2796     def __init__(self, data=(), datarepr=None):

  2796     def __init__(self, data=(), datarepr=None):

  2797         """

  2797         """

  2798         datarepr: a tuple of (format, obj, ...), a function or an object that

  2798         datarepr: a tuple of (format, obj, ...), a function or an object that

  2799                   provides a printable representation of the given data.

  2799                   provides a printable representation of the given data.

  2800         """

  2800         """

  2801         if not isinstance(data, list):

  2802         if not isinstance(data, list):

  2802             if isinstance(data, set):

  2803             if isinstance(data, set):

  2803                 self._set = data

  2804                 self._set = data

  2804             data = list(data)

  2807             data = list(data)

  2805         self._list = data

  2808         self._list = data

  2806         self._datarepr = datarepr

  2809         self._datarepr = datarepr

  2808 

  2810 

  2809     @util.propertycache

  2811     @util.propertycache

  2810     def _set(self):

  2812     def _set(self):

  2811         return set(self._list)

  2813         return set(self._list)

  2812 

  2814