v0.20.2.txt

.. _whatsnew_0202:

v0.20.2 (???)
-------------

This is a minor bug-fix release in the 0.20.x series and includes some small regression fixes,
bug fixes and performance improvements.
We recommend that all users upgrade to this version.

Highlights include:

.. contents:: What's new in v0.20.2
    :local:
    :backlinks: none


.. _whatsnew_0202.enhancements:

Enhancements
~~~~~~~~~~~~

- Unblocked access to additional compression types supported in pytables: 'blosc:blosclz, 'blosc:lz4', 'blosc:lz4hc', 'blosc:snappy', 'blosc:zlib', 'blosc:zstd' (:issue:`14478`)

.. _whatsnew_0202.performance:

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

- Performance regression fix when indexing with a list-like (:issue:`16285`)
- Performance regression fix for MultiIndexes (:issue:`16319`, :issue:`16346`)
- Improved performance of ``.clip()`` with scalar arguments (:issue:`15400`)
- Improved performance of groupby with categorical groupers (:issue:`16413`)

.. _whatsnew_0202.bug_fixes:

Bug Fixes
~~~~~~~~~

- Bug in using ``pathlib.Path`` or ``py.path.local`` objects with io functions (:issue:`16291`)
- Bug in ``DataFrame.update()`` with ``overwrite=False`` and ``NaN values`` (:issue:`15593`)



- Fixed a compatibility issue with IPython 6.0's tab completion showing deprecation warnings on Categoricals (:issue:`16409`)


Conversion
^^^^^^^^^^

- Bug in ``pd.to_numeric()`` in which empty data inputs were causing Python to crash (:issue:`16302`)
- Silence numpy warnings when broadcasting DataFrame to Series with comparison ops (:issue:`16378`, :issue:`16306`)


Indexing
^^^^^^^^

- Bug in ``DataFrame.reset_index(level=)`` with single level index (:issue:`16263`)


I/O
^^^

- Bug in pd.read_csv() when comment is passed in space deliminted text files (:issue:`16472`)
- Bug that would force importing of the clipboard routines unnecessarily, potentially causing an import error on startup (:issue:`16288`)
- Bug that raised IndexError HTML-rendering an empty DataFrame (:issue:`15953`)


Plotting
^^^^^^^^

- Bug in ``DataFrame.plot`` with a single column and a list-like ``color`` (:issue:`3486`)
- Bug in ``plot`` where ``NaT`` in ``DatetimeIndex`` results in ``Timestamp.min`` (:issue: `12405`)
- Bug in ``DataFrame.boxplot`` where ``figsize`` keyword was not respected for non-grouped boxplots (:issue:`11959`)




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

- Bug creating datetime rolling window on an empty DataFrame (:issue:`15819`)


Sparse
^^^^^^

- Bug in construction of SparseDataFrame from ``scipy.sparse.dok_matrix`` (:issue:`16179`)

Reshaping
^^^^^^^^^

- Bug in ``DataFrame.stack`` with unsorted levels in MultiIndex columns (:issue:`16323`)
- Bug in ``pd.wide_to_long()`` where no error was raised when ``i`` was not a unique identifier (:issue:`16382`)
- Bug in ``Series.isin(..)`` with a list of tuples (:issue:`16394`)
- Bug in construction of a ``DataFrame`` with mixed dtypes including an all-NaT column. (:issue:`16395`)


Numeric
^^^^^^^
- Bug in .interpolate(), where limit_direction was not respected when limit=None (default) was passed (:issue:16282)

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

- Fixed comparison operations considering the order of the categories when both categoricals are unordered (:issue:`16014`)

Other
^^^^^

- Bug in ``pd.drop([])`` for DataFrame with non-unique indices (:issue:`16270`)