Rename json_metadata to metadata_dict

src/pip/_internal/metadata/_json.py

@@ -39,6 +39,8 @@ def json_name(field: str) -> str:
 
 
 def msg_to_json(msg: Message) -> Dict[str, Any]:
+    """Convert a Message object into a JSON-compatible dictionary."""
+
     def sanitise_header(h: Union[Header, str]) -> str:
         if isinstance(h, Header):
             chunks = []
@@ -67,6 +69,8 @@ def sanitise_header(h: Union[Header, str]) -> str:
         else:
             value = sanitise_header(msg.get(field))
             if key == "keywords":
+                # Accept both comma-separated and space-separated
+                # forms, for better compatibility with old data.
                 if "," in value:
                     value = [v.strip() for v in value.split(",")]
                 else:

src/pip/_internal/metadata/base.py

@@ -384,7 +384,7 @@ def metadata(self) -> email.message.Message:
         return self._metadata_cached()
 
     @property
-    def json_metadata(self) -> Dict[str, Any]:
+    def metadata_dict(self) -> Dict[str, Any]:
         """PEP 566 compliant JSON-serializable representation of METADATA or PKG-INFO.
 
         This should return an empty dict if the metadata file is unavailable.

tests/unit/metadata/test_metadata.py

@@ -90,15 +90,15 @@ class FakeDistribution(BaseDistribution):
     assert isinstance(direct_url.info, ArchiveInfo)
 
 
-def test_json_metadata(tmp_path: Path) -> None:
-    """Basic test of BaseDistribution json_metadata.
+def test_metadata_dict(tmp_path: Path) -> None:
+    """Basic test of BaseDistribution metadata_dict.
 
     More tests are available in the original pkg_metadata project where this
     function comes from, and which we may vendor in the future.
     """
     wheel_path = make_wheel(name="pkga", version="1.0.1").save_to_dir(tmp_path)
     wheel = FilesystemWheel(wheel_path)
     dist = get_wheel_distribution(wheel, "pkga")
-    json_metadata = dist.json_metadata
-    assert json_metadata["name"] == "pkga"
-    assert json_metadata["version"] == "1.0.1"
+    metadata_dict = dist.metadata_dict
+    assert metadata_dict["name"] == "pkga"
+    assert metadata_dict["version"] == "1.0.1"