diff --git a/python/basics/app/0_durable_execution.py b/python/basics/app/0_durable_execution.py
index a8340654..398c543e 100644
--- a/python/basics/app/0_durable_execution.py
+++ b/python/basics/app/0_durable_execution.py
@@ -49,7 +49,7 @@ async def add(ctx: Context, req: SubscriptionRequest):
         create_recurring_payment,
         credit_card=req.credit_card,
         payment_id=payment_id
-    ),
+    )
 
     for subscription in req.subscriptions:
         await ctx.run_typed(
@@ -61,8 +61,7 @@ async def add(ctx: Context, req: SubscriptionRequest):
         )
 
 
-# Create an HTTP endpoint to serve your services on port 9080
-# or use .handler() to run on Lambda, Deno, Bun, Cloudflare Workers, ...
+# Define 'app' used by hypercorn (or other HTTP servers) to serve the SDK
 app = restate.app([subscription_service])
 
 """
diff --git a/python/basics/app/1_building_blocks.py b/python/basics/app/1_building_blocks.py
index 4384b5e5..59e13856 100644
--- a/python/basics/app/1_building_blocks.py
+++ b/python/basics/app/1_building_blocks.py
@@ -1,4 +1,3 @@
-import uuid
 from datetime import timedelta
 
 import restate
@@ -70,7 +69,12 @@ async def run(ctx: restate.Context):
     # Then use these to call other APIs and let them deduplicate
     payment_deduplication_id = str(ctx.uuid())
 
-    result = await ctx.run_typed("charge",
-                                 charge_bank_account,
-                                 payment_deduplication_id=payment_deduplication_id,
-                                 amount=100)
+    result = await ctx.run_typed(
+        "charge",
+        charge_bank_account,
+        payment_deduplication_id=payment_deduplication_id,
+        amount=100)
+
+
+# Define 'app' used by hypercorn (or other HTTP servers) to serve the SDK
+app = restate.app([my_service, subscription_service])
diff --git a/python/basics/app/2_virtual_objects.py b/python/basics/app/2_virtual_objects.py
index 06fa3389..5afd17a5 100644
--- a/python/basics/app/2_virtual_objects.py
+++ b/python/basics/app/2_virtual_objects.py
@@ -37,6 +37,7 @@ async def ungreet(ctx: ObjectContext) -> str:
     return f"Goodbye {ctx.key()}, taking one greeting back: {count}."
 
 
+# Define 'app' used by hypercorn (or other HTTP servers) to serve the SDK
 app = restate.app(services=[greeter_object])
 
 """
diff --git a/python/basics/app/3_workflows.py b/python/basics/app/3_workflows.py
index 9ac98b7c..22ba2327 100644
--- a/python/basics/app/3_workflows.py
+++ b/python/basics/app/3_workflows.py
@@ -49,6 +49,7 @@ async def click(ctx: WorkflowSharedContext, secret: str):
     await ctx.promise("link_clicked").resolve(secret)
 
 
+# Define 'app' used by hypercorn (or other HTTP servers) to serve the SDK
 app = restate.app(services=[user_signup])
 
 """
diff --git a/python/basics/app/utils.py b/python/basics/app/utils.py
index c5f986d7..830c2144 100644
--- a/python/basics/app/utils.py
+++ b/python/basics/app/utils.py
@@ -25,7 +25,7 @@ def create_subscription(user_id: str, subscription: str, payment_ref: str) -> st
 
 
 # Simulates calling a payment API, with a random probability of API downtime.
-def create_recurring_payment(_credit_card: str, payment_id: str) -> str:
+def create_recurring_payment(credit_card: str, payment_id: str) -> str:
     maybe_crash(0.3)
     print(f">>> Creating recurring payment {payment_id}")
     return "payment-reference"