Fix slice support for @emlyn

Author: Gadgetoid

library/rpi_ws281x/rpi_ws281x.py

@@ -4,6 +4,12 @@
 import atexit
 
 
+try:
+    xrange(0)
+except NameError:
+    xrange = range
+
+
 def Color(red, green, blue, white=0):
     """Convert the provided red, green, blue color to a 24-bit color value.
     Each color component should be a value 0-255 where 0 is the lowest intensity
@@ -27,7 +33,7 @@ def __getitem__(self, pos):
         # Handle if a slice of positions are passed in by grabbing all the values
         # and returning them in a list.
         if isinstance(pos, slice):
-            return [ws.ws2811_led_get(self.channel, n) for n in range(pos.indices(self.size))]
+            return [ws.ws2811_led_get(self.channel, n) for n in xrange(*pos.indices(self.size))]
         # Else assume the passed in value is a number to the position.
         else:
             return ws.ws2811_led_get(self.channel, pos)
@@ -40,7 +46,7 @@ def __setitem__(self, pos, value):
         # LED data values to the provided values.
         if isinstance(pos, slice):
             index = 0
-            for n in range(pos.indices(self.size)):
+            for n in xrange(*pos.indices(self.size)):
                 ws.ws2811_led_set(self.channel, n, value[index])
                 index += 1
         # Else assume the passed in value is a number to the position.