Dear Ole,
On Fri, 5 Dec 2025 19:53:10 +0100 Ole Streicher <[email protected]> wrote:
Package: python3-numcodecs
Version: 0.16.5+ds-1
Severity: serious
Control: affects -1 src:sunpy
With Python 3.14, numcodecs cannot be imported anymore:
$ python3.14
Python 3.14.0 (main, Dec 1 2025, 11:18:59) [GCC 15.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import numcodecs
Traceback (most recent call last):
File "<python-input-0>", line 1, in <module>
import numcodecs
File "/usr/lib/python3/dist-packages/numcodecs/__init__.py", line 43,
in <module>
from numcodecs import blosc
ImportError: cannot import name 'blosc' from partially initialized
module 'numcodecs' (most likely due to a circular import)
(/usr/lib/python3/dist-packages/numcodecs/__init__.py)
This blocks the compilation of (the new version of) Sunpy.
I have the same issue with satpy but I think that the issue is just that
numcodecs has been not re-built yet to generate the extension modules
for Python 3.14.
It is indeed part of the python3.14-add transition:
https://release.debian.org/transitions/html/python3.14-add.html
I can confirm that the package builds perfectly locally (x86_64).
kind regards
--
Antonio Valentino
