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BUG: avoid DeprecationWarning when the Series has index as list of Series (#55395) #56325

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Dec 4, 2023
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BUG: avoid DeprecationWarning when the Series has index as list of Series (#55395) #56325

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2 changes: 2 additions & 0 deletions doc/source/whatsnew/v2.1.4.rst
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Expand Up @@ -21,13 +21,15 @@ Fixed regressions

Bug fixes
~~~~~~~~~
- Bug in :class:`Series` constructor raising DeprecationWarning when ``index`` is a list of :class:`Series` (:issue:`55228`)
- Bug in :meth:`DataFrame.apply` where passing ``raw=True`` ignored ``args`` passed to the applied function (:issue:`55753`)
- Bug in :meth:`Index.__getitem__` returning wrong result for Arrow dtypes and negative stepsize (:issue:`55832`)
- Fixed bug in :func:`to_numeric` converting to extension dtype for ``string[pyarrow_numpy]`` dtype (:issue:`56179`)
- Fixed bug in :meth:`DataFrame.__setitem__` casting :class:`Index` with object-dtype to PyArrow backed strings when ``infer_string`` option is set (:issue:`55638`)
- Fixed bug in :meth:`DataFrame.to_hdf` raising when columns have ``StringDtype`` (:issue:`55088`)
- Fixed bug in :meth:`Index.insert` casting object-dtype to PyArrow backed strings when ``infer_string`` option is set (:issue:`55638`)
- Fixed bug in :meth:`Series.str.translate` losing object dtype when string option is set (:issue:`56152`)
-

.. ---------------------------------------------------------------------------
.. _whatsnew_214.other:
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10 changes: 8 additions & 2 deletions pandas/_libs/lib.pyx
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Expand Up @@ -840,10 +840,16 @@ def is_all_arraylike(obj: list) -> bool:
object val
bint all_arrays = True

from pandas.core.dtypes.generic import (
ABCIndex,
ABCMultiIndex,
ABCSeries,
)

for i in range(n):
val = obj[i]
if not (isinstance(val, list) or
util.is_array(val) or hasattr(val, "_data")):
if (not (isinstance(val, (list, ABCSeries, ABCIndex)) or util.is_array(val))
or isinstance(val, ABCMultiIndex)):
# TODO: EA?
# exclude tuples, frozensets as they may be contained in an Index
all_arrays = False
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18 changes: 8 additions & 10 deletions pandas/tests/series/test_constructors.py
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Expand Up @@ -2150,16 +2150,14 @@ def test_series_constructor_datetimelike_index_coercion(self):
# to DatetimeIndex GH#39307, GH#23598
assert not isinstance(ser.index, DatetimeIndex)

def test_series_constructor_infer_multiindex(self):
index_lists = [["a", "a", "b", "b"], ["x", "y", "x", "y"]]

multi = Series(1.0, index=[np.array(x) for x in index_lists])
assert isinstance(multi.index, MultiIndex)

multi = Series(1.0, index=index_lists)
assert isinstance(multi.index, MultiIndex)

multi = Series(range(4), index=index_lists)
@pytest.mark.parametrize("container", [None, np.array, Series, Index])
@pytest.mark.parametrize("data", [1.0, range(4)])
def test_series_constructor_infer_multiindex(self, container, data):
indexes = [["a", "a", "b", "b"], ["x", "y", "x", "y"]]
if container is not None:
indexes = [container(ind) for ind in indexes]

multi = Series(data, index=indexes)
assert isinstance(multi.index, MultiIndex)


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