diff --git a/examples/miniapps/commands-and-handlers/application/__main__.py b/examples/miniapps/commands-and-handlers/application/__main__.py
index ee7c6de3..672475f8 100644
--- a/examples/miniapps/commands-and-handlers/application/__main__.py
+++ b/examples/miniapps/commands-and-handlers/application/__main__.py
@@ -4,7 +4,7 @@ from .containers import Container
 from .commands import SaveRating, DoSomethingElse
 
 
-if __name__ == '__main__':
+if __name__ == "__main__":
     container = Container()
     message_bus = container.message_bus()
 
diff --git a/examples/miniapps/commands-and-handlers/application/handler.py b/examples/miniapps/commands-and-handlers/application/handler.py
index 0d940801..1c26578c 100644
--- a/examples/miniapps/commands-and-handlers/application/handler.py
+++ b/examples/miniapps/commands-and-handlers/application/handler.py
@@ -8,7 +8,7 @@ class CommandHandler:
         self.rating_repo = rating_repo
 
     def save_rating(self):
-        print('Saving rating')
+        print("Saving rating")
 
     def something_else(self):
-        print('Doing something else')
+        print("Doing something else")