diff --git a/mycobot_320/new_mycobot_320_pi/scripts/mycobot_320_follow_display.py b/mycobot_320/new_mycobot_320_pi/scripts/mycobot_320_follow_display.py
index 7e0f531..6a50e81 100755
--- a/mycobot_320/new_mycobot_320_pi/scripts/mycobot_320_follow_display.py
+++ b/mycobot_320/new_mycobot_320_pi/scripts/mycobot_320_follow_display.py
@@ -1,6 +1,5 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python3
 # -*- coding: utf-8 -*-
-from cgi import print_environ
 import time
 
 import rospy
diff --git a/mycobot_320/new_mycobot_320_pi/scripts/mycobot_320_following_marker.py b/mycobot_320/new_mycobot_320_pi/scripts/mycobot_320_following_marker.py
index c0730fb..64b86d0 100755
--- a/mycobot_320/new_mycobot_320_pi/scripts/mycobot_320_following_marker.py
+++ b/mycobot_320/new_mycobot_320_pi/scripts/mycobot_320_following_marker.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 import time
 
diff --git a/mycobot_320/new_mycobot_320_pi/scripts/mycobot_320_listen_real.py b/mycobot_320/new_mycobot_320_pi/scripts/mycobot_320_listen_real.py
index b65e6e7..0d0d5dc 100755
--- a/mycobot_320/new_mycobot_320_pi/scripts/mycobot_320_listen_real.py
+++ b/mycobot_320/new_mycobot_320_pi/scripts/mycobot_320_listen_real.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 # license removed for brevity
 import time
@@ -28,7 +28,7 @@ def talker():
         "joint6_to_joint5",
         "joint6output_to_joint6",
     ]
-    joint_state_send.velocity = [0]
+    joint_state_send.velocity = [0.0]
     joint_state_send.effort = []
 
     # waiting util server `get_joint_angles` enable.
diff --git a/mycobot_320/new_mycobot_320_pi/scripts/mycobot_320_listen_real_of_topic.py b/mycobot_320/new_mycobot_320_pi/scripts/mycobot_320_listen_real_of_topic.py
index aab2949..51067cb 100755
--- a/mycobot_320/new_mycobot_320_pi/scripts/mycobot_320_listen_real_of_topic.py
+++ b/mycobot_320/new_mycobot_320_pi/scripts/mycobot_320_listen_real_of_topic.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 import math
 
diff --git a/mycobot_320/new_mycobot_320_pi/scripts/mycobot_320_simple_gui.py b/mycobot_320/new_mycobot_320_pi/scripts/mycobot_320_simple_gui.py
index f21dad1..7aa7e69 100755
--- a/mycobot_320/new_mycobot_320_pi/scripts/mycobot_320_simple_gui.py
+++ b/mycobot_320/new_mycobot_320_pi/scripts/mycobot_320_simple_gui.py
@@ -1,6 +1,6 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # -*- coding: utf-8 -*-
-import Tkinter as tk
+import tkinter as tk
 from mycobot_communication.srv import GetCoords, SetCoords, GetAngles, SetAngles, GripperStatus
 import rospy
 import time
diff --git a/mycobot_320/new_mycobot_320_pi/scripts/mycobot_320_slider.py b/mycobot_320/new_mycobot_320_pi/scripts/mycobot_320_slider.py
index 75419f7..829982e 100755
--- a/mycobot_320/new_mycobot_320_pi/scripts/mycobot_320_slider.py
+++ b/mycobot_320/new_mycobot_320_pi/scripts/mycobot_320_slider.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 
 """[summary]
@@ -28,6 +28,7 @@ def callback(data):
 
     mc.send_radians(data_list, 80)
 
+    print('data_list:', data_list)
     # time.sleep(0.5)
 
 
diff --git a/mycobot_320/new_mycobot_320_pi/scripts/mycobot_320_teleop_keyboard.py b/mycobot_320/new_mycobot_320_pi/scripts/mycobot_320_teleop_keyboard.py
index d783db1..5dc0b40 100755
--- a/mycobot_320/new_mycobot_320_pi/scripts/mycobot_320_teleop_keyboard.py
+++ b/mycobot_320/new_mycobot_320_pi/scripts/mycobot_320_teleop_keyboard.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env pytho3
 # -*- coding: utf-8 -*-
 from __future__ import print_function
 from mycobot_communication.srv import GetCoords, SetCoords, GetAngles, SetAngles, GripperStatus