def __init__(self, document, callback):
        '''

        Args:
            document (Document) :
                A Bokeh document that is to be updated.

            callback (SessionCallback) :
                The callback to add

        '''
        super(SessionCallbackAdded, self).__init__(document)
        self.callback = callback
def __init__ ( self , document , callback ) : super ( SessionCallbackAdded , self ) . __init__ ( document ) self . callback = callback
Args:
            document (Document) :
                A Bokeh document that is to be updated.

            callback (SessionCallback) :
                The callback to add