ANN: python-blosc 1.3.1

Francesc Alted faltet at
Thu Apr 7 07:43:36 EDT 2016

Announcing python-blosc 1.3.1

What is new?

This is an important release in terms of stability.  Now, the -O1 flag
for compiling the included C-Blosc sources on Linux.  This represents
slower performance, but fixes the nasty issue #110.  In case maximum
speed is needed, please `compile python-blosc with an external C-Blosc
library <

Also, symbols like BLOSC_MAX_BUFFERSIZE have been replaced for allowing
backward compatibility with python-blosc 1.2.x series.

For whetting your appetite, look at some benchmarks here:

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 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, with added functions (`compress_ptr()`
and `pack_array()`) for efficiently compressing NumPy arrays, minimizing
the number of memory copies during the process.  python-blosc can be
used to compress in-memory data buffers for transmission to other
machines, persistence or just as a compressed cache.

There is also a handy tool built on top of python-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.

Sources repository

The sources and documentation are managed through github services at:


  **Enjoy data!**

Francesc Alted

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