Hi!

While rebuilding the python related packages against the Python 3.15rc2
version we found that python-skbio fails to build from source [1].

The error is:
It seems that its open in write only instead of read only as the test
expects, I've created a patch that sets the explicit mode and solves the
problem.

I applied the fix in the sandbox [2] to be able to build the packages
that depend on python-skbio, please consider applying the patch to
support the upcoming 3.15 version.

Setting the severity to important for now. Once Python 3.15 is released,
it will be added to python3-defaults and this bug will become release
critical.

Happy hacking,

[1]: https://debusine.debian.net/debian/r-python-python3.15/artifact/4462291/
[2]: https://debusine.debian.net/debian/r-python-python3.15/