diff --git a/sdks/python/examples/demo_data_generator.py b/sdks/python/examples/demo_data_generator.py
index 3dc91f8ab4..8b411e02c5 100644
--- a/sdks/python/examples/demo_data_generator.py
+++ b/sdks/python/examples/demo_data_generator.py
@@ -11,10 +11,11 @@
 
 UUID_MAP = {}
 
+
 def get_new_uuid(old_id):
     """
     The demo_data has the IDs hardcoded in, to preserve the relationships between the traces and spans.
-    However, we need to generate unique ones before logging them. 
+    However, we need to generate unique ones before logging them.
     """
     if old_id in UUID_MAP:
         new_id = UUID_MAP[old_id]
@@ -23,9 +24,15 @@ def get_new_uuid(old_id):
         UUID_MAP[old_id] = new_id
     return new_id
 
+
 def create_demo_data(base_url: str, workspace_name, comet_api_key):
-    
-    client = opik.Opik(project_name="Demo evaluation", workspace=workspace_name, host=base_url, api_key=comet_api_key)
+
+    client = opik.Opik(
+        project_name="Demo evaluation",
+        workspace=workspace_name,
+        host=base_url,
+        api_key=comet_api_key,
+    )
 
     for trace in sorted(evaluation_traces, key=lambda x: x["start_time"]):
         new_id = get_new_uuid(trace["id"])
@@ -46,7 +53,12 @@ def create_demo_data(base_url: str, workspace_name, comet_api_key):
     # We have a simple chatbot application built using llama-index.
     # We gave it the content of Opik documentation as context, and then asked it a few questions.
 
-    client = opik.Opik(project_name="Demo chatbot 🤖", workspace=workspace_name, host=base_url, api_key=comet_api_key)
+    client = opik.Opik(
+        project_name="Demo chatbot 🤖",
+        workspace=workspace_name,
+        host=base_url,
+        api_key=comet_api_key,
+    )
 
     for trace in sorted(demo_traces, key=lambda x: x["start_time"]):
         new_id = get_new_uuid(trace["id"])