DOC: Add release note for consistent handling of empty values in read_csv with MultiIndex

brandonmonge · brandonmonge · commit 5d42b7c199d2 · 2024-12-03T16:31:37.000-05:00
diff --git a/doc/source/whatsnew/v3.0.0.rst b/doc/source/whatsnew/v3.0.0.rst
@@ -681,6 +681,7 @@ MultiIndex
 - :meth:`DataFrame.melt` would not accept multiple names in ``var_name`` when the columns were a :class:`MultiIndex` (:issue:`58033`)
 - :meth:`MultiIndex.insert` would not insert NA value correctly at unified location of index -1 (:issue:`59003`)
 - :func:`MultiIndex.get_level_values` accessing a :class:`DatetimeIndex` does not carry the frequency attribute along (:issue:`58327`, :issue:`57949`)
+- :func:`read_csv` now handles empty values in :class:`MultiIndex` columns and indexes consistently, replacing them with empty strings instead of "Unnamed: ..." when uniqueness can be ensured. (:issue:`59560`)
 -
 
 I/O

Original file line number	Diff line number	Diff line change
`@@ -681,6 +681,7 @@ MultiIndex`
`681`	`681`	- :meth:`DataFrame.melt` would not accept multiple names in ``var_name`` when the columns were a :class:`MultiIndex` (:issue:`58033`)
`682`	`682`	- :meth:`MultiIndex.insert` would not insert NA value correctly at unified location of index -1 (:issue:`59003`)
`683`	`683`	- :func:`MultiIndex.get_level_values` accessing a :class:`DatetimeIndex` does not carry the frequency attribute along (:issue:`58327`, :issue:`57949`)
	`684`	+- :func:`read_csv` now handles empty values in :class:`MultiIndex` columns and indexes consistently, replacing them with empty strings instead of "Unnamed: ..." when uniqueness can be ensured. (:issue:`59560`)
`684`	`685`	`-`
`685`	`686`
`686`	`687`	`I/O`