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v0.17.1.txt
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.. _whatsnew_0171:
v0.17.1 (November ??, 2015)
---------------------------
This is a minor bug-fix release from 0.17.0 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:
.. contents:: What's new in v0.17.1
:local:
:backlinks: none
.. _whatsnew_0171.enhancements:
Enhancements
~~~~~~~~~~~~
- ``DatetimeIndex`` now supports conversion to strings with astype(str) (:issue:`10442`)
- Support for ``compression`` (gzip/bz2) in :meth:`pandas.DataFrame.to_csv` (:issue:`7615`)
- Improve the error message in :func:`pandas.io.gbq.to_gbq` when a streaming insert fails (:issue:`11285`)
- ``pd.read_*`` functions can now also accept :class:`python:pathlib.Path`, or :class:`py:py._path.local.LocalPath`
objects for the ``filepath_or_buffer`` argument. (:issue:`11033`)
- ``DataFrame`` now uses the fields of a ``namedtuple`` as columns, if columns are not supplied (:issue:`11181`)
- Improve the error message displayed in :func:`pandas.io.gbq.to_gbq` when the DataFrame does not match the schema of the destination table (:issue:`11359`)
.. _whatsnew_0171.api:
API changes
~~~~~~~~~~~
- day_of_year and day_of_week accessors for timeseries now exist in addition to dayofyear and dayofweek (standardizes naming conventions) (:issue:`9606`)
- min and max reductions on ``datetime64`` and ``timedelta64`` dtyped series now
result in ``NaT`` and not ``nan`` (:issue:`11245`).
- Regression from 0.16.2 for output formatting of long floats/nan, restored in (:issue:`11302`)
- Prettyprinting sets (e.g. in DataFrame cells) now uses set literal syntax (``{x, y}``) instead of
Legacy Python syntax (``set([x, y])``) (:issue:`11215`)
- Indexing with a null key will raise a ``TypeError``, instead of a ``ValueError`` (:issue:`11356`)
- ``Series.sort_index()`` now correctly handles the ``inplace`` option (:issue:`11402`)
- ``DataFrame.itertuples()`` now returns ``namedtuple`` objects, when possible. (:issue:`11269`)
.. _whatsnew_0171.deprecations:
Deprecations
^^^^^^^^^^^^
- The ``pandas.io.ga`` module which implements ``google-analytics`` support is deprecated and will be removed in a future version (:issue:`11308`)
- Deprecate the ``engine`` keyword from ``.to_csv()``, which will be removed in a future version (:issue:`11274`)
.. _whatsnew_0171.performance:
Performance Improvements
~~~~~~~~~~~~~~~~~~~~~~~~
- Checking monotonic-ness before sorting on an index (:issue:`11080`)
- ``Series.dropna`` performance improvement when its dtype can't contain ``NaN`` (:issue:`11159`)
- Release the GIL on most datetime field operations (e.g. ``DatetimeIndex.year``, ``Series.dt.year``), normalization, and conversion to and from ``Period``, ``DatetimeIndex.to_period`` and ``PeriodIndex.to_timestamp`` (:issue:`11263`)
- Improved performance to ``to_excel`` (:issue:`11352`)
.. _whatsnew_0171.bug_fixes:
Bug Fixes
~~~~~~~~~
- Incorrectly distributed .c file in the build on ``PyPi`` when reading a csv of floats and passing ``na_values=<a scalar>`` would show an exception (:issue:`11374`)
- Bug in ``.to_latex()`` output broken when the index has a name (:issue: `10660`)
- Bug in ``HDFStore.append`` with strings whose encoded length exceded the max unencoded length (:issue:`11234`)
- Bug in merging ``datetime64[ns, tz]`` dtypes (:issue:`11405`)
- Bug in ``HDFStore.select`` when comparing with a numpy scalar in a where clause (:issue:`11283`)
- Bug in using ``DataFrame.ix`` with a multi-index indexer(:issue:`11372`)
- Bug in tz-conversions with an ambiguous time and ``.dt`` accessors (:issue:`11295`)
- Bug in comparisons of Series vs list-likes (:issue:`11339`)
- Bug in ``DataFrame.replace`` with a ``datetime64[ns, tz]`` and a non-compat to_replace (:issue:`11326`, :issue:`11153`)
- Bug in list-like indexing with a mixed-integer Index (:issue:`11320`)
- Bug in ``pivot_table`` with ``margins=True`` when indexes are of ``Categorical`` dtype (:issue:`10993`)
- Bug in ``DataFrame.plot`` cannot use hex strings colors (:issue:`10299`)
- Bug in ``DataFrame.drop_duplicates`` (regression from 0.16.2) causing some non-duplicate rows containing integer values to be dropped (:issue:`11376`)
- Bug in ``pd.eval`` where unary ops in a list error (:issue:`11235`)
- Bug in ``squeeze()`` with zero length arrays (:issue:`11230`, :issue:`8999`)
- Bug in ``DataFrame.to_latex()`` produces an extra rule when ``header=False`` (:issue:`7124`)
- Bug in ``pandas.json`` when file to load is big (:issue:`11344`)
- Bugs in ``to_excel`` with duplicate columns (:issue:`11007`, :issue:`10982`, :issue:`10970`)
- Fixed a bug that prevented the construction of an empty series of dtype
``datetime64[ns, tz]`` (:issue:`11245`).
- Bug in ``read_excel`` with multi-index containing integers (:issue:`11317`)
- Bug in ``to_excel`` with openpyxl 2.2+ and merging (:issue:`11408`)
- Bug in ``DataFrame.to_dict()`` produces a ``np.datetime64`` object instead of ``Timestamp`` when only datetime is present in data (:issue:`11327`)