def _get_level_lengths(index: Index,
sparsify: bool,
hidden_elements: Sequence[int] | None = None):
"""
Given an index, find the level length for each element.
Parameters
----------
index : Index
Index or columns to determine lengths of each element
sparsify : bool
Whether to hide or show each distinct element in a MultiIndex
hidden_elements : sequence of int
Index positions of elements hidden from display in the index affecting
length
Returns
-------
Dict :
Result is a dictionary of (level, initial_position): span
"""
if isinstance(index, MultiIndex):
levels = index.format(sparsify=lib.no_default, adjoin=False)
else:
levels = index.format()
if hidden_elements is None:
hidden_elements = []
lengths = {}
if index.nlevels == 1:
for i, value in enumerate(levels):
if i not in hidden_elements:
lengths[(0, i)] = 1
return lengths
for i, lvl in enumerate(levels):
for j, row in enumerate(lvl):
if not sparsify:
lengths[(i, j)] = 1
elif (row is not lib.no_default) and (j not in hidden_elements):
last_label = j
lengths[(i, last_label)] = 1
elif row is not lib.no_default:
# even if its hidden, keep track of it in case
# length >1 and later elements are visible
last_label = j
lengths[(i, last_label)] = 0
elif j not in hidden_elements:
lengths[(i, last_label)] += 1
non_zero_lengths = {
element: length
for element, length in lengths.items() if length >= 1
}
return non_zero_lengths
def test_index_repr_bool_nan(self):
# GH32146
arr = Index([True, False, np.nan], dtype=object)
exp1 = arr.format()
out1 = ["True", "False", "NaN"]
assert out1 == exp1
exp2 = repr(arr)
out2 = "Index([True, False, nan], dtype='object')"
assert out2 == exp2
def test_format_different_scalar_lengths(self):
# GH#35439
idx = Index(["aaaaaaaaa", "b"])
expected = ["aaaaaaaaa", "b"]
assert idx.format() == expected
