ANN: Numexpr 1.4 released

Francesc Alted faltet at
Sun Aug 1 13:34:38 CEST 2010

 Announcing Numexpr 1.4

Numexpr is a fast numerical expression evaluator for NumPy.  With it,
expressions that operate on arrays (like "3*a+4*b") are accelerated
and use less memory than doing the same calculation in Python.

What's new

The main improvement in this version is the support for
multi-threading in pure C.  Threading in C provides the best
performance in nowadays multi-core machines.  In addition, this avoids
the GIL that hampers performance in many Python apps.

Just to wet your appetite, look into this page where the
implementation is briefly described and where some benchmarks are

In case you want to know more in detail what has changed in this
version, see:

or have a look at RELEASE_NOTES.txt in the tarball.

Where I can find Numexpr?

The project is hosted at Google code in:

And you can get the packages from PyPI as well:

Share your experience

Let us know of any bugs, suggestions, gripes, kudos, etc. you may


Francesc Alted

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