def __init__(
self,
levels: tp.Union[IndexLevel, 'IndexHierarchy'],
):
'''
Args:
levels: IndexLevels instance, or, optionally, an IndexHierarchy to be used to construct a new IndexHierarchy.
labels: a client can optionally provide the labels used to construct the levels, as an optional optimization in forming the IndexHierarchy.
'''
if issubclass(levels.__class__, IndexHierarchy):
if levels.STATIC:
self._levels = levels._levels
else: # must deepcopy labels if not static
self._levels = levels._levels.to_index_level()
self._labels = levels.values
self._depth = levels.depth
self._keys = levels.keys() # immutable keys view can be shared
self._length = self._labels.__len__() #levels.__len__()
self._recache = False
elif isinstance(levels, IndexLevel):
self._levels = levels
# vlaues derived from levels are deferred
self._labels = None
self._depth = None
self._keys = None
self._length = None
self._recache = True
else:
raise NotImplementedError('no handling for creation from', levels)
self.loc = GetItem(self._extract_loc)
self.iloc = GetItem(self._extract_iloc)
def iloc(self) -> GetItem:
return GetItem(self._extract_iloc)
def loc(self):
return GetItem(self._extract_loc)