diff --git a/src/python/oftest/dataplane.py b/src/python/oftest/dataplane.py
index 97b47a3..232aadf 100644
--- a/src/python/oftest/dataplane.py
+++ b/src/python/oftest/dataplane.py
@@ -64,10 +64,10 @@
     #some nic card have capature problem, will have more bytes capatured.
     if pkt.find(exp_pkt) >=0:
         return True
-    else:      
+    else:
         if self.config["dump_packet"]:
-            self.logger.debug("rx pkt    ->"+(":".join("{:02x}".format(ord(c)) for c in pkt)))
-            self.logger.debug("expect pkt->"+(":".join("{:02x}".format(ord(c)) for c in exp_pkt)))
+            self.logger.debug("rx pkt    ->"+(" ".join("{:02x}".format(ord(c)) for c in pkt)))
+            self.logger.debug("expect pkt->"+(" ".join("{:02x}".format(ord(c)) for c in exp_pkt)))
 
         return False
 
@@ -194,17 +194,17 @@
         if config is None:
             self.config = {}
         else:
-            self.config = config; 
+            self.config = config;
 
         ############################################################
         #
         # The platform/config can provide a custom DataPlanePort class
         # here if you have a custom implementation with different
-        # behavior. 
+        # behavior.
         #
         # Set config.dataplane.portclass = MyDataPlanePortClass
         # where MyDataPlanePortClass has the same interface as the class
-        # DataPlanePort defined here. 
+        # DataPlanePort defined here.
         #
         if "dataplane" in self.config and "portclass" in self.config["dataplane"]:
             self.dppclass = self.config["dataplane"]["portclass"]