def disconnect(self, key=None, func=None):
        """Disconnect the connections to the an rcParams key

        Parameters
        ----------
        key: str
            The rcParams key. If None, all keys are used
        func: function
            The function that is connected. If None, all functions are
            connected
        """
        if key is None:
            for key, connections in self._connections.items():
                for conn in connections[:]:
                    if func is None or conn is func:
                        connections.remove(conn)
        else:
            connections = self._connections[key]
            for conn in connections[:]:
                if func is None or conn is func:
                    connections.remove(conn)
Disconnect the connections to the an rcParams key

        Parameters
        ----------
        key: str
            The rcParams key. If None, all keys are used
        func: function
            The function that is connected. If None, all functions are
            connected