async def clearconfig(self, key):
        """
        Clear a configuration variable.
        The variable will be reset to its default value.

        arg:str:key:name of the configuration variable
        """
        self._setconfig(key, None)

        Clear a configuration variable.
        The variable will be reset to its default value.

        arg:str:key:name of the configuration variable
        
electrum/commands.py