code: def __callHandler(self, callback, event, *params):
          
          if callback is not None:
              event.hook = self
              callback(event, *params)
docs: Calls a "pre" or "post" handler, if set.
  
          @type  callback: function
          @param callback: Callback function to call.
  
          @type  event: L{ExceptionEvent}
          @param event: Breakpoint hit event.
  
          @type  params: tuple
          @param params: Parameters for the callback function.