diff --git a/modules/tools/record_play/rtk_player.py b/modules/tools/record_play/rtk_player.py
index 5850bfbd661c1dad09474ac8939731a56290c6de..383629f82402d472c88a77d19d88626efeb25367 100644
--- a/modules/tools/record_play/rtk_player.py
+++ b/modules/tools/record_play/rtk_player.py
@@ -60,7 +60,7 @@ class RtkPlayer(object):
         self.logger.info("Load record file from: %s" % record_file)
         try:
             file_handler = open(record_file, 'r')
-        except:
+        except IOError:
             self.logger.error("Cannot find file: " + record_file)
             file_handler.close()
             sys.exit(0)
@@ -185,7 +185,7 @@ class RtkPlayer(object):
         self.sequence_num = self.sequence_num + 1
 
         self.logger.debug(
-            "publish_planningmsg: before adjust start: self.start = %s, self.end=%s"
+            "publish_planningmsg: before adjust start: self.start=%s, self.end=%s"
             % (self.start, self.end))
         if self.replan or self.sequence_num <= 1 or not self.automode:
             self.logger.info(
@@ -209,7 +209,7 @@ class RtkPlayer(object):
             self.end = len(self.data) - 1
 
         self.logger.debug(
-            "publish_planningmsg: after adjust start: self.start = %s, self.end=%s"
+            "publish_planningmsg: after adjust start: self.start=%s, self.end=%s"
             % (self.start, self.end))
 
         planningdata.total_path_length = self.data['s'][self.end] - \
diff --git a/modules/tools/record_play/rtk_recorder.py b/modules/tools/record_play/rtk_recorder.py
index 63c075a8eed9d28162a4c3d1e082c2b3a8df59dd..36fd45381715301a4aff229f2d6845c3abd1173a 100644
--- a/modules/tools/record_play/rtk_recorder.py
+++ b/modules/tools/record_play/rtk_recorder.py
@@ -135,13 +135,13 @@ class RtkRecord(object):
         cargear = self.chassis.gear_location
 
         if abs(carspeed) >= speed_epsilon:
-            if self.startmoving == False:
+            if self.startmoving is False:
                 self.logger.info(
                     "carspeed !=0 and startmoving is False, Start Recording")
             self.startmoving = True
 
         if self.startmoving:
-            self.cars = self.cars + carspeed * 0.01
+            self.cars += carspeed * 0.01
             self.write(
                 "%s, %s, %s, %s, %s, %s, %s, %.4f, %s, %s, %s, %s, %s, %s\n" %
                 (carx, cary, carz, carspeed, caracceleration, self.carcurvature,