bcolz 0.11.0 released!

Francesc Alted faltet at gmail.com
Wed Sep 9 18:45:59 CEST 2015

Announcing bcolz 0.11.0

What's new

Although this is mostly a maintenance release that fixes some bugs, the
setup.py is enterily based now in setuptools and has been greatly
modernized to use a new versioning system.  Just this deserves a bump in
the minor version.  Thanks to Gabi Davar (@mindw) for such a nice

Also, many improvements in the Continuous Integration part (and hence
not directly visible to users) have been made by Francesc Elies
(@FrancescElies).  Thanks for his quiet but effective work.

And last but not least, I would like to announce that Valentin Haenel
(@esc) just stepped down as release manager.  Thanks Valentin for all
the hard work that you put in making bcolz a better piece of software!

What it is

*bcolz* provides columnar and compressed data containers that can live
either on-disk or in-memory.  Column storage allows for efficiently
querying tables with a large number of columns.  It also allows for
cheap addition and removal of column.  In addition, bcolz objects are
compressed by default for reducing memory/disk I/O needs. The
compression process is carried out internally by Blosc, an
extremely fast meta-compressor that is optimized for binary data. Lastly,
high-performance iterators (like ``iter()``, ``where()``) for querying
the objects are provided.

bcolz can use numexpr internally so as to accelerate many vector and
query operations (although it can use pure NumPy for doing so too).
numexpr optimizes the memory usage and use several cores for doing the
computations, so it is blazing fast.  Moreover, since the carray/ctable
containers can be disk-based, and it is possible to use them for
seamlessly performing out-of-memory computations.

bcolz has minimal dependencies (NumPy), comes with an exhaustive test
suite and fully supports both 32-bit and 64-bit platforms.  Also, it is
typically tested on both UNIX and Windows operating systems.

Together, bcolz and the Blosc compressor, are finally fulfilling the
promise of accelerating memory I/O, at least for some real scenarios:


Other users of bcolz are Visualfabriq (http://www.visualfabriq.com/) the
Blaze project (http://blaze.pydata.org/), Quantopian
(https://www.quantopian.com/) and Scikit-Allel
(https://github.com/cggh/scikit-allel) which you can read more about by
pointing your browser at the links below.

* Visualfabriq:

  * *bquery*, A query and aggregation framework for Bcolz:
  * https://github.com/visualfabriq/bquery

* Blaze:

  * Notebooks showing Blaze + Pandas + BColz interaction:

* Quantopian:

  * Using compressed data containers for faster backtesting at scale:
  * https://quantopian.github.io/talks/NeedForSpeed/slides.html

* Scikit-Allel

  * Provides an alternative backend to work with compressed arrays
  * https://scikit-allel.readthedocs.org/en/latest/bcolz.html


bcolz is in the PyPI repository, so installing it is easy::

    $ pip install -U bcolz


Visit the main bcolz site repository at:


Home of Blosc compressor:

User's mail list:
bcolz at googlegroups.com

License is the new BSD:

Release notes can be found in the Git repository:


  **Enjoy data!**

Francesc Alted

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