diff --git a/bin/python-server-all.sh b/bin/python-server-all.sh
index 5a4f5c75489..5fe3176eed9 100755
--- a/bin/python-server-all.sh
+++ b/bin/python-server-all.sh
@@ -3,3 +3,4 @@
 ./bin/python-server-aiohttp-petstore.sh
 ./bin/python-server-flask-petstore.sh
 ./bin/python-server-flask-petstore-python2.sh
+./bin/python-server-blueplanet-petstore.sh
diff --git a/docs/generators/python-aiohttp.md b/docs/generators/python-aiohttp.md
index 16a4fc8056f..a116fc6e96b 100644
--- a/docs/generators/python-aiohttp.md
+++ b/docs/generators/python-aiohttp.md
@@ -16,3 +16,4 @@ sidebar_label: python-aiohttp
 |defaultController|default controller| |default_controller|
 |supportPython2|support python2| |false|
 |serverPort|TCP port to listen to in app.run| |8080|
+|useNose|use the nose test framework| |false|
diff --git a/docs/generators/python-blueplanet.md b/docs/generators/python-blueplanet.md
index 21891902860..7114953628d 100644
--- a/docs/generators/python-blueplanet.md
+++ b/docs/generators/python-blueplanet.md
@@ -16,3 +16,4 @@ sidebar_label: python-blueplanet
 |defaultController|default controller| |default_controller|
 |supportPython2|support python2| |false|
 |serverPort|TCP port to listen to in app.run| |8080|
+|useNose|use the nose test framework| |false|
diff --git a/docs/generators/python-experimental.md b/docs/generators/python-experimental.md
index 65aaee19857..8ba2d699ed5 100644
--- a/docs/generators/python-experimental.md
+++ b/docs/generators/python-experimental.md
@@ -12,4 +12,5 @@ sidebar_label: python-experimental
 |sortParamsByRequiredFlag|Sort method arguments to place required parameters before optional parameters.| |true|
 |hideGenerationTimestamp|Hides the generation timestamp when files are generated.| |true|
 |generateSourceCodeOnly|Specifies that only a library source code is to be generated.| |false|
+|useNose|use the nose test framework| |false|
 |library|library template (sub-template) to use: asyncio, tornado, urllib3| |urllib3|
diff --git a/docs/generators/python-flask.md b/docs/generators/python-flask.md
index 05f6e46a1c6..1b68530a868 100644
--- a/docs/generators/python-flask.md
+++ b/docs/generators/python-flask.md
@@ -16,3 +16,4 @@ sidebar_label: python-flask
 |defaultController|default controller| |default_controller|
 |supportPython2|support python2| |false|
 |serverPort|TCP port to listen to in app.run| |8080|
+|useNose|use the nose test framework| |false|
diff --git a/docs/generators/python.md b/docs/generators/python.md
index 023e92b6671..ee581848b02 100644
--- a/docs/generators/python.md
+++ b/docs/generators/python.md
@@ -12,4 +12,5 @@ sidebar_label: python
 |sortParamsByRequiredFlag|Sort method arguments to place required parameters before optional parameters.| |true|
 |hideGenerationTimestamp|Hides the generation timestamp when files are generated.| |true|
 |generateSourceCodeOnly|Specifies that only a library source code is to be generated.| |false|
+|useNose|use the nose test framework| |false|
 |library|library template (sub-template) to use: asyncio, tornado, urllib3| |urllib3|
diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/PythonAbstractConnexionServerCodegen.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/PythonAbstractConnexionServerCodegen.java
index 5d6c5ca102e..5b6e133cac2 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/PythonAbstractConnexionServerCodegen.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/PythonAbstractConnexionServerCodegen.java
@@ -48,6 +48,8 @@ public class PythonAbstractConnexionServerCodegen extends DefaultCodegen impleme
     public static final String CONTROLLER_PACKAGE = "controllerPackage";
     public static final String DEFAULT_CONTROLLER = "defaultController";
     public static final String SUPPORT_PYTHON2 = "supportPython2";
+    // nose is a python testing framework, we use pytest if USE_NOSE is unset
+    public static final String USE_NOSE = "useNose";
     static final String MEDIA_TYPE = "mediaType";
 
     protected int serverPort = 8080;
@@ -57,6 +59,7 @@ public class PythonAbstractConnexionServerCodegen extends DefaultCodegen impleme
     protected String defaultController;
     protected Map<Character, String> regexModifiers;
     protected boolean fixBodyName;
+    protected boolean useNose = Boolean.FALSE;
 
     public PythonAbstractConnexionServerCodegen(String templateDirectory, boolean fixBodyNameValue) {
         super();
@@ -156,6 +159,8 @@ public class PythonAbstractConnexionServerCodegen extends DefaultCodegen impleme
                 defaultValue("false"));
         cliOptions.add(new CliOption("serverPort", "TCP port to listen to in app.run").
                 defaultValue("8080"));
+        cliOptions.add(CliOption.newBoolean(USE_NOSE, "use the nose test framework").
+                defaultValue(Boolean.FALSE.toString()));
     }
 
     protected void addSupportingFiles() {
@@ -200,6 +205,9 @@ public class PythonAbstractConnexionServerCodegen extends DefaultCodegen impleme
             additionalProperties.put(SUPPORT_PYTHON2, Boolean.TRUE);
             typeMapping.put("long", "long");
         }
+        if (additionalProperties.containsKey(USE_NOSE)) {
+            setUseNose((String) additionalProperties.get(USE_NOSE));
+        }
         supportingFiles.add(new SupportingFile("__main__.mustache", packagePath(), "__main__.py"));
         supportingFiles.add(new SupportingFile("util.mustache", packagePath(), "util.py"));
         supportingFiles.add(new SupportingFile("typing_utils.mustache", packagePath(), "typing_utils.py"));
@@ -214,6 +222,10 @@ public class PythonAbstractConnexionServerCodegen extends DefaultCodegen impleme
         controllerPackage = packageName + "." + controllerPackage;
     }
 
+    public void setUseNose(String val) {
+        this.useNose = Boolean.valueOf(val);
+    }
+
     private static String packageToPath(String pkg) {
         return pkg.replace(".", File.separator);
     }
diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/PythonAiohttpConnexionServerCodegen.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/PythonAiohttpConnexionServerCodegen.java
index 0f725396b66..eac3c6b0b2e 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/PythonAiohttpConnexionServerCodegen.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/PythonAiohttpConnexionServerCodegen.java
@@ -44,5 +44,7 @@ public class PythonAiohttpConnexionServerCodegen extends PythonAbstractConnexion
         supportingFiles.add(new SupportingFile("conftest.mustache", testPackage, "conftest.py"));
         supportingFiles.add(new SupportingFile("__init__test.mustache", testPackage, "__init__.py"));
         supportingFiles.add(new SupportingFile("__init__main.mustache", packagePath(), "__init__.py"));
+        supportingFiles.add(new SupportingFile("tox.mustache", "", "tox.ini"));
+        supportingFiles.add(new SupportingFile("gitignore.mustache", "", ".gitignore"));
     }
 }
diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/PythonClientCodegen.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/PythonClientCodegen.java
index 4538ee1b5f2..ef410594ec9 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/PythonClientCodegen.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/PythonClientCodegen.java
@@ -40,6 +40,8 @@ public class PythonClientCodegen extends DefaultCodegen implements CodegenConfig
 
     public static final String PACKAGE_URL = "packageUrl";
     public static final String DEFAULT_LIBRARY = "urllib3";
+    // nose is a python testing framework, we use pytest if USE_NOSE is unset
+    public static final String USE_NOSE = "useNose";
 
     protected String packageName = "openapi_client";
     protected String packageVersion = "1.0.0";
@@ -47,6 +49,7 @@ public class PythonClientCodegen extends DefaultCodegen implements CodegenConfig
     protected String packageUrl;
     protected String apiDocPath = "docs/";
     protected String modelDocPath = "docs/";
+    protected boolean useNose = Boolean.FALSE;
 
     protected Map<Character, String> regexModifiers;
 
