diff --git a/modules/openapi-generator/src/main/resources/python/gitlab-ci.mustache b/modules/openapi-generator/src/main/resources/python/gitlab-ci.mustache
index 28046fefa0c..2cabff63c78 100644
--- a/modules/openapi-generator/src/main/resources/python/gitlab-ci.mustache
+++ b/modules/openapi-generator/src/main/resources/python/gitlab-ci.mustache
@@ -7,8 +7,13 @@ stages:
   stage: test
   script:
    - pip install -r requirements.txt
-   - pip install nose
+   - pip install -r test-requirements.txt
+   {{#useNose}}
    - nosetests
+   {{/useNose}}
+   {{^useNose}}
+   - pytest --cov={{{packageName}}}
+   {{/useNose}}
 
 nosetest-2.7:
   extends: .nosetest
diff --git a/modules/openapi-generator/src/main/resources/python/travis.mustache b/modules/openapi-generator/src/main/resources/python/travis.mustache
index 388de83128f..195488737d6 100644
--- a/modules/openapi-generator/src/main/resources/python/travis.mustache
+++ b/modules/openapi-generator/src/main/resources/python/travis.mustache
@@ -10,6 +10,13 @@ python:
   - "3.7"
   - "3.8"
 # command to install dependencies
-install: "pip install -r requirements.txt"
+install:
+  - "pip install -r requirements.txt"
+  - "pip install -r test-requirements.txt"
 # command to run tests
+{{#useNose}}
 script: nosetests
+{{/useNose}}
+{{^useNose}}
+script: pytest --cov={{{packageName}}}
+{{/useNose}}
diff --git a/samples/client/petstore/python-asyncio/.gitlab-ci.yml b/samples/client/petstore/python-asyncio/.gitlab-ci.yml
index 28046fefa0c..142ce3712ed 100644
--- a/samples/client/petstore/python-asyncio/.gitlab-ci.yml
+++ b/samples/client/petstore/python-asyncio/.gitlab-ci.yml
@@ -7,8 +7,8 @@ stages:
   stage: test
   script:
    - pip install -r requirements.txt
-   - pip install nose
-   - nosetests
+   - pip install -r test-requirements.txt
+   - pytest --cov=petstore_api
 
 nosetest-2.7:
   extends: .nosetest
diff --git a/samples/client/petstore/python-asyncio/.travis.yml b/samples/client/petstore/python-asyncio/.travis.yml
index 388de83128f..fcd7e31c7cc 100644
--- a/samples/client/petstore/python-asyncio/.travis.yml
+++ b/samples/client/petstore/python-asyncio/.travis.yml
@@ -10,6 +10,8 @@ python:
   - "3.7"
   - "3.8"
 # command to install dependencies
-install: "pip install -r requirements.txt"
+install:
+  - "pip install -r requirements.txt"
+  - "pip install -r test-requirements.txt"
 # command to run tests
-script: nosetests
+script: pytest --cov=petstore_api
diff --git a/samples/client/petstore/python-experimental/.gitlab-ci.yml b/samples/client/petstore/python-experimental/.gitlab-ci.yml
index 28046fefa0c..142ce3712ed 100644
--- a/samples/client/petstore/python-experimental/.gitlab-ci.yml
+++ b/samples/client/petstore/python-experimental/.gitlab-ci.yml
@@ -7,8 +7,8 @@ stages:
   stage: test
   script:
    - pip install -r requirements.txt
-   - pip install nose
-   - nosetests
+   - pip install -r test-requirements.txt
+   - pytest --cov=petstore_api
 
 nosetest-2.7:
   extends: .nosetest
diff --git a/samples/client/petstore/python-experimental/.travis.yml b/samples/client/petstore/python-experimental/.travis.yml
index 388de83128f..fcd7e31c7cc 100644
--- a/samples/client/petstore/python-experimental/.travis.yml
+++ b/samples/client/petstore/python-experimental/.travis.yml
@@ -10,6 +10,8 @@ python:
   - "3.7"
   - "3.8"
 # command to install dependencies
-install: "pip install -r requirements.txt"
+install:
+  - "pip install -r requirements.txt"
+  - "pip install -r test-requirements.txt"
 # command to run tests
-script: nosetests
+script: pytest --cov=petstore_api
diff --git a/samples/client/petstore/python-tornado/.gitlab-ci.yml b/samples/client/petstore/python-tornado/.gitlab-ci.yml
index 28046fefa0c..142ce3712ed 100644
--- a/samples/client/petstore/python-tornado/.gitlab-ci.yml
+++ b/samples/client/petstore/python-tornado/.gitlab-ci.yml
@@ -7,8 +7,8 @@ stages:
   stage: test
   script:
    - pip install -r requirements.txt
-   - pip install nose
-   - nosetests
+   - pip install -r test-requirements.txt
+   - pytest --cov=petstore_api
 
