename to modules/swagger-codegen/src/main/resources/python/api_client.mustache
index 21430c469c8..b8cc4cc2a84 100644
--- a/samples/client/petstore/python/SwaggerPetstore-python/SwaggerPetstore/swagger.py
+++ b/modules/swagger-codegen/src/main/resources/python/api_client.mustache
@@ -28,6 +28,7 @@ except ImportError:
   # for python2
   from urllib import quote
 
+from . import configuration
 
 class ApiClient(object):
   """
@@ -37,7 +38,7 @@ class ApiClient(object):
   :param header_name: a header to pass when making calls to the API
   :param header_value: a header value to pass when making calls to the API
   """
-  def __init__(self, host=None, header_name=None, header_value=None):
+  def __init__(self, host=configuration.host, header_name=None, header_value=None):
     self.default_headers = {}
     if header_name is not None:
       self.default_headers[header_name] = header_value
@@ -58,15 +59,15 @@ class ApiClient(object):
     self.default_headers[header_name] = header_value
 
   def call_api(self, resource_path, method, path_params=None, query_params=None, header_params=None,
-               body=None, post_params=None, files=None, response=None):
+               body=None, post_params=None, files=None, response=None, auth_settings=None):
 
     # headers parameters
-    headers = self.default_headers.copy()
-    headers.update(header_params)
+    header_params = header_params or {}
+    header_params.update(self.default_headers)
     if self.cookie:
-      headers['Cookie'] = self.cookie
-    if headers:
-      headers = self.sanitize_for_serialization(headers)
+      header_params['Cookie'] = self.cookie
+    if header_params:
+      header_params = self.sanitize_for_serialization(header_params)
 
     # path parameters
     if path_params:
@@ -85,6 +86,9 @@ class ApiClient(object):
       post_params = self.prepare_post_parameters(post_params, files)
       post_params = self.sanitize_for_serialization(post_params)
 
+    # auth setting
+    self.update_params_for_auth(header_params, query_params, auth_settings)
+
     # body
     if body:
       body = self.sanitize_for_serialization(body)
@@ -93,7 +97,7 @@ class ApiClient(object):
     url = self.host + resource_path
 
     # perform request and return response
-    response_data = self.request(method, url, query_params=query_params, headers=headers,
+    response_data = self.request(method, url, query_params=query_params, headers=header_params,
                                  post_params=post_params, body=body)
 
     # deserialize response data
@@ -244,11 +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
 
@@ -279,3 +284,20 @@ class ApiClient(object):
       return 'application/json'
     else:
       return content_types[0]
+
+  def update_params_for_auth(self, headers, querys, auth_settings):
+    """
+    Update header and query params based on authentication setting
+    """
+    if not auth_settings:
+      return
+    
+    for auth in auth_settings:
+      auth_setting = configuration.auth_settings().get(auth)
+      if auth_setting:
+        if auth_setting['in'] == 'header':
+          headers[auth_setting['key']] = auth_setting['value']
+        elif auth_setting['in'] == 'query':
+          querys[auth_setting['key']] = auth_setting['value']
+        else:
+          raise ValueError('Authentication token must be in `query` or `header`')
diff --git a/modules/swagger-codegen/src/main/resources/python/config.mustache b/modules/swagger-codegen/src/main/resources/python/config.mustache
deleted file mode 100644
index e8c36aee77b..00000000000
--- a/modules/swagger-codegen/src/main/resources/python/config.mustache
+++ /dev/null
@@ -1,8 +0,0 @@
-from __future__ import absolute_import
-
-from .swagger import ApiClient
-
-# Configuration variables
-
-api_client = ApiClient("{{basePath}}")
-
diff --git a/modules/swagger-codegen/src/main/resources/python/configuration.mustache b/modules/swagger-codegen/src/main/resources/python/configuration.mustache
new file mode 100644
index 00000000000..d3a7093a02a
--- /dev/null
+++ b/modules/swagger-codegen/src/main/resources/python/configuration.mustache
@@ -0,0 +1,51 @@
+from __future__ import absolute_import
+import base64
+import urllib3
+
+def get_api_key_with_prefix(key):
+    global api_key
+    global api_key_prefix
+
+    if api_key.get(key) and api_key_prefix.get(key):
+      return api_key_prefix[key] + ' ' + api_key[key]
+    elif api_key.get(key):
+      return api_key[key]
+
+def get_basic_auth_token():
+    global username
+    global password
+
+    return urllib3.util.make_headers(basic_auth=username + ':' + password).get('authorization')
+
+def auth_settings():
+    return { {{#authMethods}}{{#isApiKey}}
+               '{{name}}': {
+                   'type': 'api_key',
+                   'in': {{#isKeyInHeader}}'header'{{/isKeyInHeader}}{{#isKeyInQuery}}'query'{{/isKeyInQuery}},
+                   'key': '{{keyParamName}}',
+                   'value': get_api_key_with_prefix('{{keyParamName}}')
+               },
+             {{/isApiKey}}{{#isBasic}}
+               '{{name}}': {
+                   'type': 'basic',
+                   'in': 'header',
+                   'key': 'Authorization',
+                   'value': get_basic_auth_token()
+               },
+             {{/isBasic}}{{/authMethods}}
+           }
+
+# Default Base url
+host = "{{basePath}}"
+
+# Default api client
+api_client = None
+             
+# Authentication settings
+
+api_key = {}
+api_key_prefix = {}
+username = ''
+password = ''
+
+
diff --git a/modules/swagger-codegen/src/main/resources/python/rest.mustache b/modules/swagger-codegen/src/main/resources/python/rest.mustache
index da99abc2493..508f3d6693a 100644
--- a/modules/swagger-codegen/src/main/resources/python/rest.mustache
+++ b/modules/swagger-codegen/src/main/resources/python/rest.mustache
@@ -1,4 +1,10 @@
 # coding: utf-8
+
+"""
+Credit: this file (rest.py) is modified based on rest.py in Dropbox Python SDK:
+https://www.dropbox.com/developers/core/sdks/python
+"""
+
 import sys
 import io
 import json
@@ -120,7 +126,7 @@ class RESTClientObject(object):
         r = RESTResponse(r)
 
