Hi!

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

The error is:
E       importlib.metadata.MetadataNotFound: No package metadata was found.

This is caused by a change in behavior in Python 3.15. To fix it, I applied a backport of the upstream commit fe58ab5: Expect dist.metadata to be None or raise an exception if invalid [2]

I've applied the upstream fix in the sandbox [3] to verify that it builds successfully, 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/4543463/
[2]: https://github.com/naiquevin/pipdeptree/commit/fe58ab592919a3bc7f0be199067956a422eee678
[3]: https://debusine.debian.net/debian/r-python-python3.15/

Hello,

Bug #1148921 in python-pipdeptree reported by you has been fixed in the
Git repository and is awaiting an upload. You can see the commit
message below and you can check the diff of the fix at:

https://salsa.debian.org/python-team/packages/python-pipdeptree/-/commit/ff16e41bcaa73d211793678abe4ff4d48d0faf76
------------------------------------------------------------------------
Cherry-pick upstream patch for Python 3.15 compatibility

Thanks to Maximiliano Curia for forwarding the patch

Closes: #1148921
------------------------------------------------------------------------

(this message was generated automatically)
-- 
Greetings

https://bugs.debian.org/1148921

We believe that the bug you reported is fixed in the latest version of
python-pipdeptree, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 1148921@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Stuart Prescott <stuart@debian.org> (supplier of updated python-pipdeptree package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)
Format: 1.8
Date: Mon, 28 Sep 2026 15:41:42 +1000
Source: python-pipdeptree
Architecture: source
Version: 2.30.0-2
Distribution: unstable
Urgency: medium
Maintainer: Debian Python Team <team+python@tracker.debian.org>
Changed-By: Stuart Prescott <stuart@debian.org>
Closes: 1148921
Changes:
 python-pipdeptree (2.30.0-2) unstable; urgency=medium
 .
   * Team upload.
   * Cherry-pick upstream patch for Python 3.15 compatibility, with thanks to
     Maximiliano Curia for forwarding the patch (Closes: #1148921).
   * Update Standards-Version to 4.7.4 (no changes required).
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