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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def remove_handler(self, handler: Handler, group: int = 0):
 """Removes a previously-added update handler. Make sure to provide the right group that the handler was added in. You can use the return value of the :meth:`add_handler` method, a tuple of (handler, group), and pass it directly. Args: handler (``Handler``):
 The handler to be removed. group (``int``, *optional*):
 The group identifier, defaults to 0. """

        if isinstance(handler, DisconnectHandler):
            self.disconnect_handler = None
        else:
            self.dispatcher.remove_handler(handler, group)