Hi!

While rebuilding the python related packages against the Python 3.15rc1
version we found that ply fails to build from source [1].

 From the information in upstream's repository, ply has been discontinued
and won't be maintained anymore. However, there is a Pull Request that
has the necessary changes to fix this problem [2].

I've applied the PR fix in the sandbox [3] to be able to build the
packages that depend on ply, please consider applying the patch to
support the upcoming 3.15 version.

Happy hacking,

[1]: https://debusine.debian.net/debian/r-python-python3.15/artifact/4341474/
[2]: https://github.com/dabeaz/ply/pull/318
[3]: https://debusine.debian.net/debian/r-python-python3.15