         if r.status not in range(200, 206):
-            raise ErrorResponse(r)
+            raise ApiException(r)
 
         return self.process_response(r)
 
@@ -157,7 +163,7 @@ class RESTClientObject(object):
         return self.request("PATCH", url, headers=headers, post_params=post_params, body=body)
 
 
-class ErrorResponse(Exception):
+class ApiException(Exception):
     """
     Non-2xx HTTP response
     """
@@ -184,7 +190,10 @@ class ErrorResponse(Exception):
         """
         Custom error response messages
         """
-        return "({0})\nReason: {1}\nHeader: {2}\nBody: {3}\n".\
+        return "({0})\n"\
+            "Reason: {1}\n"\
+            "HTTP response headers: {2}\n"\
+            "HTTP response body: {3}\n".\
             format(self.status, self.reason, self.headers, self.body)
 
 class RESTClient(object):
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 1137a5d2d23..00000000000
--- a/modules/swagger-codegen/src/main/resources/python/util.mustache
+++ /dev/null
@@ -1,17 +0,0 @@
-from six import iteritems
-
-def remove_none(obj):
-    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
-
-
-def inspect_vars(obj):
-    if not hasattr(obj, '__dict__'):
-        return obj
-    else:
-        return {k: inspect_vars(getattr(obj, k)) for k in dir(obj)}
diff --git a/samples/client/petstore/python/SwaggerPetstore-python/SwaggerPetstore/__init__.py b/samples/client/petstore/python/SwaggerPetstore-python/SwaggerPetstore/__init__.py
index 9d4b2db3de5..3e7b51b8467 100644
--- a/samples/client/petstore/python/SwaggerPetstore-python/SwaggerPetstore/__init__.py
+++ b/samples/client/petstore/python/SwaggerPetstore-python/SwaggerPetstore/__init__.py
@@ -13,4 +13,4 @@ from .apis.pet_api import PetApi
 from .apis.store_api import StoreApi
 
 # import ApiClient
-from .swagger import ApiClient
+from .api_client import ApiClient
diff --git a/modules/swagger-codegen/src/main/resources/python/swagger.mustache b/samples/client/petstore/python/SwaggerPetstore-python/SwaggerPetstore/api_client.py
similarity index 86%
rename from modules/swagger-codegen/src/main/resources/python/swagger.mustache
rename to samples/client/petstore/python/SwaggerPetstore-python/SwaggerPetstore/api_client.py
index 21430c469c8..b8cc4cc2a84 100644
--- a/modules/swagger-codegen/src/main/resources/python/swagger.mustache
+++ b/samples/client/petstore/python/SwaggerPetstore-python/SwaggerPetstore/api_client.py
@@ -28,6 +28,7 @@ except ImportError:
   # for python2
   from urllib import quote
 