@@ -127,7 +130,7 @@ public class PythonClientCodegen extends DefaultCodegen implements CodegenConfig
                         "and", "del", "from", "not", "while", "as", "elif", "global", "or", "with",
                         "assert", "else", "if", "pass", "yield", "break", "except", "import",
                         "print", "class", "exec", "in", "raise", "continue", "finally", "is",
-                        "return", "def", "for", "lambda", "try", "self", "nonlocal", "None", "True", 
+                        "return", "def", "for", "lambda", "try", "self", "nonlocal", "None", "True",
                         "False", "async", "await"));
 
         regexModifiers = new HashMap<Character, String>();
@@ -151,6 +154,8 @@ public class PythonClientCodegen extends DefaultCodegen implements CodegenConfig
                 .defaultValue(Boolean.TRUE.toString()));
         cliOptions.add(new CliOption(CodegenConstants.SOURCECODEONLY_GENERATION, CodegenConstants.SOURCECODEONLY_GENERATION_DESC)
                 .defaultValue(Boolean.FALSE.toString()));
+        cliOptions.add(CliOption.newBoolean(USE_NOSE, "use the nose test framework").
+                defaultValue(Boolean.FALSE.toString()));
 
         supportedLibraries.put("urllib3", "urllib3-based client");
         supportedLibraries.put("asyncio", "Asyncio-based client (python 3.5+)");
@@ -190,7 +195,7 @@ public class PythonClientCodegen extends DefaultCodegen implements CodegenConfig
 
         if (additionalProperties.containsKey(CodegenConstants.PACKAGE_VERSION)) {
             setPackageVersion((String) additionalProperties.get(CodegenConstants.PACKAGE_VERSION));
-        } 
+        }
 
         Boolean generateSourceCodeOnly = false;
         if (additionalProperties.containsKey(CodegenConstants.SOURCECODEONLY_GENERATION)) {
@@ -216,6 +221,10 @@ public class PythonClientCodegen extends DefaultCodegen implements CodegenConfig
             setPackageUrl((String) additionalProperties.get(PACKAGE_URL));
         }
 
+        if (additionalProperties.containsKey(USE_NOSE)) {
+            setUseNose((String) additionalProperties.get(USE_NOSE));
+        }
+
         String readmePath = "README.md";
         String readmeTemplate = "README.mustache";
         if (generateSourceCodeOnly) {
@@ -228,6 +237,7 @@ public class PythonClientCodegen extends DefaultCodegen implements CodegenConfig
             supportingFiles.add(new SupportingFile("tox.mustache", "", "tox.ini"));
             supportingFiles.add(new SupportingFile("test-requirements.mustache", "", "test-requirements.txt"));
             supportingFiles.add(new SupportingFile("requirements.mustache", "", "requirements.txt"));
+            supportingFiles.add(new SupportingFile("setup_cfg.mustache", "", "setup.cfg"));
 
             supportingFiles.add(new SupportingFile("git_push.sh.mustache", "", "git_push.sh"));
             supportingFiles.add(new SupportingFile("gitignore.mustache", "", ".gitignore"));
@@ -579,6 +589,10 @@ public class PythonClientCodegen extends DefaultCodegen implements CodegenConfig
         this.packageName = packageName;
     }
 
+    public void setUseNose(String val) {
+        this.useNose = Boolean.valueOf(val);
+    }
+
     public void setProjectName(String projectName) {
         this.projectName = projectName;
     }
diff --git a/modules/openapi-generator/src/main/resources/python-aiohttp/gitignore.mustache b/modules/openapi-generator/src/main/resources/python-aiohttp/gitignore.mustache
new file mode 100644
index 00000000000..43995bd42fa
--- /dev/null
+++ b/modules/openapi-generator/src/main/resources/python-aiohttp/gitignore.mustache
@@ -0,0 +1,66 @@
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+env/
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+*.egg-info/
+.installed.cfg
+*.egg
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*,cover
+.hypothesis/
+venv/
+.venv/
+.python-version
+.pytest_cache
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+target/
+
+#Ipython Notebook
+.ipynb_checkpoints
diff --git a/modules/openapi-generator/src/main/resources/python-aiohttp/test-requirements.mustache b/modules/openapi-generator/src/main/resources/python-aiohttp/test-requirements.mustache
index 1cb425f6551..16ba4a48111 100644
--- a/modules/openapi-generator/src/main/resources/python-aiohttp/test-requirements.mustache
+++ b/modules/openapi-generator/src/main/resources/python-aiohttp/test-requirements.mustache
@@ -1,6 +1,13 @@
+{{#useNose}}
 coverage>=4.0.3
-pytest>=1.3.7
+nose>=1.3.7
 pluggy>=0.3.1
 py>=1.4.31
 randomize>=0.13
+{{/useNose}}
+{{^useNose}}
+pytest~=4.6.7 # needed for python 2.7+3.4
+pytest-cov>=2.8.1
+pytest-randomly==1.2.3 # needed for python 2.7+3.4
 pytest-aiohttp>=0.3.0
+{{/useNose}}
\ No newline at end of file
diff --git a/modules/openapi-generator/src/main/resources/python-aiohttp/tox.mustache b/modules/openapi-generator/src/main/resources/python-aiohttp/tox.mustache
new file mode 100644
index 00000000000..87cc65eeeb7
--- /dev/null
+++ b/modules/openapi-generator/src/main/resources/python-aiohttp/tox.mustache
@@ -0,0 +1,10 @@
+[tox]
+envlist = py3
+skipsdist=True
+
+[testenv]
+deps=-r{toxinidir}/requirements.txt
+     -r{toxinidir}/test-requirements.txt
+
+commands=
+   {{^useNose}}pytest --cov={{{packageName}}}{{/useNose}}{{#useNose}}nosetests{{/useNose}}
\ No newline at end of file
diff --git a/modules/openapi-generator/src/main/resources/python-blueplanet/app/gitignore.mustache b/modules/openapi-generator/src/main/resources/python-blueplanet/app/gitignore.mustache
index a655050c263..a77a0ebd166 100644
--- a/modules/openapi-generator/src/main/resources/python-blueplanet/app/gitignore.mustache
+++ b/modules/openapi-generator/src/main/resources/python-blueplanet/app/gitignore.mustache
@@ -46,6 +46,7 @@ coverage.xml
 .hypothesis/
 venv/
 .python-version
+.pytest_cache
 
 # Translations
 *.mo
diff --git a/modules/openapi-generator/src/main/resources/python-blueplanet/app/test-requirements.mustache b/modules/openapi-generator/src/main/resources/python-blueplanet/app/test-requirements.mustache
index 7f8d96e6b40..efad5423cb5 100644
--- a/modules/openapi-generator/src/main/resources/python-blueplanet/app/test-requirements.mustache
+++ b/modules/openapi-generator/src/main/resources/python-blueplanet/app/test-requirements.mustache
@@ -1,6 +1,13 @@
-flask_testing==0.6.1
+{{#useNose}}
 coverage>=4.0.3
 nose>=1.3.7
 pluggy>=0.3.1
 py>=1.4.31
 randomize>=0.13
+{{/useNose}}
+{{^useNose}}
+pytest~=4.6.7 # needed for python 2.7+3.4
+pytest-cov>=2.8.1
+pytest-randomly==1.2.3 # needed for python 2.7+3.4
+{{/useNose}}
+flask_testing==0.6.1
\ No newline at end of file
diff --git a/modules/openapi-generator/src/main/resources/python-blueplanet/app/tox.mustache b/modules/openapi-generator/src/main/resources/python-blueplanet/app/tox.mustache
index 3efa994317d..7b3246c36e2 100644
--- a/modules/openapi-generator/src/main/resources/python-blueplanet/app/tox.mustache
+++ b/modules/openapi-generator/src/main/resources/python-blueplanet/app/tox.mustache
@@ -6,5 +6,4 @@ deps=-r{toxinidir}/requirements.txt
      -r{toxinidir}/test-requirements.txt
 
 commands=
-   nosetests \
-      []
\ No newline at end of file
+   {{^useNose}}pytest --cov={{{packageName}}}{{/useNose}}{{#useNose}}nosetests{{/useNose}}
\ No newline at end of file
diff --git a/modules/openapi-generator/src/main/resources/python-flask/gitignore.mustache b/modules/openapi-generator/src/main/resources/python-flask/gitignore.mustache
index a655050c263..43995bd42fa 100644
--- a/modules/openapi-generator/src/main/resources/python-flask/gitignore.mustache
+++ b/modules/openapi-generator/src/main/resources/python-flask/gitignore.mustache
@@ -45,7 +45,9 @@ coverage.xml
 *,cover
 .hypothesis/
 venv/
+.venv/
 .python-version
+.pytest_cache
 
