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Date: Mon, 6 Feb 2012 21:02:33 +0000
Message-ID: <CANg26EXE-iKCgkyG=2ykKjYSnRU0HFz7hVz9K8Gjq=0UPdg...@mail.gmail.com>
Subject: Re: [cython-users] Python to Cython conversion
From: mark florisson <markflorisso...@gmail.com>
To: cython-users@googlegroups.com
Content-Type: text/plain; charset=UTF-8

On 5 February 2012 23:19, Waqas Muhi <waqas.m...@gmail.com> wrote:
> Hello,
>
> I'm currently working on a project for my Master's which involves optimizing
> a fairly big simulation system originally written in Python. I've read about
> and researched Cython and I think it would give me the best performance
> improvements. My software system basically is a bunch of Python .py files
> and the top-level module makes use of functions defined in them as
> appropriate.
>
> Based on some profiling, I've been able to identify a few of the .py files
> which are good candidates for the conversion. In particular, there are a few
> functions in one particular file - let's say xyz.py - which I'm looking to
> convert. My questions are:
>
> 1) Is it possible to convert a few of the functions to Cython and leave the
> rest with the original Python code?

Sure.

> 2) Would I have to rename the file to use the .pyx extension if the above is
> possible?

Yes, I believe that if you use the .py extension Cython expects a
pure-mode Python file (possibly annotated with Cython types etc).
That's probably not what you want.

> 3) If 1) is not possible, would file xyz.py still work properly with the
> other .py files in the software system if I do a full conversion to Cython?
> In other words, would anything change from the other files' perspective?

You can keep xyz.py and have it import performance-critical functions
from _xyz.pyx.

> Any feedback would be highly appreciated. Thanks a lot!

Just give the Cython tutorials a go and it will be a lot clearer to you :)

> Waqas