+from . import configuration
 
 class ApiClient(object):
   """
@@ -37,7 +38,7 @@ class ApiClient(object):
   :param header_name: a header to pass when making calls to the API
   :param header_value: a header value to pass when making calls to the API
   """
-  def __init__(self, host=None, header_name=None, header_value=None):
+  def __init__(self, host=configuration.host, header_name=None, header_value=None):
     self.default_headers = {}
     if header_name is not None:
       self.default_headers[header_name] = header_value
@@ -58,15 +59,15 @@ class ApiClient(object):
     self.default_headers[header_name] = header_value
 
   def call_api(self, resource_path, method, path_params=None, query_params=None, header_params=None,
-               body=None, post_params=None, files=None, response=None):
+               body=None, post_params=None, files=None, response=None, auth_settings=None):
 
     # headers parameters
-    headers = self.default_headers.copy()
-    headers.update(header_params)
+    header_params = header_params or {}
+    header_params.update(self.default_headers)
     if self.cookie:
-      headers['Cookie'] = self.cookie
-    if headers:
-      headers = self.sanitize_for_serialization(headers)
+      header_params['Cookie'] = self.cookie
+    if header_params:
+      header_params = self.sanitize_for_serialization(header_params)
 
     # path parameters
     if path_params:
@@ -85,6 +86,9 @@ class ApiClient(object):
       post_params = self.prepare_post_parameters(post_params, files)
       post_params = self.sanitize_for_serialization(post_params)
 
+    # auth setting
+    self.update_params_for_auth(header_params, query_params, auth_settings)
+
     # body
     if body:
       body = self.sanitize_for_serialization(body)
@@ -93,7 +97,7 @@ class ApiClient(object):
     url = self.host + resource_path
 
     # perform request and return response
-    response_data = self.request(method, url, query_params=query_params, headers=headers,
+    response_data = self.request(method, url, query_params=query_params, headers=header_params,
                                  post_params=post_params, body=body)
 
     # deserialize response data
@@ -244,11 +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
 
@@ -279,3 +284,20 @@ class ApiClient(object):
       return 'application/json'
     else:
       return content_types[0]
+
+  def update_params_for_auth(self, headers, querys, auth_settings):
+    """
+    Update header and query params based on authentication setting
+    """
+    if not auth_settings:
+      return
+    
+    for auth in auth_settings:
+      auth_setting = configuration.auth_settings().get(auth)
+      if auth_setting:
+        if auth_setting['in'] == 'header':
+          headers[auth_setting['key']] = auth_setting['value']
+        elif auth_setting['in'] == 'query':
+          querys[auth_setting['key']] = auth_setting['value']
+        else:
+          raise ValueError('Authentication token must be in `query` or `header`')
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 ad4bad57412..549b7fe956f 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
@@ -27,9 +27,8 @@ import os
 # python 2 and python 3 compatibility library
 from six import iteritems
 
-from ..util import remove_none
-
-from .. import config
+from .. import configuration
+from ..api_client import ApiClient
 
 class PetApi(object):
 
@@ -37,7 +36,10 @@ class PetApi(object):
         if api_client:
             self.api_client = api_client
         else:
-            self.api_client = config.api_client
+            if not configuration.api_client:
+                configuration.api_client = ApiClient('http://petstore.swagger.io/v2')
+            self.api_client = configuration.api_client
+    
     
     def update_pet(self, **kwargs):
         """
@@ -61,13 +63,20 @@ 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']:
@@ -76,9 +85,12 @@ class PetApi(object):
         # HTTP header `Content-Type`
         header_params['Content-Type'] = self.api_client.select_header_content_type(['application/json', 'application/xml'])
 
+        # Authentication setting
+        auth_settings = ['petstore_auth']
+
         response = self.api_client.call_api(resource_path, method, path_params, query_params, header_params,
                                             body=body_params, post_params=form_params, files=files,
-                                            response=None)
+                                            response=None, auth_settings=auth_settings)
         
     def add_pet(self, **kwargs):
         """
@@ -102,13 +114,20 @@ 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']:
@@ -117,9 +136,12 @@ class PetApi(object):
         # HTTP header `Content-Type`
         header_params['Content-Type'] = self.api_client.select_header_content_type(['application/json', 'application/xml'])
 
+        # Authentication setting
+        auth_settings = ['petstore_auth']
+
         response = self.api_client.call_api(resource_path, method, path_params, query_params, header_params,
                                             body=body_params, post_params=form_params, files=files,
-                                            response=None)
+                                            response=None, auth_settings=auth_settings)
         
     def find_pets_by_status(self, **kwargs):
         """
@@ -143,13 +165,20 @@ 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']:
@@ -158,9 +187,12 @@ class PetApi(object):
         # HTTP header `Content-Type`
         header_params['Content-Type'] = self.api_client.select_header_content_type([])
 