 # Translations
 *.mo
diff --git a/modules/openapi-generator/src/main/resources/python-flask/requirements.mustache b/modules/openapi-generator/src/main/resources/python-flask/requirements.mustache
index b5a702d5de8..921d67d029a 100644
--- a/modules/openapi-generator/src/main/resources/python-flask/requirements.mustache
+++ b/modules/openapi-generator/src/main/resources/python-flask/requirements.mustache
@@ -1,4 +1,7 @@
-connexion >= 2.0.2
+connexion >= 2.5.0; python_version>="3.6"
+connexion >= 2.3.0; python_version=="3.5"
+connexion >= 2.3.0; python_version=="3.4"
+connexion == 2.4.0; python_version<="2.7"
 swagger-ui-bundle >= 0.0.2
 python_dateutil >= 2.6.0
 {{#supportPython2}}
diff --git a/modules/openapi-generator/src/main/resources/python-flask/test-requirements.mustache b/modules/openapi-generator/src/main/resources/python-flask/test-requirements.mustache
index 7f8d96e6b40..efad5423cb5 100644
--- a/modules/openapi-generator/src/main/resources/python-flask/test-requirements.mustache
+++ b/modules/openapi-generator/src/main/resources/python-flask/test-requirements.mustache
@@ -1,6 +1,13 @@
-flask_testing==0.6.1
+{{#useNose}}
 coverage>=4.0.3
 nose>=1.3.7
 pluggy>=0.3.1
 py>=1.4.31
 randomize>=0.13
+{{/useNose}}
+{{^useNose}}
+pytest~=4.6.7 # needed for python 2.7+3.4
+pytest-cov>=2.8.1
+pytest-randomly==1.2.3 # needed for python 2.7+3.4
+{{/useNose}}
+flask_testing==0.6.1
\ No newline at end of file
diff --git a/modules/openapi-generator/src/main/resources/python-flask/tox.mustache b/modules/openapi-generator/src/main/resources/python-flask/tox.mustache
index 1195b3391b0..7fcd185a8d8 100644
--- a/modules/openapi-generator/src/main/resources/python-flask/tox.mustache
+++ b/modules/openapi-generator/src/main/resources/python-flask/tox.mustache
@@ -6,5 +6,4 @@ deps=-r{toxinidir}/requirements.txt
      -r{toxinidir}/test-requirements.txt
 
 commands=
-   nosetests \
-      []
\ No newline at end of file
+   {{^useNose}}pytest --cov={{{packageName}}}{{/useNose}}{{#useNose}}nosetests{{/useNose}}
\ No newline at end of file
diff --git a/modules/openapi-generator/src/main/resources/python/gitignore.mustache b/modules/openapi-generator/src/main/resources/python/gitignore.mustache
index a655050c263..43995bd42fa 100644
--- a/modules/openapi-generator/src/main/resources/python/gitignore.mustache
+++ b/modules/openapi-generator/src/main/resources/python/gitignore.mustache
@@ -45,7 +45,9 @@ coverage.xml
 *,cover
 .hypothesis/
 venv/
+.venv/
 .python-version
+.pytest_cache
 
 # Translations
 *.mo
diff --git a/modules/openapi-generator/src/main/resources/python/python-experimental/test-requirements.mustache b/modules/openapi-generator/src/main/resources/python/python-experimental/test-requirements.mustache
index 023ff960788..338b229bae5 100644
--- a/modules/openapi-generator/src/main/resources/python/python-experimental/test-requirements.mustache
+++ b/modules/openapi-generator/src/main/resources/python/python-experimental/test-requirements.mustache
@@ -1,13 +1,13 @@
-{{^asyncio}}
+{{#useNose}}
 coverage>=4.0.3
 nose>=1.3.7
-{{/asyncio}}
-{{#asyncio}}
-pytest>=3.6.0
-pytest-cov>=2.6.1
-{{/asyncio}}
 pluggy>=0.3.1
 py>=1.4.31
 randomize>=0.13
-mock; python_version<="2.7"
-
+{{/useNose}}
+{{^useNose}}
+pytest~=4.6.7 # needed for python 2.7+3.4
+pytest-cov>=2.8.1
+pytest-randomly==1.2.3 # needed for python 2.7+3.4
+{{/useNose}}
+mock; python_version<="2.7"
\ No newline at end of file
diff --git a/modules/openapi-generator/src/main/resources/python/setup_cfg.mustache b/modules/openapi-generator/src/main/resources/python/setup_cfg.mustache
new file mode 100644
index 00000000000..d89aa72ee4c
--- /dev/null
+++ b/modules/openapi-generator/src/main/resources/python/setup_cfg.mustache
@@ -0,0 +1,13 @@
+{{#useNose}}
+[nosetests]
+logging-clear-handlers=true
+verbosity=2
+randomize=true
+exe=true
+with-coverage=true
+cover-package=petstore_api
+cover-erase=true
+
+{{/useNose}}
+[flake8]
+max-line-length=99
diff --git a/modules/openapi-generator/src/main/resources/python/test-requirements.mustache b/modules/openapi-generator/src/main/resources/python/test-requirements.mustache
index d9e3f20b536..12021b47a1c 100644
--- a/modules/openapi-generator/src/main/resources/python/test-requirements.mustache
+++ b/modules/openapi-generator/src/main/resources/python/test-requirements.mustache
@@ -1,11 +1,12 @@
-{{^asyncio}}
+{{#useNose}}
 coverage>=4.0.3
 nose>=1.3.7
-{{/asyncio}}
-{{#asyncio}}
-pytest>=3.6.0
-pytest-cov>=2.6.1
-{{/asyncio}}
 pluggy>=0.3.1
 py>=1.4.31
 randomize>=0.13
+{{/useNose}}
+{{^useNose}}
+pytest~=4.6.7 # needed for python 2.7+3.4
+pytest-cov>=2.8.1
+pytest-randomly==1.2.3 # needed for python 2.7+3.4
+{{/useNose}}
\ No newline at end of file
diff --git a/modules/openapi-generator/src/main/resources/python/tox.mustache b/modules/openapi-generator/src/main/resources/python/tox.mustache
index 585feb3c681..fe989faf930 100644
--- a/modules/openapi-generator/src/main/resources/python/tox.mustache
+++ b/modules/openapi-generator/src/main/resources/python/tox.mustache
@@ -11,10 +11,4 @@ deps=-r{toxinidir}/requirements.txt
      -r{toxinidir}/test-requirements.txt
 
 commands=
-{{^asyncio}}
-   nosetests \
-      []
-{{/asyncio}}
-{{#asyncio}}
-   pytest -v --cov {{{packageName}}}
-{{/asyncio}}
+   {{^useNose}}pytest --cov={{{packageName}}}{{/useNose}}{{#useNose}}nosetests{{/useNose}}
diff --git a/modules/openapi-generator/src/test/java/org/openapitools/codegen/options/PythonClientOptionsProvider.java b/modules/openapi-generator/src/test/java/org/openapitools/codegen/options/PythonClientOptionsProvider.java
index f74b17266ce..d3afcc8f844 100644
--- a/modules/openapi-generator/src/test/java/org/openapitools/codegen/options/PythonClientOptionsProvider.java
+++ b/modules/openapi-generator/src/test/java/org/openapitools/codegen/options/PythonClientOptionsProvider.java
@@ -28,6 +28,7 @@ public class PythonClientOptionsProvider implements OptionsProvider {
     public static final String PROJECT_NAME_VALUE = "swagger-client-python";
     public static final String PACKAGE_VERSION_VALUE = "1.0.0-SNAPSHOT";
     public static final String PACKAGE_URL_VALUE = "";
+    public static final String USE_NOSE_VALUE = "false";
 
     @Override
     public String getLanguage() {
@@ -45,6 +46,7 @@ public class PythonClientOptionsProvider implements OptionsProvider {
                 .put(CodegenConstants.HIDE_GENERATION_TIMESTAMP, "true")
                 .put(CodegenConstants.SOURCECODEONLY_GENERATION, "false")
                 .put(CodegenConstants.LIBRARY, "urllib3")
+                .put(PythonClientCodegen.USE_NOSE, USE_NOSE_VALUE)
                 .build();
     }
 
diff --git a/modules/openapi-generator/src/test/java/org/openapitools/codegen/python/PythonClientOptionsTest.java b/modules/openapi-generator/src/test/java/org/openapitools/codegen/python/PythonClientOptionsTest.java
index 47d59ba78c4..ce9d564f470 100644
--- a/modules/openapi-generator/src/test/java/org/openapitools/codegen/python/PythonClientOptionsTest.java
+++ b/modules/openapi-generator/src/test/java/org/openapitools/codegen/python/PythonClientOptionsTest.java
@@ -56,6 +56,9 @@ public class PythonClientOptionsTest extends AbstractOptionsTest {
             clientCodegen.setPackageUrl(PythonClientOptionsProvider.PACKAGE_URL_VALUE);
             times = 1;
 
