diff --git a/modules/swagger-codegen/src/main/resources/python/model.mustache b/modules/swagger-codegen/src/main/resources/python/model.mustache
index 7807d300c9f..d7c3493d9da 100644
--- a/modules/swagger-codegen/src/main/resources/python/model.mustache
+++ b/modules/swagger-codegen/src/main/resources/python/model.mustache
@@ -97,7 +97,7 @@ class {{classname}}(object):
                 ))
             elif isinstance(value, dict):
                 result[attr] = dict(map(
-                    lambda (k, v): (k, v.to_dict()) if hasattr(v, "to_dict") else (k, v),
+                    lambda k, v: (k, v.to_dict()) if hasattr(v, "to_dict") else (k, v),
                     value.iteritems()
                 ))
             elif hasattr(value, "to_dict"):
diff --git a/samples/client/petstore/python/swagger_client/models/category.py b/samples/client/petstore/python/swagger_client/models/category.py
index 08fff86fbaa..59970e0bc3f 100644
--- a/samples/client/petstore/python/swagger_client/models/category.py
+++ b/samples/client/petstore/python/swagger_client/models/category.py
@@ -108,7 +108,7 @@ class Category(object):
                 ))
             elif isinstance(value, dict):
                 result[attr] = dict(map(
-                    lambda (k, v): (k, v.to_dict()) if hasattr(v, "to_dict") else (k, v),
+                    lambda k, v: (k, v.to_dict()) if hasattr(v, "to_dict") else (k, v),
                     value.iteritems()
                 ))
             elif hasattr(value, "to_dict"):
diff --git a/samples/client/petstore/python/swagger_client/models/order.py b/samples/client/petstore/python/swagger_client/models/order.py
index ebf7c833a0b..488f01f05ba 100644
--- a/samples/client/petstore/python/swagger_client/models/order.py
+++ b/samples/client/petstore/python/swagger_client/models/order.py
@@ -214,7 +214,7 @@ class Order(object):
                 ))
             elif isinstance(value, dict):
                 result[attr] = dict(map(
-                    lambda (k, v): (k, v.to_dict()) if hasattr(v, "to_dict") else (k, v),
+                    lambda k, v: (k, v.to_dict()) if hasattr(v, "to_dict") else (k, v),
                     value.iteritems()
                 ))
             elif hasattr(value, "to_dict"):
diff --git a/samples/client/petstore/python/swagger_client/models/pet.py b/samples/client/petstore/python/swagger_client/models/pet.py
index 15eecdba32c..94ca2249c0a 100644
--- a/samples/client/petstore/python/swagger_client/models/pet.py
+++ b/samples/client/petstore/python/swagger_client/models/pet.py
@@ -214,7 +214,7 @@ class Pet(object):
                 ))
             elif isinstance(value, dict):
                 result[attr] = dict(map(
-                    lambda (k, v): (k, v.to_dict()) if hasattr(v, "to_dict") else (k, v),
+                    lambda k, v: (k, v.to_dict()) if hasattr(v, "to_dict") else (k, v),
                     value.iteritems()
                 ))
             elif hasattr(value, "to_dict"):
diff --git a/samples/client/petstore/python/swagger_client/models/tag.py b/samples/client/petstore/python/swagger_client/models/tag.py
index 9f8953d042e..4deced8a351 100644
--- a/samples/client/petstore/python/swagger_client/models/tag.py
+++ b/samples/client/petstore/python/swagger_client/models/tag.py
@@ -108,7 +108,7 @@ class Tag(object):
                 ))
             elif isinstance(value, dict):
                 result[attr] = dict(map(
-                    lambda (k, v): (k, v.to_dict()) if hasattr(v, "to_dict") else (k, v),
+                    lambda k, v: (k, v.to_dict()) if hasattr(v, "to_dict") else (k, v),
                     value.iteritems()
                 ))
             elif hasattr(value, "to_dict"):
diff --git a/samples/client/petstore/python/swagger_client/models/user.py b/samples/client/petstore/python/swagger_client/models/user.py
index e73c4a36eb9..f8c1012842a 100644
--- a/samples/client/petstore/python/swagger_client/models/user.py
+++ b/samples/client/petstore/python/swagger_client/models/user.py
@@ -258,7 +258,7 @@ class User(object):
                 ))
             elif isinstance(value, dict):
                 result[attr] = dict(map(
-                    lambda (k, v): (k, v.to_dict()) if hasattr(v, "to_dict") else (k, v),
+                    lambda k, v: (k, v.to_dict()) if hasattr(v, "to_dict") else (k, v),
                     value.iteritems()
                 ))
             elif hasattr(value, "to_dict"):