ANN: Pandas 0.21.0 Released

[Tom Augspurger]

Hi,

I'm pleased to announce the availability pandas 0.21.0.

This is a major release from 0.20.3 and includes a number of API changes,
deprecations, new features, enhancements, and performance improvements
along with a large number of bug fixes. We recommend that all users upgrade
to this version.

Highlights include:

- Integration with Apache Parquet <https://parquet.apache.org>, including a
new top-level read_parquet
<http://pandas.pydata.org/pandas-docs/version/0.21/generated/pandas.read_parquet.html#pandas.read_parquet>
function and a DataFrame.to_parquet
<http://pandas.pydata.org/pandas-docs/version/0.21/generated/pandas.DataFrame.to_parquet.html#pandas.DataFrame.to_parquet>
method, see here
<http://pandas.pydata.org/pandas-docs/version/0.21/io.html#io-parquet>.

- New user-facing dtype pandas.api.types.CategoricalDtype
<http://pandas.pydata.org/pandas-docs/version/0.21/generated/pandas.api.types.CategoricalDtype.html#pandas.api.types.CategoricalDtype>
for specifying categoricals independent of the data, see here
<http://pandas.pydata.org/pandas-docs/version/0.21/whatsnew.html#whatsnew-0210-enhancements-categorical-dtype>
.

- The behavior of sum and prod on all-NaN Series/DataFrames is now
consistent and no longer depends on whether bottleneck
<https://kwgoodman.github.io/bottleneck-doc/> is installed, see here
<http://pandas.pydata.org/pandas-docs/version/0.21/whatsnew.html#whatsnew-0210-api-breaking-bottleneck>
.

- Compatibility fixes for pypy, see here
<http://pandas.pydata.org/pandas-docs/version/0.21/whatsnew.html#whatsnew-0210-pypy>
.

- Additions to the drop, reindex, and rename API to make them more
consistent, see here
<http://pandas.pydata.org/pandas-docs/version/0.21/whatsnew.html#whatsnew-0210-enhancements-drop-api>

- Addition of the new methods DataFrame.infer_objects (see here
<http://pandas.pydata.org/pandas-docs/version/0.21/whatsnew.html#whatsnew-0210-enhancements-infer-objects>)
and GroupBy.pipe (see here
<http://pandas.pydata.org/pandas-docs/version/0.21/whatsnew.html#whatsnew-0210-enhancements-groupby-pipe>
).

- Indexing with a list of labels, where one or more of the labels is
missing, is deprecated and will raise a KeyError in a future version, see
here
<http://pandas.pydata.org/pandas-docs/version/0.21/whatsnew.html#whatsnew-0210-api-breaking-loc>
.


Check the whatsnew
<https://pandas.pydata.org/pandas-docs/version/0.21/whatsnew.html> for
detailed changes, including backwards incompatible changes
<http://pandas.pydata.org/pandas-docs/version/0.21/whatsnew.html#backwards-incompatible-api-changes>
and deprecations
<http://pandas.pydata.org/pandas-docs/version/0.21/whatsnew.html#whatsnew-0190-deprecations>.
Please report any issues you find on the pandas issue tracker
<https://github.com/pandas-dev/pandas>.

Binary packages will be available in the defaults and conda-forge channels
shortly.

conda install pandas

Wheels and a source distribution are available on PyPI.

pip install --upgrade pip setuptools
pip install --upgrade --upgrade-strategy=only-if-needed pandas



Tom