(self, callback)
callback - Callable, will be called when an insert, delete or replace
                   action on the text widget may require updating the shell
                   sidebar.
callback - Callable, will be called when an insert, delete or replace
                   action on the text widget may require updating the shell
                   sidebar.
callback - Callable will be called when an insert delete or replace action on the text widget may require updating the shell sidebar .
def __init__(self, callback):
        """
        callback - Callable, will be called when an insert, delete or replace
                   action on the text widget may require updating the shell
                   sidebar.
        """
        Delegator.__init__(self)
        self.callback = callback
def __init__ ( self , callback ) : Delegator . __init__ ( self ) self . callback = callback