From 09d36f046d1f4f73e74125726923de189e34f3c0 Mon Sep 17 00:00:00 2001
From: Karolina Surma <ksurma@redhat.com>
Date: Tue, 7 Jan 2025 12:52:35 +0100
Subject: [PATCH] Show License-Expression if present in package metadata

With Core Metadata 2.4 a new field, License-Expression, has been added.
If it's present, favor it over the deprecated (with PEP 639) legacy
unstructured License field.

Closes: #13112
---
 news/13112.feature.rst             | 1 +
 src/pip/_internal/commands/show.py | 9 ++++++++-
 2 files changed, 9 insertions(+), 1 deletion(-)
 create mode 100644 news/13112.feature.rst

diff --git a/news/13112.feature.rst b/news/13112.feature.rst
new file mode 100644
index 00000000000..e2c85ea5629
--- /dev/null
+++ b/news/13112.feature.rst
@@ -0,0 +1 @@
+Prefer to display ``License-Expression`` in ``pip show`` if metadata version is at least 2.4.
\ No newline at end of file
diff --git a/src/pip/_internal/commands/show.py b/src/pip/_internal/commands/show.py
index c54d548f5fb..b47500cf8b4 100644
--- a/src/pip/_internal/commands/show.py
+++ b/src/pip/_internal/commands/show.py
@@ -66,6 +66,7 @@ class _PackageInfo(NamedTuple):
     author: str
     author_email: str
     license: str
+    license_expression: str
     entry_points: List[str]
     files: Optional[List[str]]
 
@@ -161,6 +162,7 @@ def _get_requiring_packages(current_dist: BaseDistribution) -> Iterator[str]:
             author=metadata.get("Author", ""),
             author_email=metadata.get("Author-email", ""),
             license=metadata.get("License", ""),
+            license_expression=metadata.get("License-Expression", ""),
             entry_points=entry_points,
             files=files,
         )
@@ -180,13 +182,18 @@ def print_results(
         if i > 0:
             write_output("---")
 
+        metadata_version_tuple = tuple(map(int, dist.metadata_version.split(".")))
+
         write_output("Name: %s", dist.name)
         write_output("Version: %s", dist.version)
         write_output("Summary: %s", dist.summary)
         write_output("Home-page: %s", dist.homepage)
         write_output("Author: %s", dist.author)
         write_output("Author-email: %s", dist.author_email)
-        write_output("License: %s", dist.license)
+        if metadata_version_tuple >= (2, 4) and dist.license_expression:
+            write_output("License-Expression: %s", dist.license_expression)
+        else:
+            write_output("License: %s", dist.license)
         write_output("Location: %s", dist.location)
         if dist.editable_project_location is not None:
             write_output(