code: def config(self, charm_id, channel=None):
          '''Get the config data for a charm.
  
          @param charm_id The charm's id.
          @param channel Optional channel name.
          '''
          url = '{}/{}/meta/charm-config'.format(self.url, _get_path(charm_id))
          data = self._get(_add_channel(url, channel))
          return data.json(f config(self, charm_id, channel=None):
          '''Get the config data for a charm.
  
          @param charm_id The charm's id.
          @param channel Optional channel name.
          '''
          url = '{}/{}/meta/charm-config'.format(self.url, _get_path(charm_id))
          data = self._get(_add_channel(url, channel))
          return data.json()
docs: Get the config data for a charm.
  
          @param charm_id The charm's id.
          @param channel Optional channel name.