+        # Authentication setting
+        auth_settings = ['petstore_auth']
+
         response = self.api_client.call_api(resource_path, method, path_params, query_params, header_params,
                                             body=body_params, post_params=form_params, files=files,
-                                            response='list[Pet]')
+                                            response='list[Pet]', auth_settings=auth_settings)
         
         return response
         
@@ -186,13 +218,20 @@ 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']:
@@ -201,9 +240,12 @@ class PetApi(object):
         # HTTP header `Content-Type`
         header_params['Content-Type'] = self.api_client.select_header_content_type([])
 
+        # Authentication setting
+        auth_settings = ['petstore_auth']
+
         response = self.api_client.call_api(resource_path, method, path_params, query_params, header_params,
                                             body=body_params, post_params=form_params, files=files,
-                                            response='list[Pet]')
+                                            response='list[Pet]', auth_settings=auth_settings)
         
         return response
         
@@ -233,13 +275,20 @@ 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']:
@@ -248,9 +297,12 @@ class PetApi(object):
         # HTTP header `Content-Type`
         header_params['Content-Type'] = self.api_client.select_header_content_type([])
 
+        # Authentication setting
+        auth_settings = ['api_key', 'petstore_auth']
+
         response = self.api_client.call_api(resource_path, method, path_params, query_params, header_params,
                                             body=body_params, post_params=form_params, files=files,
-                                            response='Pet')
+                                            response='Pet', auth_settings=auth_settings)
         
         return response
         
@@ -282,13 +334,26 @@ 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']:
@@ -297,9 +362,12 @@ class PetApi(object):
         # HTTP header `Content-Type`
         header_params['Content-Type'] = self.api_client.select_header_content_type(['application/x-www-form-urlencoded'])
 
+        # Authentication setting
+        auth_settings = ['petstore_auth']
+
         response = self.api_client.call_api(resource_path, method, path_params, query_params, header_params,
                                             body=body_params, post_params=form_params, files=files,
-                                            response=None)
+                                            response=None, auth_settings=auth_settings)
         
     def delete_pet(self, pet_id, **kwargs):
         """
@@ -328,13 +396,23 @@ 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']:
@@ -343,9 +421,12 @@ class PetApi(object):
         # HTTP header `Content-Type`
         header_params['Content-Type'] = self.api_client.select_header_content_type([])
 
+        # Authentication setting
+        auth_settings = ['petstore_auth']
+
         response = self.api_client.call_api(resource_path, method, path_params, query_params, header_params,
                                             body=body_params, post_params=form_params, files=files,
-                                            response=None)
+                                            response=None, auth_settings=auth_settings)
         
     def upload_file(self, pet_id, **kwargs):
         """
@@ -375,13 +456,26 @@ 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']:
@@ -390,9 +484,12 @@ class PetApi(object):
         # HTTP header `Content-Type`
         header_params['Content-Type'] = self.api_client.select_header_content_type(['multipart/form-data'])
 
+        # Authentication setting
+        auth_settings = ['petstore_auth']
+
         response = self.api_client.call_api(resource_path, method, path_params, query_params, header_params,
                                             body=body_params, post_params=form_params, files=files,
-                                            response=None)
+                                            response=None, auth_settings=auth_settings)
         
 
 
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 e973d3a6ba5..bd2fd9b8080 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
@@ -27,9 +27,8 @@ import os
 # python 2 and python 3 compatibility library
 from six import iteritems
 
-from ..util import remove_none
-
-from .. import config
+from .. import configuration
+from ..api_client import ApiClient
 
 class StoreApi(object):
 
@@ -37,7 +36,10 @@ class StoreApi(object):
         if api_client:
             self.api_client = api_client
         else:
-            self.api_client = config.api_client
+            if not configuration.api_client:
+                configuration.api_client = ApiClient('http://petstore.swagger.io/v2')
+            self.api_client = configuration.api_client
+    
     
     def get_inventory(self, **kwargs):
         """
@@ -60,13 +62,17 @@ 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']:
@@ -75,9 +81,12 @@ class StoreApi(object):
         # HTTP header `Content-Type`
         header_params['Content-Type'] = self.api_client.select_header_content_type([])
 
+        # Authentication setting
+        auth_settings = ['api_key']
+
         response = self.api_client.call_api(resource_path, method, path_params, query_params, header_params,
                                             body=body_params, post_params=form_params, files=files,
-                                            response='map(String, int)')
+                                            response='map(String, int)', auth_settings=auth_settings)
         
         return response
         
@@ -103,13 +112,20 @@ 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']:
@@ -118,9 +134,12 @@ class StoreApi(object):
         # HTTP header `Content-Type`
         header_params['Content-Type'] = self.api_client.select_header_content_type([])
 
