diff --git a/grpc/python_client/async_client.py b/grpc/python_client/async_client.py
index 9561ac8297..55cdbc645f 100755
--- a/grpc/python_client/async_client.py
+++ b/grpc/python_client/async_client.py
@@ -1,24 +1,28 @@
 #!/usr/bin/env python
 
+
 from __future__ import print_function
 import grpc
 import time
+import threading
 import dronecore_pb2 as dc
-#import dronecore_pb2_grpc
-# import dronecore_pb2_grpc
-import action_pb2 as dc_action
-import action_pb2_grpc
+import dronecore_pb2_grpc
+# import action_pb2 as dc_action
+# import action_pb2_grpc
 import telemetry_pb2 as dc_telemetry
 import telemetry_pb2_grpc
 
+
 class Colors:
     BLUE = "\033[34m"
     RESET = "\033[0m"
 
+
 def wait_until(status):
     ret = status.result()
     return ret
 
+
 def print_altitude(telemetry_stub, stop):
     for i, position in enumerate(
         telemetry_stub.TelemetryPositionSubscription(
@@ -32,10 +36,11 @@ def print_altitude(telemetry_stub, stop):
         if stop.is_set():
             break
 
+
 def run():
     channel = grpc.insecure_channel('0.0.0.0:50051')
-#    stub = dronecore_pb2_grpc.DroneCoreRPCStub(channel)
-    action_stub = action_pb2_grpc.ActionRPCStub(channel)
+    stub = dronecore_pb2_grpc.DroneCoreRPCStub(channel)
+    # action_stub = action_pb2_grpc.ActionRPCStub(channel)
     telemetry_stub = telemetry_pb2_grpc.TelemetryRPCStub(channel)
 
     # We use this stop event later to stop the thread.
@@ -69,5 +74,6 @@ def run():
         print("landing failed: " + land_result.result_str)
     time.sleep(3)
 
+
 if __name__ == '__main__':
     run()
diff --git a/grpc/python_client/fly_mission.py b/grpc/python_client/fly_mission.py
index 5dc5d5a22f..192ebeec6d 100755
--- a/grpc/python_client/fly_mission.py
+++ b/grpc/python_client/fly_mission.py
@@ -6,9 +6,9 @@
 from threading import Thread
 import time
 import dronecore_pb2 as dc
-#import dronecore_pb2_grpc
 # import dronecore_pb2_grpc
-import action_pb2 as dc_action
+# import dronecore_pb2_grpc
+# import action_pb2 as dc_action
 import action_pb2_grpc
 import mission_pb2 as dc_mission
 import mission_pb2_grpc
@@ -27,7 +27,7 @@ def wait_func(future_status):
 def run():
     global thread_status
     channel = grpc.insecure_channel('0.0.0.0:50051')
-#    stub = dronecore_pb2_grpc.DroneCoreRPCStub(channel)
+    # stub = dronecore_pb2_grpc.DroneCoreRPCStub(channel)
     action_stub = action_pb2_grpc.ActionRPCStub(channel)
     mission_stub = mission_pb2_grpc.MissionRPCStub(channel)
 
diff --git a/grpc/python_client/sync_client.py b/grpc/python_client/sync_client.py
index d85c12243f..8442d3e23a 100755
--- a/grpc/python_client/sync_client.py
+++ b/grpc/python_client/sync_client.py
@@ -4,10 +4,11 @@
 import grpc
 import time
 import dronecore_pb2 as dc
-#import dronecore_pb2_grpc
-import action_pb2 as dc_action
+# import dronecore_pb2_grpc
+# import action_pb2 as dc_action
 import action_pb2_grpc
 
+
 def run():
     channel = grpc.insecure_channel('0.0.0.0:50051')
     # stub = dronecore_pb2_grpc.DroneCoreRPCStub(channel)