v1.4.4.rst

What's new in 1.4.4 (July ??, 2022)

These are the changes in pandas 1.4.4. See :ref:`release` for a full changelog including other versions of pandas.

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Fixed regressions

• Fixed regression in :meth:`DataFrame.fillna` not working :class:`DataFrame` with :class:`MultiIndex` (:issue:`47649`)
• Fixed regression in taking NULL :class:`objects` from a :class:`DataFrame` causing a segmentation violation. These NULL values are created by :meth:`numpy.empty_like` (:issue:`46848`)
• Fixed regression in :func:`concat` materializing :class:`Index` during sorting even if :class:`Index` was already sorted (:issue:`47501`)
• Fixed regression in calling bitwise numpy ufuncs (for example, np.bitwise_and) on Index objects (:issue:`46769`)
• Fixed regression in :func:`cut` using a datetime64 IntervalIndex as bins (:issue:`46218`)
• Fixed regression in :meth:`DataFrame.select_dtypes` where include="number" included :class:`BooleanDtype` (:issue:`46870`)
• Fixed regression in :meth:`DataFrame.loc` raising error when indexing with a NamedTuple (:issue:`48124`)
• Fixed regression in :meth:`DataFrame.loc` not updating the cache correctly after values were set (:issue:`47867`)
• Fixed regression in :meth:`DataFrame.loc` not aligning index in some cases when setting a :class:`DataFrame` (:issue:`47578`)
• Fixed regression in :meth:`DataFrame.loc` setting a length-1 array like value to a single value in the DataFrame (:issue:`46268`)
• Fixed regression when slicing with :meth:`DataFrame.loc` with :class:`DateOffset`-index (:issue:`46671`)
• Fixed regression in setting None or non-string value into a string-dtype Series using a mask (:issue:`47628`)
• Fixed regression in updating a DataFrame column through Series __setitem__ (using chained assignment) not updating column values inplace and using too much memory (:issue:`47172`)
• Fixed regression in :meth:`DataFrame.select_dtypes` returning a view on the original DataFrame (:issue:`48090`)
• Fixed regression using custom Index subclasses (for example, used in xarray) with :meth:`~DataFrame.reset_index` or :meth:`Index.insert` (:issue:`47071`)
• Fixed regression in :meth:`DatetimeIndex.intersection` when the :class:`DatetimeIndex` has dates crossing daylight savings time (:issue:`46702`)
• Fixed regression in :func:`merge` throwing an error when passing a :class:`Series` with a multi-level name (:issue:`47946`)
• Fixed regression in :meth:`DataFrame.eval` creating a copy when updating inplace (:issue:`47449`)

Bug fixes

• The :class:`errors.FutureWarning` raised when passing arguments (other than filepath_or_buffer) as positional in :func:`read_csv` is now raised at the correct stacklevel (:issue:`47385`)
• Bug in :meth:`DataFrame.to_sql` when method was a callable that did not return an int and would raise a TypeError (:issue:`46891`)
• Bug in :meth:`DataFrameGroupBy.value_counts` where subset had no effect (:issue:`44267`)
• Bug in :meth:`loc.__getitem__` with a list of keys causing an internal inconsistency that could lead to a disconnect between frame.at[x, y] vs frame[y].loc[x] (:issue:`22372`)
• Bug in the :meth:`Series.dt.strftime` accessor return a float instead of object dtype Series for all-NaT input, which also causes a spurious deprecation warning (:issue:`45858`)

Other

• The minimum version of Cython needed to compile pandas is now 0.29.32 (:issue:`47978`)

Contributors

.. contributors:: v1.4.3..v1.4.4|HEAD