BUG: Fix Index.get_level_values() with boolean, NaN, NA, NaT names #62392

Original file line number	Diff line number	Diff line change
Expand Up		@@ -1143,6 +1143,7 @@ Other
		- Bug in :meth:`DataFrame.transform` that was returning the wrong order unless the index was monotonically increasing. (:issue:`57069`)
		- Bug in :meth:`DataFrame.where` where using a non-bool type array in the function would return a ``ValueError`` instead of a ``TypeError`` (:issue:`56330`)
		- Bug in :meth:`Index.sort_values` when passing a key function that turns values into tuples, e.g. ``key=natsort.natsort_key``, would raise ``TypeError`` (:issue:`56081`)
	- Bug in :meth:`Index.get_level_values` incorrectly handling boolean, ``np.nan``, ``pd.NA``, and ``pd.NaT`` level names (:issue:`TBD`)
		- Bug in :meth:`MultiIndex.fillna` error message was referring to ``isna`` instead of ``fillna`` (:issue:`60974`)
		- Bug in :meth:`Series.describe` where median percentile was always included when the ``percentiles`` argument was passed (:issue:`60550`).
		- Bug in :meth:`Series.diff` allowing non-integer values for the ``periods`` argument. (:issue:`56607`)
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21 changes: 17 additions & 4 deletions pandas/core/indexes/base.py

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Original file line number	Diff line number	Diff line change
Expand Up		@@ -38,6 +38,7 @@
		is_datetime_array,
		no_default,
		)
	from pandas._libs.missing import is_matching_na
		from pandas._libs.tslibs import (
		OutOfBoundsDatetime,
		Timestamp,
Expand Down Expand Up		@@ -2087,7 +2088,9 @@ def _validate_index_level(self, level) -> None:
		verification must be done like in MultiIndex.

		"""
	if isinstance(level, int):
	if lib.is_integer(level):
	if lib.is_integer(self.name) and self.name == level:
	return
		if level < 0 and level != -1:
		raise IndexError(
		"Too many levels: Index has only 1 level, "
Expand All		@@ -2097,10 +2100,20 @@ def _validate_index_level(self, level) -> None:
		raise IndexError(
		f"Too many levels: Index has only 1 level, not {level + 1}"
		)
	return
	mismatch_error_msg = (
	f"Requested level ({level}) does not match index name ({self.name})"
	)
	if lib.is_integer(self.name):
	raise KeyError(mismatch_error_msg)
	if isna(level) and isna(self.name):
	if not is_matching_na(level, self.name):
	raise KeyError(mismatch_error_msg)
	return
	elif isna(level) or isna(self.name):
	raise KeyError(mismatch_error_msg)
		elif level != self.name:
	raise KeyError(
	f"Requested level ({level}) does not match index name ({self.name})"
	)
	raise KeyError(mismatch_error_msg)

		def _get_level_number(self, level) -> int:
		self._validate_index_level(level)
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4 changes: 2 additions & 2 deletions pandas/core/strings/accessor.py

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Original file line number	Diff line number	Diff line change
Expand Up		@@ -3610,8 +3610,8 @@ def casefold(self):
		>>> s3 = pd.Series(['23', '3', '1⁄5', ''])
		>>> s3.str.isdigit()
		0 True
	1 False
	2 False
	1 True
	2 True
Comment on lines -3613 to +3614 Copy link Contributor @Alvaro-Kothe Alvaro-Kothe Sep 24, 2025 Choose a reason for hiding this comment The reason will be displayed to describe this comment to others. Learn more. These changes are unrelated, please remove them.
		3 False
		dtype: bool
		"""
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