diff --git a/modules/openapi-generator/src/main/resources/python-flask/travis.mustache b/modules/openapi-generator/src/main/resources/python-flask/travis.mustache
index 167826e42b4..e03b816ecc0 100644
--- a/modules/openapi-generator/src/main/resources/python-flask/travis.mustache
+++ b/modules/openapi-generator/src/main/resources/python-flask/travis.mustache
@@ -8,8 +8,9 @@ python:
   - "3.3"
   - "3.4"
   - "3.5"
-  #- "3.5-dev" # 3.5 development branch
-  #- "nightly" # points to the latest development branch e.g. 3.6-dev
+  - "3.6"
+  - "3.7"
+  - "3.8"
 # command to install dependencies
 install: "pip install -r requirements.txt"
 # command to run tests
diff --git a/modules/openapi-generator/src/main/resources/python/travis.mustache b/modules/openapi-generator/src/main/resources/python/travis.mustache
index 86211e2d4a2..388de83128f 100644
--- a/modules/openapi-generator/src/main/resources/python/travis.mustache
+++ b/modules/openapi-generator/src/main/resources/python/travis.mustache
@@ -6,8 +6,9 @@ python:
   - "3.3"
   - "3.4"
   - "3.5"
-  #- "3.5-dev" # 3.5 development branch
-  #- "nightly" # points to the latest development branch e.g. 3.6-dev
+  - "3.6"
+  - "3.7"
+  - "3.8"
 # command to install dependencies
 install: "pip install -r requirements.txt"
 # command to run tests
diff --git a/samples/client/petstore/python-asyncio/.travis.yml b/samples/client/petstore/python-asyncio/.travis.yml
index 86211e2d4a2..388de83128f 100644
--- a/samples/client/petstore/python-asyncio/.travis.yml
+++ b/samples/client/petstore/python-asyncio/.travis.yml
@@ -6,8 +6,9 @@ python:
   - "3.3"
   - "3.4"
   - "3.5"
-  #- "3.5-dev" # 3.5 development branch
-  #- "nightly" # points to the latest development branch e.g. 3.6-dev
+  - "3.6"
+  - "3.7"
+  - "3.8"
 # command to install dependencies
 install: "pip install -r requirements.txt"
 # command to run tests
diff --git a/samples/client/petstore/python-experimental/.travis.yml b/samples/client/petstore/python-experimental/.travis.yml
index 86211e2d4a2..388de83128f 100644
--- a/samples/client/petstore/python-experimental/.travis.yml
+++ b/samples/client/petstore/python-experimental/.travis.yml
@@ -6,8 +6,9 @@ python:
   - "3.3"
   - "3.4"
   - "3.5"
-  #- "3.5-dev" # 3.5 development branch
-  #- "nightly" # points to the latest development branch e.g. 3.6-dev
+  - "3.6"
+  - "3.7"
+  - "3.8"
 # command to install dependencies
 install: "pip install -r requirements.txt"
 # command to run tests
diff --git a/samples/client/petstore/python-tornado/.travis.yml b/samples/client/petstore/python-tornado/.travis.yml
index 86211e2d4a2..388de83128f 100644
--- a/samples/client/petstore/python-tornado/.travis.yml
+++ b/samples/client/petstore/python-tornado/.travis.yml
@@ -6,8 +6,9 @@ python:
   - "3.3"
   - "3.4"
   - "3.5"
-  #- "3.5-dev" # 3.5 development branch
-  #- "nightly" # points to the latest development branch e.g. 3.6-dev
+  - "3.6"
+  - "3.7"
+  - "3.8"
 # command to install dependencies
 install: "pip install -r requirements.txt"
 # command to run tests
diff --git a/samples/client/petstore/python/.travis.yml b/samples/client/petstore/python/.travis.yml
index 86211e2d4a2..388de83128f 100644