+        # Authentication setting
+        auth_settings = []
+
         response = self.api_client.call_api(resource_path, method, path_params, query_params, header_params,
                                             body=body_params, post_params=form_params, files=files,
-                                            response='Order')
+                                            response='Order', auth_settings=auth_settings)
         
         return response
         
@@ -150,13 +169,20 @@ 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']:
@@ -165,9 +191,12 @@ class StoreApi(object):
         # HTTP header `Content-Type`
         header_params['Content-Type'] = self.api_client.select_header_content_type([])
 
+        # Authentication setting
+        auth_settings = []
+
         response = self.api_client.call_api(resource_path, method, path_params, query_params, header_params,
                                             body=body_params, post_params=form_params, files=files,
-                                            response='Order')
+                                            response='Order', auth_settings=auth_settings)
         
         return response
         
@@ -197,13 +226,20 @@ 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']:
@@ -212,9 +248,12 @@ class StoreApi(object):
         # HTTP header `Content-Type`
         header_params['Content-Type'] = self.api_client.select_header_content_type([])
 
+        # Authentication setting
+        auth_settings = []
+
         response = self.api_client.call_api(resource_path, method, path_params, query_params, header_params,
                                             body=body_params, post_params=form_params, files=files,
-                                            response=None)
+                                            response=None, auth_settings=auth_settings)
         
 
 
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 82874000d59..5aca93818d0 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
@@ -27,9 +27,8 @@ import os
 # python 2 and python 3 compatibility library
 from six import iteritems
 
-from ..util import remove_none
-
-from .. import config
+from .. import configuration
+from ..api_client import ApiClient
 
 class UserApi(object):
 
@@ -37,7 +36,10 @@ class UserApi(object):
         if api_client:
             self.api_client = api_client
         else:
-            self.api_client = config.api_client
+            if not configuration.api_client:
+                configuration.api_client = ApiClient('http://petstore.swagger.io/v2')
+            self.api_client = configuration.api_client
+    
     
     def create_user(self, **kwargs):
         """
@@ -61,13 +63,20 @@ 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']:
@@ -76,9 +85,12 @@ class UserApi(object):
         # HTTP header `Content-Type`
         header_params['Content-Type'] = self.api_client.select_header_content_type([])
 
+        # Authentication setting
+        auth_settings = []
+
         response = self.api_client.call_api(resource_path, method, path_params, query_params, header_params,
                                             body=body_params, post_params=form_params, files=files,
-                                            response=None)
+                                            response=None, auth_settings=auth_settings)
         
     def create_users_with_array_input(self, **kwargs):
         """
@@ -102,13 +114,20 @@ 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']:
@@ -117,9 +136,12 @@ class UserApi(object):
         # HTTP header `Content-Type`
         header_params['Content-Type'] = self.api_client.select_header_content_type([])
 
+        # Authentication setting
+        auth_settings = []
+
         response = self.api_client.call_api(resource_path, method, path_params, query_params, header_params,
                                             body=body_params, post_params=form_params, files=files,
-                                            response=None)
+                                            response=None, auth_settings=auth_settings)
         
     def create_users_with_list_input(self, **kwargs):
         """
@@ -143,13 +165,20 @@ 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']:
@@ -158,9 +187,12 @@ class UserApi(object):
         # HTTP header `Content-Type`
         header_params['Content-Type'] = self.api_client.select_header_content_type([])
 
+        # Authentication setting
+        auth_settings = []
+
         response = self.api_client.call_api(resource_path, method, path_params, query_params, header_params,
                                             body=body_params, post_params=form_params, files=files,
-                                            response=None)
+                                            response=None, auth_settings=auth_settings)
         
     def login_user(self, **kwargs):
         """
@@ -185,13 +217,23 @@ 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']:
@@ -200,9 +242,12 @@ class UserApi(object):
         # HTTP header `Content-Type`
         header_params['Content-Type'] = self.api_client.select_header_content_type([])
 
+        # Authentication setting
+        auth_settings = []
+
         response = self.api_client.call_api(resource_path, method, path_params, query_params, header_params,
                                             body=body_params, post_params=form_params, files=files,
-                                            response='str')
+                                            response='str', auth_settings=auth_settings)
         
         return response
         
@@ -227,13 +272,17 @@ 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']:
@@ -242,9 +291,12 @@ class UserApi(object):
         # HTTP header `Content-Type`
         header_params['Content-Type'] = self.api_client.select_header_content_type([])
 
