80 

    81 class Universe (object) :

    82     """

    83         An universe of Heads for DMX output.

    84     """

    85 

    86     def __init__ (self, dmx, heads) :

    87         self.dmx = dmx

    88         self.heads = heads

    89 

    90     def __getitem__ (self, name) :

    91         return self.heads[name]

    92 

    93     def __iter__ (self) :

    94         return self.heads.iteritems()

    95 

    96     def update (self, head, attrs) :

    97         """

    98             Update per-head values..

    99         """

   100 

   101         for attr, value in attrs.iteritems():

   102             head[attr] = value

   103         

   104         # output

   105         self.dmx.set(head.channel, *head)

   106