pylock: add is_direct property

Author: sbidoul

src/pip/_internal/models/pylock.py

@@ -532,6 +532,10 @@ def from_dict(cls, d: Dict[str, Any]) -> "Self":
         )
         return package
 
+    @property
+    def is_direct(self) -> bool:
+        return not (self.sdist or self.wheels)
+
 
 @dataclass(frozen=True)
 class Pylock:

tests/unit/test_pylock.py

@@ -9,6 +9,8 @@
 from pip._vendor.packaging.version import Version
 
 from pip._internal.models.pylock import (
+    Package,
+    PackageDirectory,
     PackageWheel,
     Pylock,
     PylockRequiredKeyError,
@@ -290,3 +292,21 @@ def test_hash_validation(hashes: Dict[str, Any], expected_error: str) -> None:
             hashes=hashes,
         )
     assert str(exc_info.value) == expected_error
+
+
+def test_is_direct() -> None:
+    direct_package = Package(
+        name="example",
+        directory=PackageDirectory(path="."),
+    )
+    assert direct_package.is_direct
+    wheel_package = Package(
+        name="example",
+        wheels=[
+            PackageWheel(
+                url="https://example.com/example-1.0-py3-none-any.whl",
+                hashes={"sha256": "f" * 40},
+            )
+        ],
+    )
+    assert not wheel_package.is_direct