+        # Authentication setting
+        auth_settings = []
+
         response = self.api_client.call_api(resource_path, method, path_params, query_params, header_params,
                                             body=body_params, post_params=form_params, files=files,
-                                            response=None)
+                                            response=None, auth_settings=auth_settings)
         
     def get_user_by_name(self, username, **kwargs):
         """
@@ -272,13 +324,20 @@ 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']:
@@ -287,9 +346,12 @@ class UserApi(object):
         # HTTP header `Content-Type`
         header_params['Content-Type'] = self.api_client.select_header_content_type([])
 
+        # Authentication setting
+        auth_settings = []
+
         response = self.api_client.call_api(resource_path, method, path_params, query_params, header_params,
                                             body=body_params, post_params=form_params, files=files,
-                                            response='User')
+                                            response='User', auth_settings=auth_settings)
         
         return response
         
@@ -320,13 +382,23 @@ 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']:
@@ -335,9 +407,12 @@ class UserApi(object):
         # HTTP header `Content-Type`
         header_params['Content-Type'] = self.api_client.select_header_content_type([])
 
+        # Authentication setting
+        auth_settings = []
+
         response = self.api_client.call_api(resource_path, method, path_params, query_params, header_params,
                                             body=body_params, post_params=form_params, files=files,
-                                            response=None)
+                                            response=None, auth_settings=auth_settings)
         
     def delete_user(self, username, **kwargs):
         """
@@ -365,13 +440,20 @@ 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']:
@@ -380,9 +462,12 @@ class UserApi(object):
         # HTTP header `Content-Type`
         header_params['Content-Type'] = self.api_client.select_header_content_type([])
 
+        # Authentication setting
+        auth_settings = []
+
         response = self.api_client.call_api(resource_path, method, path_params, query_params, header_params,
                                             body=body_params, post_params=form_params, files=files,
-                                            response=None)
+                                            response=None, auth_settings=auth_settings)
         
 
 
diff --git a/samples/client/petstore/python/SwaggerPetstore-python/SwaggerPetstore/config.py b/samples/client/petstore/python/SwaggerPetstore-python/SwaggerPetstore/config.py
deleted file mode 100644
index 6e158eedd70..00000000000
--- a/samples/client/petstore/python/SwaggerPetstore-python/SwaggerPetstore/config.py
+++ /dev/null
@@ -1,8 +0,0 @@
-from __future__ import absolute_import
-
-from .swagger import ApiClient
-
-# Configuration variables
-
-api_client = ApiClient("http://petstore.swagger.io/v2")
-
diff --git a/samples/client/petstore/python/SwaggerPetstore-python/SwaggerPetstore/configuration.py b/samples/client/petstore/python/SwaggerPetstore-python/SwaggerPetstore/configuration.py
new file mode 100644
index 00000000000..b5bd0a64e0a
--- /dev/null
+++ b/samples/client/petstore/python/SwaggerPetstore-python/SwaggerPetstore/configuration.py
@@ -0,0 +1,44 @@
+from __future__ import absolute_import
+import base64
+import urllib3
+
+def get_api_key_with_prefix(key):
+    global api_key
+    global api_key_prefix
+
+    if api_key.get(key) and api_key_prefix.get(key):
+      return api_key_prefix[key] + ' ' + api_key[key]
+    elif api_key.get(key):
+      return api_key[key]
+
+def get_basic_auth_token():
+    global username
+    global password
+
+    return urllib3.util.make_headers(basic_auth=username + ':' + password).get('authorization')
+
+def auth_settings():
+    return { 
+               'api_key': {
+                   'type': 'api_key',
+                   'in': 'header',
+                   'key': 'api_key',
+                   'value': get_api_key_with_prefix('api_key')
+               },
+             
+           }
+
+# Default Base url
+host = "http://petstore.swagger.io/v2"
+
+# Default api client
+api_client = None
+             
+# Authentication settings
+
+api_key = {}
+api_key_prefix = {}
+username = ''
+password = ''
+
+
diff --git a/samples/client/petstore/python/SwaggerPetstore-python/SwaggerPetstore/rest.py b/samples/client/petstore/python/SwaggerPetstore-python/SwaggerPetstore/rest.py
index da99abc2493..508f3d6693a 100644
--- a/samples/client/petstore/python/SwaggerPetstore-python/SwaggerPetstore/rest.py
+++ b/samples/client/petstore/python/SwaggerPetstore-python/SwaggerPetstore/rest.py
@@ -1,4 +1,10 @@
 # coding: utf-8
+
+"""
+Credit: this file (rest.py) is modified based on rest.py in Dropbox Python SDK:
+https://www.dropbox.com/developers/core/sdks/python
+"""
+
 import sys
 import io
 import json
@@ -120,7 +126,7 @@ class RESTClientObject(object):
         r = RESTResponse(r)
 
         if r.status not in range(200, 206):
-            raise ErrorResponse(r)
+            raise ApiException(r)
 
         return self.process_response(r)
 