--- a/samples/client/petstore/python/.travis.yml
+++ b/samples/client/petstore/python/.travis.yml
@@ -6,8 +6,9 @@ python:
   - "3.3"
   - "3.4"
   - "3.5"
-  #- "3.5-dev" # 3.5 development branch
-  #- "nightly" # points to the latest development branch e.g. 3.6-dev
+  - "3.6"
+  - "3.7"
+  - "3.8"
 # command to install dependencies
 install: "pip install -r requirements.txt"
 # command to run tests
diff --git a/samples/openapi3/client/petstore/python/.travis.yml b/samples/openapi3/client/petstore/python/.travis.yml
index 86211e2d4a2..388de83128f 100644
--- a/samples/openapi3/client/petstore/python/.travis.yml
+++ b/samples/openapi3/client/petstore/python/.travis.yml
@@ -6,8 +6,9 @@ python:
   - "3.3"
   - "3.4"
   - "3.5"
-  #- "3.5-dev" # 3.5 development branch
-  #- "nightly" # points to the latest development branch e.g. 3.6-dev
+  - "3.6"
+  - "3.7"
+  - "3.8"
 # command to install dependencies
 install: "pip install -r requirements.txt"
 # command to run tests
diff --git a/samples/openapi3/server/petstore/python-flask-python2/.openapi-generator/VERSION b/samples/openapi3/server/petstore/python-flask-python2/.openapi-generator/VERSION
index c3a2c7076fa..58592f031f6 100644
--- a/samples/openapi3/server/petstore/python-flask-python2/.openapi-generator/VERSION
+++ b/samples/openapi3/server/petstore/python-flask-python2/.openapi-generator/VERSION
@@ -1 +1 @@
-4.2.0-SNAPSHOT
\ No newline at end of file
+4.2.3-SNAPSHOT
\ No newline at end of file
diff --git a/samples/openapi3/server/petstore/python-flask-python2/.travis.yml b/samples/openapi3/server/petstore/python-flask-python2/.travis.yml
index 86211e2d4a2..388de83128f 100644
--- a/samples/openapi3/server/petstore/python-flask-python2/.travis.yml
+++ b/samples/openapi3/server/petstore/python-flask-python2/.travis.yml
@@ -6,8 +6,9 @@ python:
   - "3.3"
   - "3.4"
   - "3.5"
-  #- "3.5-dev" # 3.5 development branch
-  #- "nightly" # points to the latest development branch e.g. 3.6-dev
+  - "3.6"
+  - "3.7"
+  - "3.8"
 # command to install dependencies
 install: "pip install -r requirements.txt"
 # command to run tests
diff --git a/samples/openapi3/server/petstore/python-flask/.openapi-generator/VERSION b/samples/openapi3/server/petstore/python-flask/.openapi-generator/VERSION
index c3a2c7076fa..58592f031f6 100644
--- a/samples/openapi3/server/petstore/python-flask/.openapi-generator/VERSION
+++ b/samples/openapi3/server/petstore/python-flask/.openapi-generator/VERSION
@@ -1 +1 @@
-4.2.0-SNAPSHOT
\ No newline at end of file
+4.2.3-SNAPSHOT
\ No newline at end of file
diff --git a/samples/openapi3/server/petstore/python-flask/.travis.yml b/samples/openapi3/server/petstore/python-flask/.travis.yml
index dd6c4450aa9..ad71ee5ca08 100644
--- a/samples/openapi3/server/petstore/python-flask/.travis.yml
+++ b/samples/openapi3/server/petstore/python-flask/.travis.yml
@@ -5,8 +5,9 @@ python:
   - "3.3"
   - "3.4"
   - "3.5"
-  #- "3.5-dev" # 3.5 development branch
-  #- "nightly" # points to the latest development branch e.g. 3.6-dev
+  - "3.6"
+  - "3.7"
+  - "3.8"
 # command to install dependencies
 install: "pip install -r requirements.txt"
