v0.24.1.rst

orphan:

Whats New in 0.24.1 (February XX, 2019)

Warning

The 0.24.x series of releases will be the last to support Python 2. Future feature releases will support Python 3 only. See :ref:`install.dropping-27` for more.

{{ header }}

These are the changes in pandas 0.24.1. See :ref:`release` for a full changelog including other versions of pandas. See :ref:`whatsnew_0240` for the 0.24.0 changelog.

API Changes

Changing the sort parameter for :class:`Index` set operations

The default sort value for :meth:`Index.union` has changed from True to None (:issue:`24959`). The default behavior, however, remains the same: the result is sorted, unless

1. self and other are identical
2. self or other is empty
3. self or other contain values that can not be compared (a RuntimeWarning is raised).

This change will allow sort=True to mean "always sort" in a future release.

The same change applies to :meth:`Index.difference` and :meth:`Index.symmetric_difference`, which would not sort the result when the values could not be compared.

The sort option for :meth:`Index.intersection` has changed in three ways.

1. The default has changed from True to False, to restore the pandas 0.23.4 and earlier behavior of not sorting by default.
2. The behavior of sort=True can now be obtained with sort=None. This will sort the result only if the values in self and other are not identical.
3. The value sort=True is no longer allowed. A future version of pandas will properly support sort=True meaning "always sort".

Fixed Regressions

• Bug in :meth:`DataFrame.itertuples` with records orient raising an AttributeError when the DataFrame contained more than 255 columns (:issue:`24939`)
• Bug in :meth:`DataFrame.itertuples` orient converting integer column names to strings prepended with an underscore (:issue:`24940`)
• Fixed regression in :func:`read_sql` when passing certain queries with MySQL/pymysql (:issue:`24988`).
• Fixed regression in :class:`Index.intersection` incorrectly sorting the values by default (:issue:`24959`).
• Fixed regression in :func:`merge` when merging an empty DataFrame with multiple timezone-aware columns on one of the timezone-aware columns (:issue:`25014`).
• Fixed regression in :meth:`Series.rename_axis` and :meth:`DataFrame.rename_axis` where passing None failed to remove the axis name (:issue:`25034`)

Timedelta

• Bug in :func:`to_timedelta` with box=False incorrectly returning a datetime64 object instead of a timedelta64 object (:issue:`24961`)

Reshaping

• Bug in :meth:`DataFrame.groupby` with :class:`Grouper` when there is a time change (DST) and grouping frequency is '1d' (:issue:`24972`)

Visualization

• Fixed the warning for implicitly registered matplotlib converters not showing. See :ref:`whatsnew_0211.converters` for more (:issue:`24963`).

Other

• Fixed AttributeError when printing a DataFrame's HTML repr after accessing the IPython config object (:issue:`25036`)

Contributors

.. contributors:: v0.24.0..v0.24.1