@@ -157,7 +163,7 @@ class RESTClientObject(object):
         return self.request("PATCH", url, headers=headers, post_params=post_params, body=body)
 
 
-class ErrorResponse(Exception):
+class ApiException(Exception):
     """
     Non-2xx HTTP response
     """
@@ -184,7 +190,10 @@ class ErrorResponse(Exception):
         """
         Custom error response messages
         """
-        return "({0})\nReason: {1}\nHeader: {2}\nBody: {3}\n".\
+        return "({0})\n"\
+            "Reason: {1}\n"\
+            "HTTP response headers: {2}\n"\
+            "HTTP response body: {3}\n".\
             format(self.status, self.reason, self.headers, self.body)
 
 class RESTClient(object):
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 1137a5d2d23..00000000000
--- a/samples/client/petstore/python/SwaggerPetstore-python/SwaggerPetstore/util.py
+++ /dev/null
@@ -1,17 +0,0 @@
-from six import iteritems
-
-def remove_none(obj):
-    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
-
-
-def inspect_vars(obj):
-    if not hasattr(obj, '__dict__'):
-        return obj
-    else:
-        return {k: inspect_vars(getattr(obj, k)) for k in dir(obj)}
diff --git a/samples/client/petstore/python/SwaggerPetstore-python/tests/test_api_client.py b/samples/client/petstore/python/SwaggerPetstore-python/tests/test_api_client.py
index 5243430a93a..0ef4314d0f4 100644
--- a/samples/client/petstore/python/SwaggerPetstore-python/tests/test_api_client.py
+++ b/samples/client/petstore/python/SwaggerPetstore-python/tests/test_api_client.py
@@ -12,6 +12,7 @@ import time
 import unittest
 
 import SwaggerPetstore
+import SwaggerPetstore.configuration
 
 HOST = 'http://petstore.swagger.io/v2'
 
@@ -21,6 +22,31 @@ class ApiClientTests(unittest.TestCase):
     def setUp(self):
         self.api_client = SwaggerPetstore.ApiClient(HOST)
 