+            clientCodegen.setUseNose(PythonClientOptionsProvider.USE_NOSE_VALUE);
+            times = 1;
+
             clientCodegen.packagePath();
             result = PythonClientOptionsProvider.PACKAGE_NAME_VALUE.replace('.', File.separatorChar);
             minTimes = 1;
diff --git a/samples/client/petstore/python-asyncio/.gitignore b/samples/client/petstore/python-asyncio/.gitignore
index a655050c263..43995bd42fa 100644
--- a/samples/client/petstore/python-asyncio/.gitignore
+++ b/samples/client/petstore/python-asyncio/.gitignore
@@ -45,7 +45,9 @@ coverage.xml
 *,cover
 .hypothesis/
 venv/
+.venv/
 .python-version
+.pytest_cache
 
 # Translations
 *.mo
diff --git a/samples/client/petstore/python-asyncio/dev-requirements.txt b/samples/client/petstore/python-asyncio/dev-requirements.txt
index 49182426e20..ccdfca62949 100644
--- a/samples/client/petstore/python-asyncio/dev-requirements.txt
+++ b/samples/client/petstore/python-asyncio/dev-requirements.txt
@@ -1,4 +1,2 @@
 tox
-coverage
-randomize
 flake8
diff --git a/samples/client/petstore/python-asyncio/setup.cfg b/samples/client/petstore/python-asyncio/setup.cfg
new file mode 100644
index 00000000000..11433ee875a
--- /dev/null
+++ b/samples/client/petstore/python-asyncio/setup.cfg
@@ -0,0 +1,2 @@
+[flake8]
+max-line-length=99
diff --git a/samples/client/petstore/python-asyncio/test-requirements.txt b/samples/client/petstore/python-asyncio/test-requirements.txt
index 600ac897bb7..4ed3991cbec 100644
--- a/samples/client/petstore/python-asyncio/test-requirements.txt
+++ b/samples/client/petstore/python-asyncio/test-requirements.txt
@@ -1,5 +1,3 @@
-pytest>=3.6.0
-pytest-cov>=2.6.1
-pluggy>=0.3.1
-py>=1.4.31
-randomize>=0.13
+pytest~=4.6.7 # needed for python 2.7+3.4
+pytest-cov>=2.8.1
+pytest-randomly==1.2.3 # needed for python 2.7+3.4
diff --git a/samples/client/petstore/python-asyncio/test_python3.sh b/samples/client/petstore/python-asyncio/test_python3.sh
index 9160e25714a..1a8e712f73c 100755
--- a/samples/client/petstore/python-asyncio/test_python3.sh
+++ b/samples/client/petstore/python-asyncio/test_python3.sh
@@ -18,7 +18,6 @@ fi
 
 ### install dependencies
 pip install -r $REQUIREMENTS_FILE | tee -a $REQUIREMENTS_OUT
-python setup.py develop
 
 ### run tests
 tox || exit 1
diff --git a/samples/client/petstore/python-asyncio/tox.ini b/samples/client/petstore/python-asyncio/tox.ini
index 65f5351ddcc..8989fc3c4d9 100644
--- a/samples/client/petstore/python-asyncio/tox.ini
+++ b/samples/client/petstore/python-asyncio/tox.ini
@@ -6,4 +6,4 @@ deps=-r{toxinidir}/requirements.txt
      -r{toxinidir}/test-requirements.txt
 
 commands=
-   pytest -v --cov petstore_api
+   pytest --cov=petstore_api
diff --git a/samples/client/petstore/python-experimental/.gitignore b/samples/client/petstore/python-experimental/.gitignore
index a655050c263..43995bd42fa 100644
--- a/samples/client/petstore/python-experimental/.gitignore
+++ b/samples/client/petstore/python-experimental/.gitignore
@@ -45,7 +45,9 @@ coverage.xml
 *,cover
 .hypothesis/
 venv/
+.venv/
 .python-version
+.pytest_cache
 
 # Translations
 *.mo
diff --git a/samples/client/petstore/python-experimental/dev-requirements.txt b/samples/client/petstore/python-experimental/dev-requirements.txt
index f50c13b5c50..ccdfca62949 100644
--- a/samples/client/petstore/python-experimental/dev-requirements.txt
+++ b/samples/client/petstore/python-experimental/dev-requirements.txt
@@ -1,5 +1,2 @@
-nose
 tox
-coverage
-randomize
 flake8
diff --git a/samples/client/petstore/python-experimental/pom.xml b/samples/client/petstore/python-experimental/pom.xml
index 3c946333186..742451c23b2 100644
--- a/samples/client/petstore/python-experimental/pom.xml
+++ b/samples/client/petstore/python-experimental/pom.xml
@@ -27,7 +27,7 @@
                 <version>1.2.1</version>
                 <executions>
                     <execution>
-                        <id>nose-test</id>
+                        <id>test</id>
                         <phase>integration-test</phase>
                         <goals>
                             <goal>exec</goal>
diff --git a/samples/client/petstore/python-experimental/setup.cfg b/samples/client/petstore/python-experimental/setup.cfg
index 26b7a359d58..11433ee875a 100644
--- a/samples/client/petstore/python-experimental/setup.cfg
+++ b/samples/client/petstore/python-experimental/setup.cfg
@@ -1,11 +1,2 @@
-[nosetests]
-logging-clear-handlers=true
-verbosity=2
-randomize=true
-exe=true
-with-coverage=true
-cover-package=petstore_api
-cover-erase=true
-
 [flake8]
 max-line-length=99
diff --git a/samples/client/petstore/python-experimental/test-requirements.txt b/samples/client/petstore/python-experimental/test-requirements.txt
index 5816b874953..06f7754d204 100644
--- a/samples/client/petstore/python-experimental/test-requirements.txt
+++ b/samples/client/petstore/python-experimental/test-requirements.txt
@@ -1,7 +1,4 @@
-coverage>=4.0.3
-nose>=1.3.7
-pluggy>=0.3.1
-py>=1.4.31
-randomize>=0.13
-mock; python_version<="2.7"
-
+pytest~=4.6.7 # needed for python 2.7+3.4
+pytest-cov>=2.8.1
+pytest-randomly==1.2.3 # needed for python 2.7+3.4
+mock; python_version<="2.7"
\ No newline at end of file
diff --git a/samples/client/petstore/python-experimental/test_python2.sh b/samples/client/petstore/python-experimental/test_python2.sh
index 35de07deec7..b2f344ec897 100644
--- a/samples/client/petstore/python-experimental/test_python2.sh
+++ b/samples/client/petstore/python-experimental/test_python2.sh
@@ -19,11 +19,9 @@ fi
 
 ### install dependencies
 pip install -r $REQUIREMENTS_FILE | tee -a $REQUIREMENTS_OUT
-pip install -r test-requirements.txt
-python setup.py develop
 
 ### run tests
-nosetests || exit 1
+tox -e py27 || exit 1
 
 ### static analysis of code
 flake8 --show-source petstore_api/
diff --git a/samples/client/petstore/python-experimental/test_python2_and_3.sh b/samples/client/petstore/python-experimental/test_python2_and_3.sh
index 8511d46cd79..3205dfd07da 100644
--- a/samples/client/petstore/python-experimental/test_python2_and_3.sh
+++ b/samples/client/petstore/python-experimental/test_python2_and_3.sh
@@ -18,7 +18,6 @@ fi
 
 ### install dependencies
 pip install -r $REQUIREMENTS_FILE | tee -a $REQUIREMENTS_OUT
-python setup.py develop
 
 ### run tests
 tox || exit 1
diff --git a/samples/client/petstore/python-experimental/tox.ini b/samples/client/petstore/python-experimental/tox.ini
index 3d0be613cfc..169d895329b 100644
--- a/samples/client/petstore/python-experimental/tox.ini
+++ b/samples/client/petstore/python-experimental/tox.ini
@@ -6,5 +6,4 @@ deps=-r{toxinidir}/requirements.txt
      -r{toxinidir}/test-requirements.txt
 
 commands=
-   nosetests \
-      []
+   pytest --cov=petstore_api
diff --git a/samples/client/petstore/python-tornado/.gitignore b/samples/client/petstore/python-tornado/.gitignore
index a655050c263..43995bd42fa 100644
--- a/samples/client/petstore/python-tornado/.gitignore
+++ b/samples/client/petstore/python-tornado/.gitignore
@@ -45,7 +45,9 @@ coverage.xml
 *,cover
 .hypothesis/
 venv/
+.venv/
 .python-version
+.pytest_cache
 
