v0.16.2.txt

.. _whatsnew_0162:

v0.16.2 (June 12, 2015)
-----------------------

This is a minor bug-fix release from 0.16.1 and includes a a large number of
bug fixes along several new features, enhancements, and performance improvements.
We recommend that all users upgrade to this version.

Highlights include:

- Documentation on how to use ``numba`` with *pandas*, see :ref:`here <enhancingperf.numba>`

Check the :ref:`API Changes <whatsnew_0162.api>` before updating.

.. contents:: What's new in v0.16.2
    :local:
    :backlinks: none

.. _whatsnew_0162.enhancements:

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

.. _whatsnew_0162.enhancements.other:

Other enhancements
^^^^^^^^^^^^^^^^^^

.. _whatsnew_0162.api:

Backwards incompatible API changes
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

.. _whatsnew_0162.api_breaking:

.. _whatsnew_0162.api_breaking.other:

Other API Changes
^^^^^^^^^^^^^^^^^

- ``Holiday`` now raises ``NotImplementedError`` if both ``offset`` and ``observance`` are used in constructor instead of returning an incorrect result (:issue:`10217`).

.. _whatsnew_0162.performance:

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

- Improved ``Series.resample`` performance with dtype=datetime64[ns] (:issue:`7754`)
- Increase performance of ``str.split`` when ``expand=True`` (:issue:`10081`)

.. _whatsnew_0162.bug_fixes:

Bug Fixes
~~~~~~~~~

- Bug where read_hdf store.select modifies the passed columns list when
  multi-indexed (:issue:`7212`)
- Bug in ``Categorical`` repr with ``display.width`` of ``None`` in Python 3 (:issue:`10087`)
- Bug where some of the nan funcs do not have consistent return dtypes (:issue:`10251`)
- Bug in groupby.apply aggregation for Categorical not preserving categories (:issue:`10138`)
- Bug in ``to_csv`` where ``date_format`` is ignored if the ``datetime`` is fractional (:issue:`10209`)

- Bug in cache updating when consolidating (:issue:`10264`)

- Bug in ``mean()`` where integer dtypes can overflow (:issue:`10172`)
- Bug where Panel.from_dict does not set dtype when specified (:issue:`10058`)
- Bug in ``Index.union`` raises ``AttributeError`` when passing array-likes. (:issue:`10149`)
- Bug in ``Timestamp``'s' ``microsecond``, ``quarter``, ``dayofyear``, ``week`` and ``daysinmonth`` properties return ``np.int`` type, not built-in ``int``. (:issue:`10050`)
- Bug in ``NaT`` raises ``AttributeError`` when accessing to ``daysinmonth``, ``dayofweek`` properties. (:issue:`10096`)


- Bug in getting timezone data with ``dateutil`` on various platforms ( :issue:`9059`, :issue:`8639`, :issue:`9663`, :issue:`10121`)
- Bug in display datetimes with mixed frequencies uniformly; display 'ms' datetimes to the proper precision. (:issue:`10170`)

- Bug in ``Series`` arithmetic methods may incorrectly hold names (:issue:`10068`)

- Bug in ``GroupBy.get_group`` when grouping on multiple keys, one of which is categorical. (:issue:`10132`)

- Bug in ``DatetimeIndex`` and ``TimedeltaIndex`` names are lost after timedelta arithmetics ( :issue:`9926`)


- Bug in `Series.plot(label="LABEL")` not correctly setting the label (:issue:`10119`)

- Bug in `plot` not defaulting to matplotlib `axes.grid` setting (:issue:`9792`)

- Bug in ``Series.align`` resets ``name`` when ``fill_value`` is specified (:issue:`10067`)
- Bug in ``SparseSeries.abs`` resets ``name`` (:issue:`10241`)


- Bug in GroupBy.get_group raises ValueError when group key contains NaT (:issue:`6992`)
- Bug in ``SparseSeries`` constructor ignores input data name (:issue:`10258`)

- Bug where infer_freq infers timerule (WOM-5XXX) unsupported by to_offset (:issue:`9425`)
- Bug in ``DataFrame.to_hdf()`` where table format would raise a seemingly unrelated error for invalid (non-string) column names. This is now explicitly forbidden. (:issue:`9057`)
- Bug to handle masking empty ``DataFrame``(:issue:`10126`)
- Bug where MySQL interface could not handle numeric table/column names (:issue:`10255`)