Tweak message

Author: bhrutledge

tests/test_package.py

@@ -374,8 +374,7 @@ def test_pkginfo_returns_no_metadata(read_data, missing_fields, monkeypatch):
         package_file.PackageFile.from_filename(filename, comment=None)
 
     assert (
-        f"Distribution metadata is missing required fields: {missing_fields}."
-        in err.value.args[0]
+        f"Metadata is missing required fields: {missing_fields}." in err.value.args[0]
     )
     assert "1.0, 1.1, 1.2, 2.0, 2.1, 2.2" in err.value.args[0]
 

twine/package.py

@@ -111,10 +111,10 @@ def from_filename(cls, filename: str, comment: Optional[str]) -> "PackageFile":
         if missing_fields:
             supported_metadata = list(pkginfo.distribution.HEADER_ATTRS)
             raise exceptions.InvalidDistribution(
-                "Distribution metadata is missing required fields: "
-                f"{', '.join(missing_fields)}. "
-                "Make sure that the distribution includes the files where those fields "
-                "are specified, and that you're using a supported Metadata-Version: "
+                "Metadata is missing required fields: "
+                f"{', '.join(missing_fields)}.\n"
+                "Make sure the distribution includes the files where those fields "
+                "are specified, and is using a supported Metadata-Version: "
                 f"{', '.join(supported_metadata)}."
             )