 # Translations
 *.mo
diff --git a/samples/client/petstore/python-tornado/dev-requirements.txt b/samples/client/petstore/python-tornado/dev-requirements.txt
index f50c13b5c50..ccdfca62949 100644
--- a/samples/client/petstore/python-tornado/dev-requirements.txt
+++ b/samples/client/petstore/python-tornado/dev-requirements.txt
@@ -1,5 +1,2 @@
-nose
 tox
-coverage
-randomize
 flake8
diff --git a/samples/client/petstore/python-tornado/pom.xml b/samples/client/petstore/python-tornado/pom.xml
index 821e12dfe8d..9aae57304fc 100644
--- a/samples/client/petstore/python-tornado/pom.xml
+++ b/samples/client/petstore/python-tornado/pom.xml
@@ -27,7 +27,7 @@
                 <version>1.2.1</version>
                 <executions>
                     <execution>
-                        <id>nose-test</id>
+                        <id>test</id>
                         <phase>integration-test</phase>
                         <goals>
                             <goal>exec</goal>
diff --git a/samples/client/petstore/python-tornado/setup.cfg b/samples/client/petstore/python-tornado/setup.cfg
new file mode 100644
index 00000000000..11433ee875a
--- /dev/null
+++ b/samples/client/petstore/python-tornado/setup.cfg
@@ -0,0 +1,2 @@
+[flake8]
+max-line-length=99
diff --git a/samples/client/petstore/python-tornado/test-requirements.txt b/samples/client/petstore/python-tornado/test-requirements.txt
index 2702246c0e6..4ed3991cbec 100644
--- a/samples/client/petstore/python-tornado/test-requirements.txt
+++ b/samples/client/petstore/python-tornado/test-requirements.txt
@@ -1,5 +1,3 @@
-coverage>=4.0.3
-nose>=1.3.7
-pluggy>=0.3.1
-py>=1.4.31
-randomize>=0.13
+pytest~=4.6.7 # needed for python 2.7+3.4
+pytest-cov>=2.8.1
+pytest-randomly==1.2.3 # needed for python 2.7+3.4
diff --git a/samples/client/petstore/python-tornado/test_python2_and_3.sh b/samples/client/petstore/python-tornado/test_python2_and_3.sh
index 7b5795ec24a..3118c449124 100755
--- a/samples/client/petstore/python-tornado/test_python2_and_3.sh
+++ b/samples/client/petstore/python-tornado/test_python2_and_3.sh
@@ -18,7 +18,6 @@ fi
 
 ### install dependencies
 pip install -r $REQUIREMENTS_FILE | tee -a $REQUIREMENTS_OUT
-python setup.py develop
 
 ### run tests
 tox || exit 1
diff --git a/samples/client/petstore/python-tornado/tox.ini b/samples/client/petstore/python-tornado/tox.ini
index 3d0be613cfc..169d895329b 100644
--- a/samples/client/petstore/python-tornado/tox.ini
+++ b/samples/client/petstore/python-tornado/tox.ini
@@ -6,5 +6,4 @@ deps=-r{toxinidir}/requirements.txt
      -r{toxinidir}/test-requirements.txt
 
 commands=
-   nosetests \
-      []
+   pytest --cov=petstore_api
diff --git a/samples/client/petstore/python/.gitignore b/samples/client/petstore/python/.gitignore
index a655050c263..43995bd42fa 100644
--- a/samples/client/petstore/python/.gitignore
+++ b/samples/client/petstore/python/.gitignore
@@ -45,7 +45,9 @@ coverage.xml
 *,cover
 .hypothesis/
 venv/
+.venv/
 .python-version
+.pytest_cache
 
 # Translations
 *.mo
diff --git a/samples/client/petstore/python/dev-requirements.txt b/samples/client/petstore/python/dev-requirements.txt
index f50c13b5c50..ccdfca62949 100644
--- a/samples/client/petstore/python/dev-requirements.txt
+++ b/samples/client/petstore/python/dev-requirements.txt
@@ -1,5 +1,2 @@
-nose
 tox
-coverage
-randomize
 flake8
diff --git a/samples/client/petstore/python/pom.xml b/samples/client/petstore/python/pom.xml
index db2d09246c3..71814d4388d 100644
--- a/samples/client/petstore/python/pom.xml
+++ b/samples/client/petstore/python/pom.xml
@@ -27,7 +27,7 @@
                 <version>1.2.1</version>
                 <executions>
                     <execution>
-                        <id>nose-test</id>
+                        <id>test</id>
                         <phase>integration-test</phase>
                         <goals>
                             <goal>exec</goal>
diff --git a/samples/client/petstore/python/setup.cfg b/samples/client/petstore/python/setup.cfg
index 26b7a359d58..11433ee875a 100644
--- a/samples/client/petstore/python/setup.cfg
+++ b/samples/client/petstore/python/setup.cfg
@@ -1,11 +1,2 @@
-[nosetests]
-logging-clear-handlers=true
-verbosity=2
-randomize=true
-exe=true
-with-coverage=true
-cover-package=petstore_api
-cover-erase=true
-
 [flake8]
 max-line-length=99
diff --git a/samples/client/petstore/python/test-requirements.txt b/samples/client/petstore/python/test-requirements.txt
index 2702246c0e6..4ed3991cbec 100644
--- a/samples/client/petstore/python/test-requirements.txt
+++ b/samples/client/petstore/python/test-requirements.txt
@@ -1,5 +1,3 @@
-coverage>=4.0.3
-nose>=1.3.7
-pluggy>=0.3.1
-py>=1.4.31
-randomize>=0.13
+pytest~=4.6.7 # needed for python 2.7+3.4
+pytest-cov>=2.8.1
+pytest-randomly==1.2.3 # needed for python 2.7+3.4
diff --git a/samples/client/petstore/python/test_python2.sh b/samples/client/petstore/python/test_python2.sh
index fb0eaed6ffa..4c9488a3329 100755
--- a/samples/client/petstore/python/test_python2.sh
+++ b/samples/client/petstore/python/test_python2.sh
@@ -11,17 +11,16 @@ export LANG=en_US.UTF-8
 
 ### set virtualenv
 if [ -z "$VIRTUAL_ENV" ]; then
-		virtualenv $VENV --no-site-packages --always-copy
+		virtualenv $VENV --no-site-packages --always-copy --python python
 		source $VENV/bin/activate
     DEACTIVE=true
 fi
 
 ### install dependencies
 pip install -r $REQUIREMENTS_FILE | tee -a $REQUIREMENTS_OUT
-python setup.py develop
 
 ### run tests
-nosetests || exit 1
+tox -e py27 || exit 1
 
 ### static analysis of code
 flake8 --show-source petstore_api/
@@ -30,4 +29,3 @@ flake8 --show-source petstore_api/
 #if [ $DEACTIVE == true ]; then
 #    deactivate
 #fi
-
diff --git a/samples/client/petstore/python/test_python2_and_3.sh b/samples/client/petstore/python/test_python2_and_3.sh
index 7b5795ec24a..3118c449124 100755
--- a/samples/client/petstore/python/test_python2_and_3.sh
+++ b/samples/client/petstore/python/test_python2_and_3.sh
@@ -18,7 +18,6 @@ fi
 
 ### install dependencies
 pip install -r $REQUIREMENTS_FILE | tee -a $REQUIREMENTS_OUT
-python setup.py develop
 
 ### run tests
 tox || exit 1
diff --git a/samples/client/petstore/python/tests/test_pet_api.py b/samples/client/petstore/python/tests/test_pet_api.py
index 80d34f6b5f2..b7650f042eb 100644
--- a/samples/client/petstore/python/tests/test_pet_api.py
+++ b/samples/client/petstore/python/tests/test_pet_api.py
@@ -157,7 +157,7 @@ class PetApiTests(unittest.TestCase):
         response = thread.get()
         response2 = thread2.get()
 
-        self.assertEquals(response.id, self.pet.id)
+        self.assertEqual(response.id, self.pet.id)
         self.assertIsNotNone(response2.id, self.pet.id)
 
     def test_async_with_http_info(self):
@@ -167,7 +167,7 @@ class PetApiTests(unittest.TestCase):
         data, status, headers = thread.get()
 
         self.assertIsInstance(data, petstore_api.Pet)
-        self.assertEquals(status, 200)
+        self.assertEqual(status, 200)
 
     def test_async_exception(self):
         self.pet_api.add_pet(self.pet)
diff --git a/samples/client/petstore/python/tox.ini b/samples/client/petstore/python/tox.ini
index 3d0be613cfc..169d895329b 100644
--- a/samples/client/petstore/python/tox.ini
+++ b/samples/client/petstore/python/tox.ini
@@ -6,5 +6,4 @@ deps=-r{toxinidir}/requirements.txt
      -r{toxinidir}/test-requirements.txt
 
 commands=
-   nosetests \
-      []
+   pytest --cov=petstore_api
diff --git a/samples/openapi3/client/petstore/python/.gitignore b/samples/openapi3/client/petstore/python/.gitignore
index a655050c263..43995bd42fa 100644
--- a/samples/openapi3/client/petstore/python/.gitignore
+++ b/samples/openapi3/client/petstore/python/.gitignore
@@ -45,7 +45,9 @@ coverage.xml
 *,cover
 .hypothesis/
 venv/
+.venv/
 .python-version
+.pytest_cache
 
