code: def from_ivorn(cls, ivorn, nside=256):
          
          return cls.from_url('%s?%s' % (MOC.MOC_SERVER_ROOT_URL,
                                         urlencode({
                                             'ivorn': ivorn,
                                             'get': 'moc',
                                             'order': int(np.log2(nside))
                                         })))
docs: Creates a `~mocpy.moc.MOC` object from a given ivorn.
  
          Parameters
          ----------
          ivorn : str
          nside : int, optional
              256 by default
  
          Returns
          -------
          result : `~mocpy.moc.MOC`
              The resulting MOC.