From 0e0dcc7acc3cfa83157d7b810ebe6c4e759723bd Mon Sep 17 00:00:00 2001
From: sap1110 <238814652+sap1110@users.noreply.github.com>
Date: Mon, 17 Aug 2026 13:58:04 +0530
Subject: [PATCH] Declare the license as an SPDX expression instead of a file
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

license = {file = "LICENSE"} makes the backend inline the whole license text
into the METADATA License field, so the built wheel carries a 30-line License
field and PyPI renders the full BSD text where the short name belongs.

Switching to the PEP 639 form emits License-Expression: BSD-3-Clause instead.
The LICENSE file is still shipped, at dist-info/licenses/LICENSE, via
license-files.

The License :: OSI Approved :: BSD License classifier goes with it, since PEP
639 deprecates license classifiers once an expression is declared, and hatchling
is floored at 1.27, the first release that understands these fields.

🤖🍆 Prepared with the help of an AI coding agent, marked as the contributing
guide asks agents to do. Reviewed and tested by me.
---
 pyproject.toml | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/pyproject.toml b/pyproject.toml
index a25d94b6..48ae1300 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,12 +1,13 @@
 [build-system]
-requires = ["hatchling >=1.5"]
+requires = ["hatchling >=1.27"]
 build-backend = "hatchling.build"
 
 [project]
 name = "traitlets"
 authors = [{name = "IPython Development Team", email = "ipython-dev@python.org"}]
 description = "Traitlets Python configuration system"
-license = {file = "LICENSE"}
+license = "BSD-3-Clause"
+license-files = ["LICENSE"]
 readme = "README.md"
 keywords = ["Interactive", "Interpreter", "Shell", "Web"]
 classifiers = [
@@ -15,7 +16,6 @@ classifiers = [
     "Intended Audience :: Developers",
     "Intended Audience :: Science/Research",
     "Intended Audience :: System Administrators",
-    "License :: OSI Approved :: BSD License",
     "Programming Language :: Python :: 3",
     "Programming Language :: Python",
     "Typing :: Typed",