Version 0.8.1 (July 22, 2012)

This release includes a few new features, performance enhancements, and over 30 bug fixes from 0.8.0. New features include notably NA friendly string processing functionality and a series of new plot types and options.

New features

• Add vectorized string processing methods accessible via Series.str (GH 620)

• Add option to disable adjustment in EWMA (GH 1584)

• Radviz plot (GH 1566)

• Parallel coordinates plot

• Bootstrap plot

• Per column styles and secondary y-axis plotting (GH 1559)

• New datetime converters millisecond plotting (GH 1599)

• Add option to disable “sparse” display of hierarchical indexes (GH 1538)

• Series/DataFrame’s set_index method can append levels to an existing Index/MultiIndex (GH 1569, GH 1577)

Performance improvements

• Improved implementation of rolling min and max (thanks to Bottleneck !)

• Add accelerated 'median' GroupBy option (GH 1358)

• Significantly improve the performance of parsing ISO8601-format date strings with DatetimeIndex or to_datetime (GH 1571)

• Improve the performance of GroupBy on single-key aggregations and use with Categorical types

• Significant datetime parsing performance improvements

Contributors

A total of 5 people contributed patches to this release. People with a “+” by their names contributed a patch for the first time.

• Chang She

• Skipper Seabold

• Todd DeLuca +

• Vytautas Jancauskas

• Wes McKinney