341     def _update(self, iterable):  argument
346         if isinstance(iterable, BaseSet):
347             data.update(iterable._data)
352         if type(iterable) in (list, tuple, xrange):
355             it = iter(iterable)
368             for element in iterable:
385     def __init__(self, iterable=None):  argument
389         if iterable is not None:
390             self._update(iterable)
410     def __init__(self, iterable=None):  argument
413         if iterable is not None:
414             self._update(iterable)
489     def update(self, iterable):  argument
491         self._update(iterable)