 # Translations
 *.mo
diff --git a/samples/openapi3/client/petstore/python/dev-requirements.txt b/samples/openapi3/client/petstore/python/dev-requirements.txt
new file mode 100644
index 00000000000..ccdfca62949
--- /dev/null
+++ b/samples/openapi3/client/petstore/python/dev-requirements.txt
@@ -0,0 +1,2 @@
+tox
+flake8
diff --git a/samples/openapi3/client/petstore/python/pom.xml b/samples/openapi3/client/petstore/python/pom.xml
index 2fa7d0a113f..98955483eb8 100644
--- a/samples/openapi3/client/petstore/python/pom.xml
+++ b/samples/openapi3/client/petstore/python/pom.xml
@@ -27,7 +27,7 @@
                 <version>1.2.1</version>
                 <executions>
                     <execution>
-                        <id>nose-test</id>
+                        <id>test</id>
                         <phase>integration-test</phase>
                         <goals>
                             <goal>exec</goal>
diff --git a/samples/openapi3/client/petstore/python/setup.cfg b/samples/openapi3/client/petstore/python/setup.cfg
new file mode 100644
index 00000000000..11433ee875a
--- /dev/null
+++ b/samples/openapi3/client/petstore/python/setup.cfg
@@ -0,0 +1,2 @@
+[flake8]
+max-line-length=99
diff --git a/samples/openapi3/client/petstore/python/test-requirements.txt b/samples/openapi3/client/petstore/python/test-requirements.txt
index 2702246c0e6..4ed3991cbec 100644
--- a/samples/openapi3/client/petstore/python/test-requirements.txt
+++ b/samples/openapi3/client/petstore/python/test-requirements.txt
@@ -1,5 +1,3 @@
-coverage>=4.0.3
-nose>=1.3.7
-pluggy>=0.3.1
-py>=1.4.31
-randomize>=0.13
+pytest~=4.6.7 # needed for python 2.7+3.4
+pytest-cov>=2.8.1
+pytest-randomly==1.2.3 # needed for python 2.7+3.4
diff --git a/samples/openapi3/client/petstore/python/test_python2.sh b/samples/openapi3/client/petstore/python/test_python2.sh
index fb0eaed6ffa..24c3cbdd496 100644
--- a/samples/openapi3/client/petstore/python/test_python2.sh
+++ b/samples/openapi3/client/petstore/python/test_python2.sh
@@ -18,10 +18,9 @@ fi
 
 ### install dependencies
 pip install -r $REQUIREMENTS_FILE | tee -a $REQUIREMENTS_OUT
-python setup.py develop
 
 ### run tests
-nosetests || exit 1
+tox -e py27 || exit 1
 
 ### static analysis of code
 flake8 --show-source petstore_api/
diff --git a/samples/openapi3/client/petstore/python/test_python2_and_3.sh b/samples/openapi3/client/petstore/python/test_python2_and_3.sh
index daf08d5bacb..ab02e6e4080 100644
--- a/samples/openapi3/client/petstore/python/test_python2_and_3.sh
+++ b/samples/openapi3/client/petstore/python/test_python2_and_3.sh
@@ -18,7 +18,6 @@ fi
 
 ### install dependencies
 pip install -r $REQUIREMENTS_FILE | tee -a $REQUIREMENTS_OUT
-python setup.py develop
 
 ### run tests
 tox || exit 1
diff --git a/samples/openapi3/client/petstore/python/tox.ini b/samples/openapi3/client/petstore/python/tox.ini
index 3d0be613cfc..169d895329b 100644
--- a/samples/openapi3/client/petstore/python/tox.ini
+++ b/samples/openapi3/client/petstore/python/tox.ini
@@ -6,5 +6,4 @@ deps=-r{toxinidir}/requirements.txt
      -r{toxinidir}/test-requirements.txt
 
 commands=
-   nosetests \
-      []
+   pytest --cov=petstore_api
diff --git a/samples/openapi3/server/petstore/python-flask-python2/.gitignore b/samples/openapi3/server/petstore/python-flask-python2/.gitignore
index a655050c263..43995bd42fa 100644
--- a/samples/openapi3/server/petstore/python-flask-python2/.gitignore
+++ b/samples/openapi3/server/petstore/python-flask-python2/.gitignore
@@ -45,7 +45,9 @@ coverage.xml
 *,cover
 .hypothesis/
 venv/
+.venv/
 .python-version
+.pytest_cache
 
 # Translations
 *.mo
diff --git a/samples/openapi3/server/petstore/python-flask-python2/requirements.txt b/samples/openapi3/server/petstore/python-flask-python2/requirements.txt
index bc535706622..5c5ce2a1a26 100644
--- a/samples/openapi3/server/petstore/python-flask-python2/requirements.txt
+++ b/samples/openapi3/server/petstore/python-flask-python2/requirements.txt
@@ -1,4 +1,7 @@
-connexion >= 2.0.2
+connexion >= 2.5.0; python_version>="3.6"
+connexion >= 2.3.0; python_version=="3.5"
+connexion >= 2.3.0; python_version=="3.4"
+connexion == 2.4.0; python_version<="2.7"
 swagger-ui-bundle >= 0.0.2
 python_dateutil >= 2.6.0
 typing >= 3.5.2.2
diff --git a/samples/openapi3/server/petstore/python-flask-python2/test-requirements.txt b/samples/openapi3/server/petstore/python-flask-python2/test-requirements.txt
index 7f8d96e6b40..a2626d875ff 100644
--- a/samples/openapi3/server/petstore/python-flask-python2/test-requirements.txt
+++ b/samples/openapi3/server/petstore/python-flask-python2/test-requirements.txt
@@ -1,6 +1,4 @@
-flask_testing==0.6.1
-coverage>=4.0.3
-nose>=1.3.7
-pluggy>=0.3.1
-py>=1.4.31
-randomize>=0.13
+pytest~=4.6.7 # needed for python 2.7+3.4
+pytest-cov>=2.8.1
+pytest-randomly==1.2.3 # needed for python 2.7+3.4
+flask_testing==0.6.1
\ No newline at end of file
diff --git a/samples/openapi3/server/petstore/python-flask-python2/tox.ini b/samples/openapi3/server/petstore/python-flask-python2/tox.ini
index 26985414c88..d05c607610c 100644
--- a/samples/openapi3/server/petstore/python-flask-python2/tox.ini
+++ b/samples/openapi3/server/petstore/python-flask-python2/tox.ini
@@ -6,5 +6,4 @@ deps=-r{toxinidir}/requirements.txt
      -r{toxinidir}/test-requirements.txt
 
 commands=
-   nosetests \
-      []
\ No newline at end of file
+   pytest --cov=openapi_server
\ No newline at end of file
diff --git a/samples/openapi3/server/petstore/python-flask/.gitignore b/samples/openapi3/server/petstore/python-flask/.gitignore
index a655050c263..43995bd42fa 100644
--- a/samples/openapi3/server/petstore/python-flask/.gitignore
+++ b/samples/openapi3/server/petstore/python-flask/.gitignore
@@ -45,7 +45,9 @@ coverage.xml
 *,cover
 .hypothesis/
 venv/
+.venv/
 .python-version
+.pytest_cache
 
