Update demos for python3

Author: dwalton76

demo/BALANC3R

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 import logging
 from ev3dev.GyroBalancer import GyroBalancer

demo/MINDCUB3R/rubiks.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 from ev3dev.auto import OUTPUT_A, OUTPUT_B, OUTPUT_C, InfraredSensor
 from ev3dev.helper import LargeMotor, MediumMotor, ColorSensor, MotorStall

demo/MINDCUB3R/rubiks_rgb_solver.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 from itertools import permutations
 from math import atan2, cos, degrees, exp, factorial, radians, sin, sqrt

demo/lego_official_projects/EV3D4.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 import logging
 import sys

demo/lego_official_projects/EV3D4RemoteControl

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 from EV3D4 import EV3D4RemoteControlled
 import logging

demo/lego_official_projects/EV3D4WebControl

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 from EV3D4 import EV3D4WebControlled
 import logging

demo/lego_official_projects/TRACK3R.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 import logging
 import sys
@@ -35,7 +35,7 @@ def __init__(self, medium_motor=OUTPUT_A, left_motor=OUTPUT_B, right_motor=OUTPU
 
     def fire_ball(self, state):
         if state:
-            self.medium_motor.run_to_rel_pos(duty_cycle_sp=100, position_sp=3*360)
+            self.medium_motor.run_to_rel_pos(speed_sp=100, position_sp=3*360)
         else:
             self.medium_motor.stop()
 
@@ -48,7 +48,7 @@ def __init__(self, medium_motor=OUTPUT_A, left_motor=OUTPUT_B, right_motor=OUTPU
 
     def spinner(self, state):
         if state:
-            self.medium_motor.run_forever(duty_cycle_sp=50)
+            self.medium_motor.run_forever(speed_sp=50)
         else:
             self.medium_motor.stop()
 
@@ -61,6 +61,6 @@ def __init__(self, medium_motor=OUTPUT_A, left_motor=OUTPUT_B, right_motor=OUTPU
 
     def move_claw(self, state):
         if state:
-            self.medium_motor.run_to_rel_pos(duty_cycle_sp=40, position_sp=-75)
+            self.medium_motor.run_to_rel_pos(speed_sp=40, position_sp=-75)
         else:
-            self.medium_motor.run_to_rel_pos(duty_cycle_sp=40, position_sp=75)
+            self.medium_motor.run_to_rel_pos(speed_sp=40, position_sp=75)

demo/lego_official_projects/TRACK3RWithBallShooter

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 import logging
 from TRACK3R import TRACK3RWithBallShooter

demo/lego_official_projects/TRACK3RWithClaw

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 import logging
 from TRACK3R import TRACK3RWithClaw

demo/lego_official_projects/TRACK3RWithSpinner

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 import logging
 from TRACK3R import TRACK3RWithSpinner