py3: use six.moves.range instead of xrange

The xrange module  was removed in Python 3 and we should
use 'six.moves.range' instead of 'xrange' to make
code compatible with py 2 and 3 as well.

samples/floatcanvas/DrawBot.py

@@ -14,6 +14,7 @@ I think it's easier with FloatCavnas, and you get zoomign and scrolling to boot!
 """
 
 import wx
+from six import moves
 from math import *
 
 try: # see if there is a local FloatCanvas to use
@@ -53,7 +54,7 @@ class DrawFrame(wx.Frame):
         Canvas = self.Canvas
         phi = (sqrt(5) + 1)/2 - 1
         oradius = 10.0
-        for i in xrange(720):
+        for i in moves.xrange(720):
             radius = 1.5 * oradius * sin(i * pi/720)
             Color = (255*(i / 720.), 255*( i / 720.), 255 * 0.25)
             x = oradius + 0.25*i*cos(phi*i*2*pi)