Add dpnp.ndarray.__bytes__ method (#2671)

The PR implements a special python method `__bytes__` for
`dpnp.ndarray`.

Author: antonwolfy

CHANGELOG.md

@@ -24,6 +24,7 @@ Also, that release drops support for Python 3.9, making Python 3.10 the minimum
 * Extended `pre-commit` configuration with `pyupgrade`, `actionlint`, and `gersemi` hooks [#2658](https://github.com/IntelPython/dpnp/pull/2658)
 * Added implementation of `dpnp.ndarray.tobytes` method [#2656](https://github.com/IntelPython/dpnp/pull/2656)
 * Added implementation of `dpnp.ndarray.__format__` method [#2662](https://github.com/IntelPython/dpnp/pull/2662)
+* Added implementation of `dpnp.ndarray.__bytes__` method [#2671](https://github.com/IntelPython/dpnp/pull/2671)
 
 ### Changed
 

doc/reference/ndarray.rst

@@ -436,6 +436,7 @@ and return the appropriate scalar.
    :toctree: generated/
    :nosignatures:
 
+   ndarray.__bytes__
    ndarray.__index__
    ndarray.__int__
    ndarray.__float__

dpnp/dpnp_array.py

@@ -185,6 +185,10 @@ def __bool__(self, /):
         """``True`` if `self` else ``False``."""
         return self._array_obj.__bool__()
 
+    def __bytes__(self):
+        r"""Return :math:`\text{bytes(self)}`."""
+        return bytes(self.asnumpy())
+
     # '__class__',
     # `__class_getitem__`,
 

dpnp/tests/third_party/cupy/core_tests/test_ndarray.py

@@ -653,32 +653,28 @@ def test_size_zero_dim_array_with_axis(self):
 
 class TestPythonInterface(unittest.TestCase):
 
-    @pytest.mark.skip("__bytes__ is not supported")
     @testing.for_all_dtypes()
     @testing.numpy_cupy_equal()
     def test_bytes_tobytes(self, xp, dtype):
         x = testing.shaped_arange((3, 4, 5), xp, dtype)
         return bytes(x)
 
-    @pytest.mark.skip("__bytes__ is not supported")
     @testing.for_all_dtypes()
     @testing.numpy_cupy_equal()
     def test_bytes_tobytes_empty(self, xp, dtype):
-        x = xp.empty((0,), dtype)
+        x = xp.empty((0,), dtype=dtype)
         return bytes(x)
 
-    @pytest.mark.skip("__bytes__ is not supported")
     @testing.for_all_dtypes()
     @testing.numpy_cupy_equal()
     def test_bytes_tobytes_empty2(self, xp, dtype):
-        x = xp.empty((3, 0, 4), dtype)
+        x = xp.empty((3, 0, 4), dtype=dtype)
         return bytes(x)
 
     # The result of bytes(numpy.array(scalar)) is the same as bytes(scalar)
     # if scalar is of an integer dtype including bool_. It's spec is
     # bytes(int): bytes object of size given by the parameter initialized with
     # null bytes.
-    @pytest.mark.skip("__bytes__ is not supported")
     @testing.for_float_dtypes()
     @testing.numpy_cupy_equal()
     def test_bytes_tobytes_scalar_array(self, xp, dtype):