ANN: python-blosc 1.2.8 released

Francesc Alted faltet at
Wed Sep 16 13:12:58 CEST 2015

Announcing python-blosc 1.2.8

What is new?

This is a maintenance release.  Internal C-Blosc has been upgraded to
1.7.0 (although new bitshuffle support has not been made public, as it
seems not ready for production yet).

Also, there is support for bytes-like objects that support the buffer
interface as input to ``compress`` and ``decompress``. On Python 2.x
this includes unicode, on Python 3.x it doesn't.  Thanks to Valentin

Finally, a memory leak in ``decompress```has been hunted and fixed.  And
new tests have been added to catch possible leaks in the future.  Thanks
to Santi Villalba.

For more info, you can have a look at the release notes in:

More docs and examples are available in the documentation site:

What is it?

Blosc ( is a high performance compressor
optimized for binary data.  It has been designed to transmit data to
the processor cache faster than the traditional, non-compressed,
direct memory fetch approach via a memcpy() OS call.

Blosc is the first compressor that is meant not only to reduce the size
of large datasets on-disk or in-memory, but also to accelerate object
manipulations that are memory-bound
(  See for some benchmarks on
how much speed it can achieve in some datasets.

Blosc works well for compressing numerical arrays that contains data
with relatively low entropy, like sparse data, time series, grids with
regular-spaced values, etc.

python-blosc ( is the Python wrapper for
the Blosc compression library.

There is also a handy tool built on Blosc called Bloscpack
( It features a commmand line
interface that allows you to compress large binary datafiles on-disk.
It also comes with a Python API that has built-in support for
serializing and deserializing Numpy arrays both on-disk and in-memory at
speeds that are competitive with regular Pickle/cPickle machinery.


python-blosc is in PyPI repository, so installing it is easy:

$ pip install -U blosc  # yes, you must omit the 'python-' prefix

Download sources

The sources are managed through github services at:


There is Sphinx-based documentation site at:

Mailing list

There is an official mailing list for Blosc at:

blosc at


Both Blosc and its Python wrapper are distributed using the MIT license.

for more details.


  **Enjoy data!**

Francesc Alted

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