@property<EOL><INDENT>def controller_index(self):<DEDENT>
return self._controller_index<EOL>
The index of the controller, between 0 and 4 (read-only).  Typically this is assigned in the order the
        controllers are detected, however some controllers may have an intrinsic "player number" that is exposed
        through this number.  No two controllers will have the same controller index.