v0.23.1.txt

.. _whatsnew_0231:

v0.23.1
-------

This is a minor bug-fix release in the 0.23.x series and includes some small regression fixes
and bug fixes. We recommend that all users upgrade to this version.

.. contents:: What's new in v0.23.1
    :local:
    :backlinks: none

.. _whatsnew_0231.enhancements:

New features
~~~~~~~~~~~~


.. _whatsnew_0231.deprecations:

Deprecations
~~~~~~~~~~~~

-
-

.. _whatsnew_0231.performance:

Performance Improvements
~~~~~~~~~~~~~~~~~~~~~~~~

- Improved performance of :meth:`CategoricalIndex.is_monotonic_increasing`, :meth:`CategoricalIndex.is_monotonic_decreasing` and :meth:`CategoricalIndex.is_monotonic` (:issue:`21025`)
-
-

Documentation Changes
~~~~~~~~~~~~~~~~~~~~~

-
-

.. _whatsnew_0231.bug_fixes:

Bug Fixes
~~~~~~~~~

Groupby/Resample/Rolling
^^^^^^^^^^^^^^^^^^^^^^^^

- Bug in :func:`DataFrame.agg` where applying multiple aggregation functions to a :class:`DataFrame` with duplicated column names would cause a stack overflow (:issue:`21063`)

Strings
^^^^^^^

- Bug in :meth:`Series.str.replace()` where the method throws `TypeError` on Python 3.5.2 (:issue: `21078`)
-

Categorical
^^^^^^^^^^^

- Bug in :func:`pandas.util.testing.assert_index_equal` which raised ``AssertionError`` incorrectly, when comparing two :class:`CategoricalIndex` objects with param ``check_categorical=False`` (:issue:`19776`)

Conversion
^^^^^^^^^^

-
-

Indexing
^^^^^^^^

- Bug in :meth:`Series.reset_index` where appropriate error was not raised with an invalid level name (:issue:`20925`)
-

I/O
^^^

-
-

Plotting
^^^^^^^^

-
-

Reshaping
^^^^^^^^^

-
-

Categorical
^^^^^^^^^^^

-

Numeric
^^^^^^^

- :meth:`~DataFrame.agg` now correctly handles numpy NaN-aware methods like :meth:`numpy.nansum` (:issue:`19629`)
- :meth:`~DataFrame.agg` now correctly handles built-in methods like ``sum`` when axis=1 (:issue:`21134`)