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__config__.py and SOABI
=======================
Binary builds for different python versions are distinguished by a SOABI tag
sysconfig.get_config_var('SOABI')
e.g. cpython-313-x86_64-linux-gnu
This tag is appended to binary shared libraries compiled by cython,
and allows the module built for different python versions e.g.
python3.13 and python3.14, to be installed alongside each other in the
same installation directory /usr/lib/python3/dist-packages/
But scipy provides a config file scipy/__config__py, accessed as
scipy.__config__, which also includes binary arch-specific information
such as library paths or BLAS build configurations.
In order to continue allowing installation of multiple python
versions, debian has patched __config__py to use a SOABI mechanism.
The config file is renamed as __config__<SOABI>__.py
e.g. __config__cpython-313-x86_64-linux-gnu__.py
and __init__.py loads the SOABI-specific file to ensure that
scipy.__config__ continues to be accessible.
In some cases you might wish to import scipy.__config__ directly.
For instance scipy/linalg/blas.py uses
from scipy.__config__ import CONFIG
to read the BLAS configuration.
This direct import does not work because of the SOABI tag added to __config__.py
Instead, __config__ can be imported dynamically as done in scipy/__init__.py,
import sysconfig
_SOABI = _sysconfig.get_config_var('SOABI')
__config__ = _importlib.import_module('scipy.__config' + ('__'+_SOABI if _SOABI is not None else '') + '__')
del _SOABI
or it can be accessed via scipy
import scipy
CONFIG = scipy.__config__.CONFIG
or alternatively via exceptions
try:
from scipy.__config__ import CONFIG
except ModuleNotFoundError:
# allow for __config__<SOABI>__
import scipy
CONFIG = scipy.__config__.CONFIG
del scipy
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