 # command to run tests
diff --git a/samples/server/petstore/python-aiohttp/.openapi-generator/VERSION b/samples/server/petstore/python-aiohttp/.openapi-generator/VERSION
index 0c89fc927e3..58592f031f6 100644
--- a/samples/server/petstore/python-aiohttp/.openapi-generator/VERSION
+++ b/samples/server/petstore/python-aiohttp/.openapi-generator/VERSION
@@ -1 +1 @@
-4.0.0
\ No newline at end of file
+4.2.3-SNAPSHOT
\ No newline at end of file
diff --git a/samples/server/petstore/python-aiohttp/tests/test_user_controller.py b/samples/server/petstore/python-aiohttp/tests/test_user_controller.py
index 307cab0fc7a..6564329315e 100644
--- a/samples/server/petstore/python-aiohttp/tests/test_user_controller.py
+++ b/samples/server/petstore/python-aiohttp/tests/test_user_controller.py
@@ -32,7 +32,7 @@ async def test_create_users_with_array_input(client):
 
     Creates list of users with given input array
     """
-    body = []
+    body = [{}]
     headers = { 
         'Content-Type': 'application/json',
     }
@@ -51,7 +51,7 @@ async def test_create_users_with_list_input(client):
 
     Creates list of users with given input array
     """
-    body = []
+    body = [{}]
     headers = { 
         'Content-Type': 'application/json',
     }
diff --git a/samples/server/petstore/python-flask-python2/.openapi-generator/VERSION b/samples/server/petstore/python-flask-python2/.openapi-generator/VERSION
index c3a2c7076fa..58592f031f6 100644
--- a/samples/server/petstore/python-flask-python2/.openapi-generator/VERSION
+++ b/samples/server/petstore/python-flask-python2/.openapi-generator/VERSION
@@ -1 +1 @@
-4.2.0-SNAPSHOT
\ No newline at end of file
+4.2.3-SNAPSHOT
\ No newline at end of file
diff --git a/samples/server/petstore/python-flask-python2/.travis.yml b/samples/server/petstore/python-flask-python2/.travis.yml
index 86211e2d4a2..388de83128f 100644
--- a/samples/server/petstore/python-flask-python2/.travis.yml
+++ b/samples/server/petstore/python-flask-python2/.travis.yml
@@ -6,8 +6,9 @@ python:
   - "3.3"
   - "3.4"
   - "3.5"
-  #- "3.5-dev" # 3.5 development branch
-  #- "nightly" # points to the latest development branch e.g. 3.6-dev
+  - "3.6"
+  - "3.7"
+  - "3.8"
 # command to install dependencies
 install: "pip install -r requirements.txt"
 # command to run tests
diff --git a/samples/server/petstore/python-flask/.openapi-generator/VERSION b/samples/server/petstore/python-flask/.openapi-generator/VERSION
index c3a2c7076fa..58592f031f6 100644
--- a/samples/server/petstore/python-flask/.openapi-generator/VERSION
+++ b/samples/server/petstore/python-flask/.openapi-generator/VERSION
@@ -1 +1 @@
-4.2.0-SNAPSHOT
\ No newline at end of file
+4.2.3-SNAPSHOT
\ No newline at end of file
diff --git a/samples/server/petstore/python-flask/.travis.yml b/samples/server/petstore/python-flask/.travis.yml
index dd6c4450aa9..ad71ee5ca08 100644
--- a/samples/server/petstore/python-flask/.travis.yml
+++ b/samples/server/petstore/python-flask/.travis.yml
@@ -5,8 +5,9 @@ python:
   - "3.3"
   - "3.4"
   - "3.5"
-  #- "3.5-dev" # 3.5 development branch
-  #- "nightly" # points to the latest development branch e.g. 3.6-dev
+  - "3.6"
+  - "3.7"
+  - "3.8"
 # command to install dependencies
 install: "pip install -r requirements.txt"
 # command to run tests