 nosetest-2.7:
   extends: .nosetest
diff --git a/samples/client/petstore/python-tornado/.travis.yml b/samples/client/petstore/python-tornado/.travis.yml
index 388de83128f..fcd7e31c7cc 100644
--- a/samples/client/petstore/python-tornado/.travis.yml
+++ b/samples/client/petstore/python-tornado/.travis.yml
@@ -10,6 +10,8 @@ python:
   - "3.7"
   - "3.8"
 # command to install dependencies
-install: "pip install -r requirements.txt"
+install:
+  - "pip install -r requirements.txt"
+  - "pip install -r test-requirements.txt"
 # command to run tests
-script: nosetests
+script: pytest --cov=petstore_api
diff --git a/samples/client/petstore/python/.gitlab-ci.yml b/samples/client/petstore/python/.gitlab-ci.yml
index 28046fefa0c..142ce3712ed 100644
--- a/samples/client/petstore/python/.gitlab-ci.yml
+++ b/samples/client/petstore/python/.gitlab-ci.yml
@@ -7,8 +7,8 @@ stages:
   stage: test
   script:
    - pip install -r requirements.txt
-   - pip install nose
-   - nosetests
+   - pip install -r test-requirements.txt
+   - pytest --cov=petstore_api
 
 nosetest-2.7:
   extends: .nosetest
diff --git a/samples/client/petstore/python/.travis.yml b/samples/client/petstore/python/.travis.yml
index 388de83128f..fcd7e31c7cc 100644
--- a/samples/client/petstore/python/.travis.yml
+++ b/samples/client/petstore/python/.travis.yml
@@ -10,6 +10,8 @@ python:
   - "3.7"
   - "3.8"
 # command to install dependencies
-install: "pip install -r requirements.txt"
+install:
+  - "pip install -r requirements.txt"
+  - "pip install -r test-requirements.txt"
 # command to run tests
-script: nosetests
+script: pytest --cov=petstore_api
diff --git a/samples/openapi3/client/petstore/python-experimental/.gitlab-ci.yml b/samples/openapi3/client/petstore/python-experimental/.gitlab-ci.yml
index 28046fefa0c..142ce3712ed 100644
--- a/samples/openapi3/client/petstore/python-experimental/.gitlab-ci.yml
+++ b/samples/openapi3/client/petstore/python-experimental/.gitlab-ci.yml
@@ -7,8 +7,8 @@ stages:
   stage: test
   script:
    - pip install -r requirements.txt
-   - pip install nose
-   - nosetests
+   - pip install -r test-requirements.txt
+   - pytest --cov=petstore_api
 
 nosetest-2.7:
   extends: .nosetest
diff --git a/samples/openapi3/client/petstore/python-experimental/.travis.yml b/samples/openapi3/client/petstore/python-experimental/.travis.yml
index 388de83128f..fcd7e31c7cc 100644
--- a/samples/openapi3/client/petstore/python-experimental/.travis.yml
+++ b/samples/openapi3/client/petstore/python-experimental/.travis.yml
@@ -10,6 +10,8 @@ python:
   - "3.7"
   - "3.8"
 # command to install dependencies
-install: "pip install -r requirements.txt"
+install:
+  - "pip install -r requirements.txt"
+  - "pip install -r test-requirements.txt"
 # command to run tests
-script: nosetests
+script: pytest --cov=petstore_api
diff --git a/samples/openapi3/client/petstore/python/.gitlab-ci.yml b/samples/openapi3/client/petstore/python/.gitlab-ci.yml
index 28046fefa0c..142ce3712ed 100644
--- a/samples/openapi3/client/petstore/python/.gitlab-ci.yml
+++ b/samples/openapi3/client/petstore/python/.gitlab-ci.yml
@@ -7,8 +7,8 @@ stages:
   stage: test
   script:
    - pip install -r requirements.txt
-   - pip install nose
-   - nosetests
+   - pip install -r test-requirements.txt
+   - pytest --cov=petstore_api
 
 nosetest-2.7:
   extends: .nosetest
diff --git a/samples/openapi3/client/petstore/python/.travis.yml b/samples/openapi3/client/petstore/python/.travis.yml
index 388de83128f..fcd7e31c7cc 100644
--- a/samples/openapi3/client/petstore/python/.travis.yml
+++ b/samples/openapi3/client/petstore/python/.travis.yml
@@ -10,6 +10,8 @@ python:
   - "3.7"
   - "3.8"
 # command to install dependencies
-install: "pip install -r requirements.txt"
+install:
+  - "pip install -r requirements.txt"
+  - "pip install -r test-requirements.txt"
 # command to run tests
-script: nosetests
+script: pytest --cov=petstore_api