 # Translations
 *.mo
diff --git a/samples/openapi3/server/petstore/python-flask/requirements.txt b/samples/openapi3/server/petstore/python-flask/requirements.txt
index 1a01b580490..029a9dae4cd 100644
--- a/samples/openapi3/server/petstore/python-flask/requirements.txt
+++ b/samples/openapi3/server/petstore/python-flask/requirements.txt
@@ -1,4 +1,7 @@
-connexion >= 2.0.2
+connexion >= 2.5.0; python_version>="3.6"
+connexion >= 2.3.0; python_version=="3.5"
+connexion >= 2.3.0; python_version=="3.4"
+connexion == 2.4.0; python_version<="2.7"
 swagger-ui-bundle >= 0.0.2
 python_dateutil >= 2.6.0
 setuptools >= 21.0.0
diff --git a/samples/openapi3/server/petstore/python-flask/test-requirements.txt b/samples/openapi3/server/petstore/python-flask/test-requirements.txt
index 7f8d96e6b40..a2626d875ff 100644
--- a/samples/openapi3/server/petstore/python-flask/test-requirements.txt
+++ b/samples/openapi3/server/petstore/python-flask/test-requirements.txt
@@ -1,6 +1,4 @@
-flask_testing==0.6.1
-coverage>=4.0.3
-nose>=1.3.7
-pluggy>=0.3.1
-py>=1.4.31
-randomize>=0.13
+pytest~=4.6.7 # needed for python 2.7+3.4
+pytest-cov>=2.8.1
+pytest-randomly==1.2.3 # needed for python 2.7+3.4
+flask_testing==0.6.1
\ No newline at end of file
diff --git a/samples/openapi3/server/petstore/python-flask/tox.ini b/samples/openapi3/server/petstore/python-flask/tox.ini
index ab4dfbb81b8..cff71191e6c 100644
--- a/samples/openapi3/server/petstore/python-flask/tox.ini
+++ b/samples/openapi3/server/petstore/python-flask/tox.ini
@@ -6,5 +6,4 @@ deps=-r{toxinidir}/requirements.txt
      -r{toxinidir}/test-requirements.txt
 
 commands=
-   nosetests \
-      []
\ No newline at end of file
+   pytest --cov=openapi_server
\ No newline at end of file
diff --git a/samples/server/petstore/python-aiohttp/.gitignore b/samples/server/petstore/python-aiohttp/.gitignore
new file mode 100644
index 00000000000..43995bd42fa
--- /dev/null
+++ b/samples/server/petstore/python-aiohttp/.gitignore
@@ -0,0 +1,66 @@
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+env/
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+*.egg-info/
+.installed.cfg
+*.egg
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*,cover
+.hypothesis/
+venv/
+.venv/
+.python-version
+.pytest_cache
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+target/
+
+#Ipython Notebook
+.ipynb_checkpoints
diff --git a/samples/server/petstore/python-aiohttp/dev-requirements.txt b/samples/server/petstore/python-aiohttp/dev-requirements.txt
new file mode 100644
index 00000000000..ccdfca62949
--- /dev/null
+++ b/samples/server/petstore/python-aiohttp/dev-requirements.txt
@@ -0,0 +1,2 @@
+tox
+flake8
diff --git a/samples/server/petstore/python-aiohttp/pom.xml b/samples/server/petstore/python-aiohttp/pom.xml
index 8e77233a458..26c4b7c492d 100644
--- a/samples/server/petstore/python-aiohttp/pom.xml
+++ b/samples/server/petstore/python-aiohttp/pom.xml
@@ -27,7 +27,7 @@
                 <version>1.2.1</version>
                 <executions>
                     <execution>
-                        <id>pytest-test</id>
+                        <id>test</id>
                         <phase>integration-test</phase>
                         <goals>
                             <goal>exec</goal>
diff --git a/samples/server/petstore/python-aiohttp/test-requirements.txt b/samples/server/petstore/python-aiohttp/test-requirements.txt
index 1cb425f6551..31b28baaf28 100644
--- a/samples/server/petstore/python-aiohttp/test-requirements.txt
+++ b/samples/server/petstore/python-aiohttp/test-requirements.txt
@@ -1,6 +1,4 @@
-coverage>=4.0.3
-pytest>=1.3.7
-pluggy>=0.3.1
-py>=1.4.31
-randomize>=0.13
+pytest~=4.6.7 # needed for python 2.7+3.4
+pytest-cov>=2.8.1
+pytest-randomly==1.2.3 # needed for python 2.7+3.4
 pytest-aiohttp>=0.3.0
diff --git a/samples/server/petstore/python-aiohttp/test_python3.sh b/samples/server/petstore/python-aiohttp/test_python3.sh
index c6a92d00aed..65d96267d4f 100755
--- a/samples/server/petstore/python-aiohttp/test_python3.sh
+++ b/samples/server/petstore/python-aiohttp/test_python3.sh
@@ -1,8 +1,7 @@
 #!/bin/bash
 
-REQUIREMENTS_FILE=requirements.txt
-TEST_REQUIREMENTS_FILE=test-requirements.txt
-REQUIREMENTS_OUT=requirements.txt.log
+REQUIREMENTS_FILE=dev-requirements.txt
+REQUIREMENTS_OUT=dev-requirements.txt.log
 SETUP_OUT=*.egg-info
 VENV=.venv
 DEACTIVE=false
@@ -12,16 +11,16 @@ export LANG=en_US.UTF-8
 
 ### set virtualenv
 if [ -z "$VIRTUAL_ENV" ]; then
-	virtualenv $VENV --no-site-packages --always-copy --python python3
+		virtualenv $VENV --no-site-packages --always-copy --python python3
 		source $VENV/bin/activate
     DEACTIVE=true
 fi
 
 ### install dependencies
-pip install -r $REQUIREMENTS_FILE -r $TEST_REQUIREMENTS_FILE | tee -a $REQUIREMENTS_OUT
+pip install -r $REQUIREMENTS_FILE | tee -a $REQUIREMENTS_OUT
 
 ### run tests
-pytest || exit 1
+tox || exit 1
 
 ### static analysis of code
 flake8 --show-source petstore_api/
diff --git a/samples/server/petstore/python-aiohttp/tox.ini b/samples/server/petstore/python-aiohttp/tox.ini
new file mode 100644
index 00000000000..0f7cd42b8a8
--- /dev/null
+++ b/samples/server/petstore/python-aiohttp/tox.ini
@@ -0,0 +1,10 @@
+[tox]
+envlist = py3
+skipsdist=True
+
+[testenv]
+deps=-r{toxinidir}/requirements.txt
+     -r{toxinidir}/test-requirements.txt
+
+commands=
+   pytest --cov=openapi_server
\ No newline at end of file
diff --git a/samples/server/petstore/python-blueplanet/.openapi-generator/VERSION b/samples/server/petstore/python-blueplanet/.openapi-generator/VERSION
index 0c89fc927e3..58592f031f6 100644
--- a/samples/server/petstore/python-blueplanet/.openapi-generator/VERSION
+++ b/samples/server/petstore/python-blueplanet/.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-blueplanet/app/.gitignore b/samples/server/petstore/python-blueplanet/app/.gitignore
index a655050c263..a77a0ebd166 100644
--- a/samples/server/petstore/python-blueplanet/app/.gitignore
+++ b/samples/server/petstore/python-blueplanet/app/.gitignore
@@ -46,6 +46,7 @@ coverage.xml
 .hypothesis/
 venv/
 .python-version
+.pytest_cache
 
 # Translations
 *.mo
diff --git a/samples/server/petstore/python-blueplanet/app/test-requirements.txt b/samples/server/petstore/python-blueplanet/app/test-requirements.txt
index 7f8d96e6b40..a2626d875ff 100644
--- a/samples/server/petstore/python-blueplanet/app/test-requirements.txt
+++ b/samples/server/petstore/python-blueplanet/app/test-requirements.txt
@@ -1,6 +1,4 @@
-flask_testing==0.6.1
-coverage>=4.0.3
-nose>=1.3.7
-pluggy>=0.3.1
-py>=1.4.31
-randomize>=0.13
+pytest~=4.6.7 # needed for python 2.7+3.4
+pytest-cov>=2.8.1
+pytest-randomly==1.2.3 # needed for python 2.7+3.4
+flask_testing==0.6.1
\ No newline at end of file
diff --git a/samples/server/petstore/python-blueplanet/app/tox.ini b/samples/server/petstore/python-blueplanet/app/tox.ini
index 3e0b644eec4..d2eb61d57c7 100644
--- a/samples/server/petstore/python-blueplanet/app/tox.ini
+++ b/samples/server/petstore/python-blueplanet/app/tox.ini
@@ -6,5 +6,4 @@ deps=-r{toxinidir}/requirements.txt
      -r{toxinidir}/test-requirements.txt
 
 commands=
-   nosetests \
-      []
\ No newline at end of file
+   pytest --cov=openapi_server
\ No newline at end of file
diff --git a/samples/server/petstore/python-flask-python2/.gitignore b/samples/server/petstore/python-flask-python2/.gitignore
index a655050c263..43995bd42fa 100644
--- a/samples/server/petstore/python-flask-python2/.gitignore
+++ b/samples/server/petstore/python-flask-python2/.gitignore
@@ -45,7 +45,9 @@ coverage.xml
 *,cover
 .hypothesis/
 venv/
+.venv/
 .python-version
+.pytest_cache
 
