'Remove a roster item from the local storage.
To remove an item from the server, use the remove() method.'

def __delitem__(self, key):

    if (key is None):
        key = JID('')
    if (not isinstance(key, JID)):
        key = JID(key)
    key = key.bare
    if (key in self._jids):
        del self._jids[key]
