v0.19.2.txt

.. _whatsnew_0192:

v0.19.2 (December ??, 2016)
---------------------------

This is a minor bug-fix release from 0.19.1 and includes some small regression fixes,
bug fixes and performance improvements.
We recommend that all users upgrade to this version.

Highlights include:

- Compatibility with Python 3.6

.. contents:: What's new in v0.19.2
    :local:
    :backlinks: none


.. _whatsnew_0192.performance:

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

- Improved performance of ``.replace()`` (:issue:`12745`)

.. _whatsnew_0192.bug_fixes:

Bug Fixes
~~~~~~~~~

- Compat with ``dateutil==2.6.0``; segfault reported in the testing suite (:issue:`14621`)
- Allow ``nanoseconds`` in ``Timestamp.replace`` as a kwarg (:issue:`14621`)
- Bug in ``pd.read_csv`` where reading files fails, if the number of headers is equal to the number of lines in the file (:issue:`14515`)
- Bug in ``pd.read_csv`` for the Python engine in which an unhelpful error message was being raised when multi-char delimiters were not being respected with quotes (:issue:`14582`)
- Fix bugs (:issue:`14734`, :issue:`13654`) in ``pd.read_sas`` and ``pandas.io.sas.sas7bdat.SAS7BDATReader`` that caused problems when reading a SAS file incrementally.
- Bug in ``pd.read_csv`` for the Python engine in which an unhelpful error message was being raised when ``skipfooter`` was not being respected by Python's CSV library (:issue:`13879`)


- Bug in ``.groupby(..., sort=True)`` of a non-lexsorted MultiIndex when grouping with multiple levels (:issue:`14776`)



- Bug in ``pd.cut`` with negative values and a single bin (:issue:`14652`)
- Bug in ``pd.to_numeric`` where a 0 was not unsigned on a ``downcast='unsigned'`` argument (:issue:`14401`)
- Bug in plotting regular and irregular timeseries using shared axes
  (``sharex=True`` or ``ax.twinx()``) (:issue:`13341`, :issue:`14322`).



- Bug in not propogating exceptions in parsing invalid datetimes, noted in python 3.6 (:issue:`14561`)


- Compat with python 3.6 for pickling of some offsets (:issue:`14685`)
- Compat with python 3.6 for some indexing exception types (:issue:`14684`, :issue:`14689`)
- Compat with python 3.6 for deprecation warnings in the test suite (:issue:`14681`)
- Compat with python 3.6 for Timestamp pickles (:issue:`14689`)
- Bug in resampling a ``DatetimeIndex`` in local TZ, covering a DST change, which would raise ``AmbiguousTimeError`` (:issue:`14682`)



- Bug in ``HDFStore`` when writing a ``MultiIndex`` when using ``data_columns=True`` (:issue:`14435`)
- Bug in ``HDFStore.append()`` when writing a ``Series`` and passing a ``min_itemsize`` argument containing a value for the ``index`` (:issue:`11412`)
- Bug in ``Series.groupby.nunique()`` raising an ``IndexError`` for an empty ``Series`` (:issue:`12553`)
- Bug in ``DataFrame.nlargest`` and ``DataFrame.nsmallest`` when the index had duplicate values (:issue:`13412`)



- Bug in clipboard functions on linux with python2 with unicode and separators (:issue:`13747`)
- Bug in clipboard functions on Windows 10 and python 3 (:issue:`14362`, :issue:`12807`)
- Bug in ``.to_clipboard()`` and Excel compat (:issue:`12529`)


- Bug in ``pd.read_csv()`` in which the ``dtype`` parameter was not being respected for empty data (:issue:`14712`)
- Bug in ``pd.read_csv()`` in which the ``nrows`` parameter was not being respected for large input when using the C engine for parsing (:issue:`7626`)


- Bug in ``pd.merge_asof()`` could not handle timezone-aware DatetimeIndex when a tolerance was specified (:issue:`14844`)

- Explicit check in ``to_stata`` and ``StataWriter`` for out-of-range values when writing doubles (:issue:`14618`)

<<<<<<< HEAD
- Bug in ``.plot(kind='kde')`` which did not drop missing values to generate the KDE Plot, instead generating an empty plot. (:issue:`14821`)
=======
- Bug in ``unstack()`` if called with a list of column(s) as an argument, regardless of the dtypes of all columns, they get coerced to ``object`` (:issue:`11847`)
>>>>>>> master