 # Translations
 *.mo
diff --git a/samples/server/petstore/python-flask-python2/dev-requirements.txt b/samples/server/petstore/python-flask-python2/dev-requirements.txt
new file mode 100644
index 00000000000..ccdfca62949
--- /dev/null
+++ b/samples/server/petstore/python-flask-python2/dev-requirements.txt
@@ -0,0 +1,2 @@
+tox
+flake8
diff --git a/samples/server/petstore/python-flask-python2/pom.xml b/samples/server/petstore/python-flask-python2/pom.xml
index 113c387d5f2..430bddf2ed3 100644
--- a/samples/server/petstore/python-flask-python2/pom.xml
+++ b/samples/server/petstore/python-flask-python2/pom.xml
@@ -27,7 +27,7 @@
                 <version>1.2.1</version>
                 <executions>
                     <execution>
-                        <id>nose-test</id>
+                        <id>test</id>
                         <phase>integration-test</phase>
                         <goals>
                             <goal>exec</goal>
diff --git a/samples/server/petstore/python-flask-python2/requirements.txt b/samples/server/petstore/python-flask-python2/requirements.txt
index bc535706622..5c5ce2a1a26 100644
--- a/samples/server/petstore/python-flask-python2/requirements.txt
+++ b/samples/server/petstore/python-flask-python2/requirements.txt
@@ -1,4 +1,7 @@
-connexion >= 2.0.2
+connexion >= 2.5.0; python_version>="3.6"
+connexion >= 2.3.0; python_version=="3.5"
+connexion >= 2.3.0; python_version=="3.4"
+connexion == 2.4.0; python_version<="2.7"
 swagger-ui-bundle >= 0.0.2
 python_dateutil >= 2.6.0
 typing >= 3.5.2.2
diff --git a/samples/server/petstore/python-flask-python2/test-requirements.txt b/samples/server/petstore/python-flask-python2/test-requirements.txt
index 7f8d96e6b40..a2626d875ff 100644
--- a/samples/server/petstore/python-flask-python2/test-requirements.txt
+++ b/samples/server/petstore/python-flask-python2/test-requirements.txt
@@ -1,6 +1,4 @@
-flask_testing==0.6.1
-coverage>=4.0.3
-nose>=1.3.7
-pluggy>=0.3.1
-py>=1.4.31
-randomize>=0.13
+pytest~=4.6.7 # needed for python 2.7+3.4
+pytest-cov>=2.8.1
+pytest-randomly==1.2.3 # needed for python 2.7+3.4
+flask_testing==0.6.1
\ No newline at end of file
diff --git a/samples/server/petstore/python-flask-python2/test_python2.sh b/samples/server/petstore/python-flask-python2/test_python2.sh
index e579f4d7f55..89e56c485de 100755
--- a/samples/server/petstore/python-flask-python2/test_python2.sh
+++ b/samples/server/petstore/python-flask-python2/test_python2.sh
@@ -1,7 +1,7 @@
 #!/bin/bash
 
-REQUIREMENTS_FILE=test-requirements.txt
-REQUIREMENTS_OUT=test-requirements.txt.log
+REQUIREMENTS_FILE=dev-requirements.txt
+REQUIREMENTS_OUT=dev-requirements.txt.log
 SETUP_OUT=*.egg-info
 VENV=.venv
 DEACTIVE=false
@@ -18,15 +18,14 @@ fi
 
 ### install dependencies
 pip install -r $REQUIREMENTS_FILE | tee -a $REQUIREMENTS_OUT
-python setup.py develop
 
 ### run tests
-tox || exit 1
+tox -e py27 || exit 1
 
 ### static analysis of code
 flake8 --show-source petstore_api/
 
 ### deactivate virtualenv
-#if [ $DEACTIVE == true ]; then
-#    deactivate
-#fi
+# if [ $DEACTIVE == true ]; then
+#     deactivate
+# fi
diff --git a/samples/server/petstore/python-flask-python2/tox.ini b/samples/server/petstore/python-flask-python2/tox.ini
index 26985414c88..d05c607610c 100644
--- a/samples/server/petstore/python-flask-python2/tox.ini
+++ b/samples/server/petstore/python-flask-python2/tox.ini
@@ -6,5 +6,4 @@ deps=-r{toxinidir}/requirements.txt
      -r{toxinidir}/test-requirements.txt
 
 commands=
-   nosetests \
-      []
\ No newline at end of file
+   pytest --cov=openapi_server
\ No newline at end of file
diff --git a/samples/server/petstore/python-flask/.gitignore b/samples/server/petstore/python-flask/.gitignore
index a655050c263..43995bd42fa 100644
--- a/samples/server/petstore/python-flask/.gitignore
+++ b/samples/server/petstore/python-flask/.gitignore
@@ -45,7 +45,9 @@ coverage.xml
 *,cover
 .hypothesis/
 venv/
+.venv/
 .python-version
+.pytest_cache
 
 # Translations
 *.mo
diff --git a/samples/server/petstore/python-flask/dev-requirements.txt b/samples/server/petstore/python-flask/dev-requirements.txt
new file mode 100644
index 00000000000..ccdfca62949
--- /dev/null
+++ b/samples/server/petstore/python-flask/dev-requirements.txt
@@ -0,0 +1,2 @@
+tox
+flake8
diff --git a/samples/server/petstore/python-flask/pom.xml b/samples/server/petstore/python-flask/pom.xml
index 2834d92dbc7..542458a0e48 100644
--- a/samples/server/petstore/python-flask/pom.xml
+++ b/samples/server/petstore/python-flask/pom.xml
@@ -27,7 +27,7 @@
                 <version>1.2.1</version>
                 <executions>
                     <execution>
-                        <id>nose-test</id>
+                        <id>test</id>
                         <phase>integration-test</phase>
                         <goals>
                             <goal>exec</goal>
diff --git a/samples/server/petstore/python-flask/requirements.txt b/samples/server/petstore/python-flask/requirements.txt
index 1a01b580490..029a9dae4cd 100644
--- a/samples/server/petstore/python-flask/requirements.txt
+++ b/samples/server/petstore/python-flask/requirements.txt
@@ -1,4 +1,7 @@
-connexion >= 2.0.2
+connexion >= 2.5.0; python_version>="3.6"
+connexion >= 2.3.0; python_version=="3.5"
+connexion >= 2.3.0; python_version=="3.4"
+connexion == 2.4.0; python_version<="2.7"
 swagger-ui-bundle >= 0.0.2
 python_dateutil >= 2.6.0
 setuptools >= 21.0.0
diff --git a/samples/server/petstore/python-flask/test-requirements.txt b/samples/server/petstore/python-flask/test-requirements.txt
index 7f8d96e6b40..a2626d875ff 100644
--- a/samples/server/petstore/python-flask/test-requirements.txt
+++ b/samples/server/petstore/python-flask/test-requirements.txt
@@ -1,6 +1,4 @@
-flask_testing==0.6.1
-coverage>=4.0.3
-nose>=1.3.7
-pluggy>=0.3.1
-py>=1.4.31
-randomize>=0.13
+pytest~=4.6.7 # needed for python 2.7+3.4
+pytest-cov>=2.8.1
+pytest-randomly==1.2.3 # needed for python 2.7+3.4
+flask_testing==0.6.1
\ No newline at end of file
diff --git a/samples/server/petstore/python-flask/test_python3.sh b/samples/server/petstore/python-flask/test_python3.sh
index 9bd589401cd..32fb184fdd8 100755
--- a/samples/server/petstore/python-flask/test_python3.sh
+++ b/samples/server/petstore/python-flask/test_python3.sh
@@ -1,7 +1,7 @@
 #!/bin/bash
 
-REQUIREMENTS_FILE=test-requirements.txt
-REQUIREMENTS_OUT=test-requirements.txt.log
+REQUIREMENTS_FILE=dev-requirements.txt
+REQUIREMENTS_OUT=dev-requirements.txt.log
 SETUP_OUT=*.egg-info
 VENV=.venv
 DEACTIVE=false
@@ -18,7 +18,6 @@ fi
 
 ### install dependencies
 pip install -r $REQUIREMENTS_FILE | tee -a $REQUIREMENTS_OUT
-python setup.py develop
 
 ### run tests
 tox || exit 1
@@ -27,6 +26,6 @@ tox || exit 1
 flake8 --show-source petstore_api/
 
 ### deactivate virtualenv
-#if [ $DEACTIVE == true ]; then
-#    deactivate
-#fi
+# if [ $DEACTIVE == true ]; then
+#     deactivate
+# fi
diff --git a/samples/server/petstore/python-flask/tox.ini b/samples/server/petstore/python-flask/tox.ini
index ab4dfbb81b8..cff71191e6c 100644
--- a/samples/server/petstore/python-flask/tox.ini
+++ b/samples/server/petstore/python-flask/tox.ini
@@ -6,5 +6,4 @@ deps=-r{toxinidir}/requirements.txt
      -r{toxinidir}/test-requirements.txt
 
 commands=
-   nosetests \
-      []
\ No newline at end of file
+   pytest --cov=openapi_server
\ No newline at end of file