Integrating Python, was Re: The New Product

Stefan Csomor csomor at
Tue Sep 13 12:56:39 UTC 2022

Hi Nick

The sample does work with your installation ?

You cannot return a value from a file executed in python, only from methods. Your sample in my setup results in a "Hello World" in the Trace log though, so it is running ... I haven't added passing arguments into $runfile either. You should communicate through the omnis module using python calls as in the sample.



Am 13.09.22, 11:24 schrieb "omnisdev-en im Auftrag von Nick Renders" <omnisdev-en-bounces at im Auftrag von omnis1 at>:

    Hi Stefan,

    Thank you very much for sharing your oPython external.
    As a Python newbie, I am having a bit of a problem getting it to run, though.

    I am trying to run a simple file with the following contents:

    	print("Hello World")

    and the following Omnis code:

    	Do oPy3Lib.$runfile("/Volumes/Free/","__main__") Returns #S1

    but #S1 remains empty.

    I am probably making some rookie mistake.
    Is this how the $runfile function is supposed to work?
    Does it return anything that is printed?

    And on a related note, is it possible to specify arguments (sys.argv value) with the $runfile function?


    Nick Renders

    On 29 May 2022, at 17:15, Stefan Csomor wrote:

    > Hi
    >>   But a good python integration literally opens up the whole of the python
    >>   extensions world to be available inside Omnis.
    > I've done a presentation of Python integration into Omnis in 2008, I've also pushed the code to github, updated for Python 3, but this was rather for integrating Python into the main / GUI thread.
    > The problem with background language workers using python is that CPython itself is not very well suited to profit from multiple cores when multithreading - there still is a global object GIL (Global Interpreter Lock) that each thread has to acquire when active, so in order to really profit from multi-core / multi-processor machines you'd have to use a multi-process solution, which is a little bit more complex. (When your python multi-threaded code is primarily IO bound or effectively wrapping a c-library that itself is benefitting from multiple cores then things are different of course).
    > Just my 0.02$
    > Best,
    > Stefan
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