diff --git a/tests/test_tracing.py b/tests/test_tracing.py
index 5cc855d7..25cdd2d9 100644
--- a/tests/test_tracing.py
+++ b/tests/test_tracing.py
@@ -14,6 +14,12 @@
 
 
 import pytest
+from opentelemetry import trace as trace_api
+from opentelemetry.exporter.otlp.proto.grpc.trace_exporter import (
+    OTLPSpanExporter,
+)
+from opentelemetry.sdk import trace as trace_sdk
+from opentelemetry.sdk.trace.export import BatchSpanProcessor
 
 from veadk.tracing.telemetry.exporters.apmplus_exporter import (
     APMPlusExporter,
@@ -29,17 +35,11 @@
 )
 from veadk.tracing.telemetry.opentelemetry_tracer import OpentelemetryTracer
 
-from opentelemetry import trace as trace_api
-from opentelemetry.sdk import trace as trace_sdk
-from opentelemetry.sdk.trace.export import BatchSpanProcessor
-from opentelemetry.exporter.otlp.proto.grpc.trace_exporter import (
-        OTLPSpanExporter,
-    )
-
 APP_NAME = "app"
 USER_ID = "testuser"
 SESSION_ID = "testsession"
 
+
 def init_exporters():
     cozeloop_exporter = CozeloopExporter(
         config=CozeloopExporterConfig(
@@ -68,6 +68,7 @@ def init_exporters():
     )
     return [cozeloop_exporter, apmplus_exporter, tls_exporter]
 
+
 def gen_span_processor(endpoint: str):
     otlp_exporter = OTLPSpanExporter(
         endpoint=endpoint,
@@ -75,6 +76,7 @@ def gen_span_processor(endpoint: str):
     span_processor = BatchSpanProcessor(otlp_exporter)
     return span_processor
 
+
 @pytest.mark.asyncio
 async def test_tracing():
     exporters = init_exporters()
@@ -86,6 +88,7 @@ async def test_tracing():
     # TODO: Ensure the tracing provider is set correctly after loading SDK
     # TODO: Ensure the tracing provider is set correctly after loading SDK
 
+
 @pytest.mark.asyncio
 async def test_tracing_with_global_provider():
     exporters = init_exporters()
@@ -113,5 +116,3 @@ async def test_tracing_with_apmplus_global_provider():
 
     # apmplus exporter won't init again
     assert len(tracer.exporters) == 4  # with extra 2 built-in exporters
-
-
diff --git a/veadk/tracing/telemetry/opentelemetry_tracer.py b/veadk/tracing/telemetry/opentelemetry_tracer.py
index f3a0e1e7..d579a0d4 100644
--- a/veadk/tracing/telemetry/opentelemetry_tracer.py
+++ b/veadk/tracing/telemetry/opentelemetry_tracer.py
@@ -19,12 +19,11 @@
 from typing import Any
 
 from openinference.instrumentation.google_adk import GoogleADKInstrumentor
-from opentelemetry.sdk import trace as trace_sdk
 from opentelemetry import trace as trace_api
+from opentelemetry.sdk import trace as trace_sdk
 from opentelemetry.sdk.resources import Resource
 from opentelemetry.sdk.trace import TracerProvider
 from opentelemetry.sdk.trace.export import BatchSpanProcessor, SimpleSpanProcessor
-
 from pydantic import BaseModel, ConfigDict, Field
 from typing_extensions import override
 
@@ -112,7 +111,7 @@ def _init_tracer_provider(self):
 
         if not isinstance(global_tracer_provider, TracerProvider):
             logger.info(
-                f"Global tracer provider has not been set. Create tracer provider and set it now."
+                "Global tracer provider has not been set. Create tracer provider and set it now."
             )
             # 1.1 init tracer provider
             tracer_provider = trace_sdk.TracerProvider()
@@ -144,7 +143,6 @@ def _init_tracer_provider(self):
             self._processors.append(processor)
         logger.debug(f"Init OpentelemetryTracer with {len(self.exporters)} exporters.")
 
-
     @override
     def dump(
         self,