convert shebang lines: python -> python3
diff --git a/Demo/turtle/tdemo_I_dontlike_tiltdemo.py b/Demo/turtle/tdemo_I_dontlike_tiltdemo.py
index 1d8652c..1e5c440 100644
--- a/Demo/turtle/tdemo_I_dontlike_tiltdemo.py
+++ b/Demo/turtle/tdemo_I_dontlike_tiltdemo.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python3
""" turtle-example-suite:
tdemo-I_dont_like_tiltdemo.py
diff --git a/Demo/turtle/tdemo_bytedesign.py b/Demo/turtle/tdemo_bytedesign.py
index 2e2ac62..96118b3 100644
--- a/Demo/turtle/tdemo_bytedesign.py
+++ b/Demo/turtle/tdemo_bytedesign.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python3
""" turtle-example-suite:
tdemo_bytedesign.py
diff --git a/Demo/turtle/tdemo_clock.py b/Demo/turtle/tdemo_clock.py
index e186c38..a0d157b 100644
--- a/Demo/turtle/tdemo_clock.py
+++ b/Demo/turtle/tdemo_clock.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python3
# -*- coding: cp1252 -*-
""" turtle-example-suite:
diff --git a/Demo/turtle/tdemo_forest.py b/Demo/turtle/tdemo_forest.py
index 01fa186..a837d84 100644
--- a/Demo/turtle/tdemo_forest.py
+++ b/Demo/turtle/tdemo_forest.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python3
""" turtlegraphics-example-suite:
tdemo_forest.py
diff --git a/Demo/turtle/tdemo_fractalcurves.py b/Demo/turtle/tdemo_fractalcurves.py
index 247f16c..c49f8b8 100644
--- a/Demo/turtle/tdemo_fractalcurves.py
+++ b/Demo/turtle/tdemo_fractalcurves.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python3
""" turtle-example-suite:
tdemo_fractalCurves.py
diff --git a/Demo/turtle/tdemo_lindenmayer_indian.py b/Demo/turtle/tdemo_lindenmayer_indian.py
index bda5067..3925f25 100644
--- a/Demo/turtle/tdemo_lindenmayer_indian.py
+++ b/Demo/turtle/tdemo_lindenmayer_indian.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python3
""" turtle-example-suite:
xtx_lindenmayer_indian.py
diff --git a/Demo/turtle/tdemo_minimal_hanoi.py b/Demo/turtle/tdemo_minimal_hanoi.py
index a8bdca7..cfb78dc 100644
--- a/Demo/turtle/tdemo_minimal_hanoi.py
+++ b/Demo/turtle/tdemo_minimal_hanoi.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python3
""" turtle-example-suite:
tdemo_minimal_hanoi.py
diff --git a/Demo/turtle/tdemo_paint.py b/Demo/turtle/tdemo_paint.py
index 337a57c..68058ab 100644
--- a/Demo/turtle/tdemo_paint.py
+++ b/Demo/turtle/tdemo_paint.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python3
""" turtle-example-suite:
tdemo_paint.py
diff --git a/Demo/turtle/tdemo_peace.py b/Demo/turtle/tdemo_peace.py
index ea57069..63cf7cc 100644
--- a/Demo/turtle/tdemo_peace.py
+++ b/Demo/turtle/tdemo_peace.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python3
""" turtle-example-suite:
tdemo_peace.py
diff --git a/Demo/turtle/tdemo_penrose.py b/Demo/turtle/tdemo_penrose.py
index f816f66..f73c864 100644
--- a/Demo/turtle/tdemo_penrose.py
+++ b/Demo/turtle/tdemo_penrose.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python3
""" xturtle-example-suite:
xtx_kites_and_darts.py
diff --git a/Demo/turtle/tdemo_planet_and_moon.py b/Demo/turtle/tdemo_planet_and_moon.py
index 983449c..14c4bbc 100644
--- a/Demo/turtle/tdemo_planet_and_moon.py
+++ b/Demo/turtle/tdemo_planet_and_moon.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python3
""" turtle-example-suite:
tdemo_planets_and_moon.py
diff --git a/Demo/turtle/tdemo_tree.py b/Demo/turtle/tdemo_tree.py
index fda653c..9c0b1f7 100644
--- a/Demo/turtle/tdemo_tree.py
+++ b/Demo/turtle/tdemo_tree.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python3
""" turtle-example-suite:
tdemo_tree.py
diff --git a/Demo/turtle/tdemo_yinyang.py b/Demo/turtle/tdemo_yinyang.py
index 6508b44..11d1f47 100644
--- a/Demo/turtle/tdemo_yinyang.py
+++ b/Demo/turtle/tdemo_yinyang.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python3
""" turtle-example-suite:
tdemo_yinyang.py
diff --git a/Demo/turtle/turtleDemo.py b/Demo/turtle/turtleDemo.py
index 36bf15c..b5b99c0 100644
--- a/Demo/turtle/turtleDemo.py
+++ b/Demo/turtle/turtleDemo.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python3
import sys
import os
diff --git a/Demo/turtle/turtledemo_two_canvases.py b/Demo/turtle/turtledemo_two_canvases.py
index 57ecb1d..d2d7188 100644
--- a/Demo/turtle/turtledemo_two_canvases.py
+++ b/Demo/turtle/turtledemo_two_canvases.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python3
## DEMONSTRATES USE OF 2 CANVASES, SO CANNOT BE RUN IN DEMOVIEWER!
"""turtle example: Using TurtleScreen and RawTurtle
for drawing on two distinct canvases.