'Add to the dict using an autoselected key'

def append(self, value):

    if ('_any' in self.rules):
        k = b36((max(([int(k, 36) for k in self.keys()] + [(-1)])) + 1)).lower()
        self[k] = value
        return k
    else:
        raise UsageError(_('Cannot    append    to    fixed    dict'))
