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a claimless python to c++ converter

Project description


.. image::

What is it?

Pythran is a Python to c++ compiler for a subset of the Python language, with a
focus on scientific computing. It takes a Python module annotated with a few
interface description and turns it into a native python module with the same
interface, but (hopefully) faster.

It is meant to efficiently compile **scientific programs**, and takes advantage
of multi-cores and SIMD instruction units.

Pythran development is currently done using Python version **2.7**.


Pythran sources are hosted on

Pythran releases are hosted on

Pythran is available through Conda on


Using ``pip``

1. Gather dependencies:

Pythran depends on a few Python modules and several C++ libraries. On a debian-like platform, run::

$> sudo apt-get install libgmp-dev libblas-dev
$> sudo apt-get install python-dev python-ply python-networkx python-numpy

2. Use ``easy_install`` or ``pip``::

$> pip install pythran

Using a private debian repo

1. Add serge_sans_paille's debian server to your `source.list`, following the
instruction given in

2. Run the classic::

$> sudo apt-get update
$> sudo apt-get install pythran

Using ``conda``

1. Install ``conda``, following the instruction given in

2. Run::

$> conda install -c serge-sans-paille pythran


Using brew (

$> brew install gmp
$> brew install cmake

$> easy_install pip

$> pip install numpy pythran

Depending on your setup, you may need to add the following to your \\~/.pythranrc`` file::



Using `yaourt`::

$> yaourt -S python2-pythran-git


Using WinPython (, start the WinPython prompt and run::

% pip install pythran

Other Platform

See MANUAL file.

Basic Usage

A simple pythran input could be ````::

Naive dotproduct! Pythran supports
#pythran export dprod(int list, int list)
def dprod(l0,l1):
"""WoW, generator expression, zip and sum."""
return sum(x * y for x, y in zip(l0, l1))

To turn it into a native module, run::

$> pythran

That will generate a native that can be imported just like the former

$> python -c 'import dprod' # this imports the native module instead


The user documentation is available in the MANUAL file from the doc directory.

The developer documentation is available in the DEVGUIDE file from the doc
directory. The also is a TUTORIAL file for those who don't like reading

A todo list is maintained in the eponymous TODO file.

The CLI documentation is available from the pythran help command::

$> pythran --help

Some extra developer documentation is also available using pydoc. Beware, this
is the computer science incarnation for the famous Where's Waldo? game::

$> pydoc pythran
$> pydoc pythran.typing


See the ``pythran/tests/cases/`` directory from the sources.


Praise, flame and cookies:

- -- register at first!

- #pythran on FreeNode


The mailing list archive is available at


See AUTHORS file.


See LICENSE file.

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