✨ HasNDim

Signed-off-by: nstarman <nstarman@users.noreply.github.com>

Author: nstarman

src/array_api_typing/__init__.py

@@ -6,6 +6,7 @@
     "HasDType",
     "HasDevice",
     "HasMatrixTranspose",
+    "HasNDim",
     "__version__",
     "__version_tuple__",
 )
@@ -16,5 +17,6 @@
     HasDevice,
     HasDType,
     HasMatrixTranspose,
+    HasNDim,
 )
 from ._version import version as __version__, version_tuple as __version_tuple__

src/array_api_typing/_array.py

@@ -4,6 +4,7 @@
     "HasDType",
     "HasDevice",
     "HasMatrixTranspose",
+    "HasNDim",
 )
 
 from types import ModuleType
@@ -100,6 +101,20 @@ def mT(self) -> Self:  # noqa: N802
         ...
 
 
+class HasNDim(Protocol):
+    """Protocol for array classes that have a number of dimensions attribute."""
+
+    @property
+    def ndim(self) -> int:
+        """Number of array dimensions (axes).
+
+        Returns:
+            int: number of array dimensions (axes).
+
+        """
+        ...
+
+
 class Array(
     # ------ Attributes -------
     HasDType[DTypeT_co],

tests/integration/test_numpy1p0.pyi

@@ -66,3 +66,7 @@ assert_type(x_i32.dtype, dtype[Any])
 # Check Attribute `.mT`
 assert_type(x_f32.mT, xpt.Array[dtype[Any]])
 assert_type(x_i32.mT, xpt.Array[dtype[Any]])
+
+# Check Attribute `.ndim`
+assert_type(x_f32.ndim, int)
+assert_type(x_i32.ndim, int)

tests/integration/test_numpy2p0.pyi

@@ -74,3 +74,8 @@ assert_type(x_b.dtype, np.dtype[B])
 assert_type(x_f32.mT, xpt.Array[np.dtype[F32]])
 assert_type(x_i32.mT, xpt.Array[np.dtype[I32]])
 assert_type(x_b.mT, xpt.Array[np.dtype[B]])
+
+# Check Attribute `.ndim`
+assert_type(x_f32.ndim, int)
+assert_type(x_i32.ndim, int)
+assert_type(x_b.ndim, int)