v0.16.0rc1

The release candidate for 0.16.0 is now previewing.

This is a major release from 0.15.2 and includes a small number of API changes, several 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:

• DataFrame.assign method
• Series.to_coo/from_coo methods to interact with scipy.sparse
• Backwards incompatible change to Timedelta to conform the .seconds attribute with datetime.timedelta
• Changes to the .loc slicing API to conform with the behavior of .ix
• Changes to the default for ordering in the Categorical constructor

See the Whatsnew for much more information. Please report any issues here