. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.1.2.1 Improvements to the Parquet IO functionality . . . . . . . . . . . . . . . . . . . . 4 1.1.2.2 Other Enhancements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.1.4 Performance Improvements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.1.5 Bug Fixes . . version deprecations/changes . . . . . . . . . . . . . . . . . . . . . . . . 27 1.2.5 Performance Improvements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 1.2.6 Documentation

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.2.2 Performance Improvements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.2.3 Bug Fixes . . version deprecations/changes . . . . . . . . . . . . . . . . . . . . . . . . 42 1.3.6 Performance Improvements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 1.3.7 Bug Fixes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 1.4.2 Performance Improvements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49 1.4.3 Bug Fixes . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.1.2 Performance Improvements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.1.3 Bug Fixes . . version deprecations/changes . . . . . . . . . . . . . . . . . . . . . . . . 40 1.2.6 Performance Improvements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 1.2.7 Bug Fixes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 1.3.2 Performance Improvements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 1.3.3 Bug Fixes . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.1.1 Performance Improvements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.1.2 Bug Fixes . . version deprecations/changes . . . . . . . . . . . . . . . . . . . . . . . . 37 1.2.5 Performance Improvements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 1.2.6 Bug Fixes . . syntax with window and resample operations . . . . . . . . . . . . . . . . 45 Method chaininng improvements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47 Partial string indexing

version deprecations/changes . . . . . . . . . . . . . . . . . . . . . . . . 35 1.1.5 Performance Improvements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 1.1.6 Bug Fixes . . syntax with window and resample operations . . . . . . . . . . . . . . . . 44 i Method chaininng improvements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 Partial string indexing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 1.2.4 Performance Improvements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 1.2.5 Bug Fixes . .

about what’s in the library. 2 CONTENTS CHAPTER ONE WHAT’S NEW These are new features and improvements of note in each release. 1.1 v0.17.0 (October 9, 2015) This is a major release from 0.16.2 and 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. Other API Changes – Deprecations – Removal of prior version deprecations/changes • Performance Improvements • Bug Fixes 1.1.1 New features Datetime with TZ We are adding an implementation that natively

about what’s in the library. 2 CONTENTS CHAPTER ONE WHAT’S NEW These are new features and improvements of note in each release. 1.1 v0.15.2 (December 12, 2014) This is a minor release from 0.15.1 performance improvements. A small number of API changes were necessary to fix existing bugs. We recommend that all users upgrade to this version. • Enhancements • API Changes • Performance Improvements • Bug includes a small number of API changes, several new features, en- hancements, and performance improvements along with a large number of bug fixes. We recommend that all users upgrade to this version.

about what’s in the library. 2 CONTENTS CHAPTER ONE WHAT’S NEW These are new features and improvements of note in each release. 1.1 v0.15.1 (November 9, 2014) This is a minor bug-fix release from includes a small number of API changes, several new features, en- hancements, and performance improvements along with a large number of bug fixes. We recommend that all users upgrade to this version. 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.

about what’s in the library. 2 CONTENTS CHAPTER ONE WHAT’S NEW These are new features and improvements of note in each release. 1.1 v0.12.0 (July 24, 2013) This is a major release from 0.11.0 and method can append levels to an existing Index/MultiIndex (GH1569, GH1577) 1.7.2 Performance improvements • Improved implementation of rolling min and max (thanks to Bottleneck !) • Add accelerated pandas: powerful Python data analysis toolkit, Release 0.12.0 1.8.3 Time series changes and improvements Note: With this release, legacy scikits.timeseries users should be able to port their code to

• Added to the list of default NA values for read_csv() (GH30821) 1.5.15 Documentation Improvements • Added new section on Scaling to large datasets (GH28315). • Added sub-section on Query MultiIndex DatetimeIndex will now return an object array of tz-aware Timestamp (GH24596) • 1.8 Performance improvements • Performance improvement in DataFrame arithmetic and comparison operations with scalars (GH24990 or higher. Note: You are highly encouraged to install these libraries, as they provide speed improvements, especially when working with large data sets. Optional dependencies Pandas has many optional