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FIX BUG: Series constructor from dictionary drops key (index) levels when not all keys have same number of entries #60695 #60814

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FIX BUG: Series constructor from dictionary drops key (index) levels when not all keys have same number of entries #60695 #60814

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3 changes: 2 additions & 1 deletion pandas/core/indexes/multi.py
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Original file line number Diff line number Diff line change
Expand Up @@ -9,6 +9,7 @@
Sequence,
)
from functools import wraps
from itertools import zip_longest
from sys import getsizeof
from typing import (
TYPE_CHECKING,
Expand Down Expand Up @@ -591,7 +592,7 @@ def from_tuples(
elif isinstance(tuples, list):
arrays = list(lib.to_object_array_tuples(tuples).T)
else:
arrs = zip(*tuples)
arrs = zip_longest(*tuples)
arrays = cast(list[Sequence[Hashable]], arrs)

return cls.from_arrays(arrays, sortorder=sortorder, names=names)
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8 changes: 8 additions & 0 deletions pandas/tests/indexes/multi/test_constructors.py
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Expand Up @@ -409,6 +409,14 @@ def test_from_tuples_with_tuple_label():
result = pd.DataFrame([2, 3], columns=["c"], index=idx)
tm.assert_frame_equal(expected, result)

@pytest.mark.parametrize("keys, expected", (
((("l1",), ("l1","l2")), (("l1", np.nan), ("l1","l2"))),
((("l1","l2",), ("l1",)), (("l1","l2"), ("l1", np.nan))),
))
def test_from_tuples_with_various_tuple_lengths(keys, expected):
# Issue 60695
idx = MultiIndex.from_tuples(keys)
assert tuple(idx) == expected

# ----------------------------------------------------------------------------
# from_product
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