+    def test_configuration(self):
+        SwaggerPetstore.configuration.api_key['api_key'] = '123456'
+        SwaggerPetstore.configuration.api_key_prefix['api_key'] = 'PREFIX'
+        SwaggerPetstore.configuration.username = 'test_username'
+        SwaggerPetstore.configuration.password = 'test_password'
+
+        header_params = {'test1': 'value1'}
+        query_params = {'test2': 'value2'}
+        auth_settings = ['api_key', 'unknown']
+
+        # test prefix
+        self.assertEqual('PREFIX', SwaggerPetstore.configuration.api_key_prefix['api_key'])
+
+        # update parameters based on auth setting
+        self.api_client.update_params_for_auth(header_params, query_params, auth_settings)
+
+        # test api key auth
+        self.assertEqual(header_params['test1'], 'value1')
+        self.assertEqual(header_params['api_key'], 'PREFIX 123456')
+        self.assertEqual(query_params['test2'], 'value2')
+
+        # test basic auth
+        self.assertEqual('test_username', SwaggerPetstore.configuration.username)
+        self.assertEqual('test_password', SwaggerPetstore.configuration.password)
+
     def test_select_header_accept(self):
         accepts = ['APPLICATION/JSON', 'APPLICATION/XML']
         accept = self.api_client.select_header_accept(accepts)
diff --git a/samples/client/petstore/python/SwaggerPetstore-python/tests/test_api_exception.py b/samples/client/petstore/python/SwaggerPetstore-python/tests/test_api_exception.py
new file mode 100644
index 00000000000..d1b786241e8
--- /dev/null
+++ b/samples/client/petstore/python/SwaggerPetstore-python/tests/test_api_exception.py
@@ -0,0 +1,76 @@
+# coding: utf-8
+
+"""
+Run the tests.
+$ pip install nose (optional)
+$ cd SwaggerPetstore-python
+$ nosetests -v
+"""
+
+import os
+import time
+import unittest
+
+import SwaggerPetstore
+from SwaggerPetstore.rest import ApiException
+
+
+class ApiExceptionTests(unittest.TestCase):
+
+    def setUp(self):
+        self.api_client = SwaggerPetstore.ApiClient()
+        self.pet_api = SwaggerPetstore.PetApi(self.api_client)
+        self.setUpModels()
+
+    def setUpModels(self):
+        self.category = SwaggerPetstore.Category()
+        self.category.id = int(time.time())
+        self.category.name = "dog"
+        self.tag = SwaggerPetstore.Tag()
+        self.tag.id = int(time.time())
+        self.tag.name = "blank"
+        self.pet = SwaggerPetstore.Pet()
+        self.pet.id = int(time.time())
+        self.pet.name = "hello kity"
+        self.pet.photo_urls = ["http://foo.bar.com/1", "http://foo.bar.com/2"]
+        self.pet.status = "sold"
+        self.pet.category = self.category
+        self.pet.tags = [self.tag]
+
+    def tearDown(self):
+        time.sleep(1)
+
+    def test_404_error(self):
+        self.pet_api.add_pet(body=self.pet)
+        self.pet_api.delete_pet(pet_id=self.pet.id)
+        
+        with self.assertRaisesRegexp(ApiException, "Pet not found"):
+            self.pet_api.get_pet_by_id(pet_id=self.pet.id)
+
+        try:
+            self.pet_api.get_pet_by_id(pet_id=self.pet.id)
+        except ApiException as e:
+            self.assertEqual(e.status, 404)
+            self.assertEqual(e.reason, "Not Found")
+            self.assertDictEqual(e.body, {'message': 'Pet not found', 'code': 1, 'type': 'error'})
+
+    def test_500_error(self):
+        self.pet_api.add_pet(body=self.pet)
+
+        with self.assertRaisesRegexp(ApiException, "Internal Server Error"):
+            self.pet_api.upload_file(
+                pet_id=self.pet.id,
+                additional_metadata="special",
+                file=None
+            )
+
+        try:
+            self.pet_api.upload_file(
+                pet_id=self.pet.id,
+                additional_metadata="special",
+                file=None
+            )
+        except ApiException as e:
+            self.assertEqual(e.status, 500)
+            self.assertEqual(e.reason, "Internal Server Error")
+            self.assertRegexpMatches(e.body, "Error 500 Internal Server Error")
diff --git a/samples/client/petstore/python/SwaggerPetstore-python/tests/test_pet_api.py b/samples/client/petstore/python/SwaggerPetstore-python/tests/test_pet_api.py
index ee8c5dde14e..3bf18607729 100644
--- a/samples/client/petstore/python/SwaggerPetstore-python/tests/test_pet_api.py
+++ b/samples/client/petstore/python/SwaggerPetstore-python/tests/test_pet_api.py
@@ -12,8 +12,7 @@ import time
 import unittest
 
 import SwaggerPetstore
-from SwaggerPetstore.rest import ErrorResponse
-from SwaggerPetstore import config
+from SwaggerPetstore.rest import ApiException
 
 HOST = 'http://petstore.swagger.io/v2'
 
@@ -62,11 +61,11 @@ class PetApiTests(unittest.TestCase):
         # same default api client
         self.assertEqual(pet_api.api_client, pet_api2.api_client)
         # confirm using the default api client in the config module
-        self.assertEqual(pet_api.api_client, config.api_client)
+        self.assertEqual(pet_api.api_client, SwaggerPetstore.configuration.api_client)
         # 2 different api clients are not the same
         self.assertNotEqual(api_client3, api_client4)
         # customized pet api not using the default api client
-        self.assertNotEqual(pet_api3.api_client, config.api_client)
+        self.assertNotEqual(pet_api3.api_client, SwaggerPetstore.configuration.api_client)
         # customized pet api not using the old pet api's api client
         self.assertNotEqual(pet_api3.api_client, pet_api2.api_client)
 
@@ -126,7 +125,7 @@ class PetApiTests(unittest.TestCase):
                 additional_metadata=additional_metadata,
                 file=self.foo
             )
-        except ErrorResponse as e:
+        except ApiException as e:
             self.fail("upload_file() raised {0} unexpectedly".format(type(e)))
 
     def test_delete_pet(self):
@@ -136,7 +135,7 @@ class PetApiTests(unittest.TestCase):
         try:
             self.pet_api.get_pet_by_id(pet_id=self.pet.id)
             raise "expected an error"
-        except ErrorResponse as e:
+        except ApiException as e:
             self.assertEqual(404, e.status)
 
 if __name__ == '__main__':