This must be determined by the following parameter -- http://stackoverflow.com/a/38525461/94687 :

$ python3
Python 3.5.1 (default, May  5 2016, 10:50:17) 
[GCC 5.3.1 20151207 (ALT Linux 5.3.1-alt3)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from distutils.sysconfig import get_config_var
>>> get_config_var('EXT_SUFFIX')
'.cpython-35m.so'
>>>

In Sisyphus, the fix of EXT_SUFFIX Python config parameter (bringing it to the more common format) will be convenient to make together with the move to Python 3.6. (The binary modules would anyway require a rebuild.)

(As for p8, this should be decided separately. Recognizing the common suffix in addition to ours could be a solution with little hassle; otherwise, if we change this parameter for the newly built modules, we'd need to track this with Provides/Requires to ensure both kinds of modules would be usable.)

(In reply to comment #2)
> In Sisyphus, the fix of EXT_SUFFIX Python config parameter (bringing it to the
> more common format) will be convenient to make together with the move to Python
> 3.6. (The binary modules would anyway require a rebuild.)

This is quite clear how to do.

> (As for p8, this should be decided separately. Recognizing the common suffix in
> addition to ours could be a solution with little hassle; otherwise, if we
> change this parameter for the newly built modules, we'd need to track this with
> Provides/Requires to ensure both kinds of modules would be usable.)

This is less clear and requires hacking of a different piece of code (module finding).

Patches (and tasks for p8) are welcome!

See also: https://bugs.python.org/issue16754 which introduced the use of EXT_SUFFIX into the code.

Created attachment 7140 [details]
new triplet removal patch

This new triplet removal patch provides both two-part and five-part EXT_SUFFIX (e. g. cpython-35m and cpython-35m-i386-linux-gnu) when searching for .so module, so 3rd-party wheels can be installed and used along with ALT native packages.

This new triplet removal patch provides both two-part and five-part EXT_SUFFIX (e. g. cpython-35m and cpython-35m-i386-linux-gnu) when searching for .so module, so 3rd-party wheels can be installed and used along with ALT native packages.

See also task 185232

* Mon Jul 10 2017 Fr. Br. George <george@altlinux.ru> 3.5.1-alt9                 
- Add PLATFORM_TRIPLET suffix for binary module search