Add implementation of dpnp.ndarray.tobytes method

CHANGELOG.md

@@ -21,7 +21,8 @@ Also, that release drops support for Python 3.9, making Python 3.10 the minimum
 * Added implementation of `dpnp.ndarray.tolist` method [#2652](https://github.com/IntelPython/dpnp/pull/2652)
 * Added implementation of `dpnp.frexp` [#2635](https://github.com/IntelPython/dpnp/pull/2635)
 * Added implementation of `dpnp.ndarray.tofile` method [#2635](https://github.com/IntelPython/dpnp/pull/2635)
-* Extended `pre-commit` configuration with `pyupgrade`, `actionlint`, and `gersemi` hooks  [#2658](https://github.com/IntelPython/dpnp/pull/2658)
+* 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)
 
 ### Changed
 

dpnp/dpnp_array.py

@@ -2011,7 +2011,42 @@ def to_device(self, device, /, *, stream=None):
         usm_res = self._array_obj.to_device(device, stream=stream)
         return dpnp_array._create_from_usm_ndarray(usm_res)
 
-    # 'tobytes',
+    def tobytes(self, order="C"):
+        r"""
+        Constructs Python bytes containing the raw data bytes in the array.
+
+        For full documentation refer to :obj:`numpy.ndarray.tobytes`.
+
+        Parameters
+        ----------
+        order : {None, "C", "F", "A", "K"}, optional
+            Controls the memory layout of the bytes object.
+
+            Default: ``"C"``.
+
+        Returns
+        -------
+        out : bytes
+            Python bytes exhibiting a copy of array's raw data.
+
+        See Also
+        --------
+        :obj:`dpnp.frombuffer` : Construct a 1D array from Python bytes.
+
+        Examples
+        --------
+        >>> import dpnp as np
+        >>> x = np.array([[0, 1], [2, 3]], dtype='i2')
+        >>> x.tobytes()
+        b'\x00\x00\x01\x00\x02\x00\x03\x00'
+        >>> x.tobytes("C") == x.tobytes()
+        True
+        >>> x.tobytes("F")
+        b'\x00\x00\x02\x00\x01\x00\x03\x00'
+
+        """
+
+        return self.asnumpy().tobytes(order=order)
 
     def tofile(self, fid, sep="", format=""):
         """

dpnp/dpnp_iface_arraycreation.py

@@ -1702,6 +1702,8 @@ def frombuffer(
     :obj:`dpnp.fromfile` : Construct array from data in a text or binary file.
     :obj:`dpnp.fromiter` : Construct array from an iterable object.
     :obj:`dpnp.fromstring` : Construct array from the text data in a string.
+    :obj:`ndarray.tobytes` : Construct Python bytes from the raw data bytes
+        in the array.
 
     Examples
     --------

dpnp/dpnp_iface_bitwise.py

@@ -110,7 +110,7 @@ def binary_repr(num, width=None):
 
     Examples
     --------
-    >>> import numpy as np
+    >>> import dpnp as np
     >>> np.binary_repr(3)
     '11'
     >>> np.binary_repr(-3)

dpnp/dpnp_iface_indexing.py

@@ -395,7 +395,7 @@ def compress(condition, a, axis=None, out=None):
 
     Examples
     --------
-    >>> import numpy as np
+    >>> import dpnp as np
     >>> a = np.array([[1, 2], [3, 4], [5, 6]])
     >>> a
     array([[1, 2],

dpnp/tests/test_ndarray.py

@@ -108,6 +108,18 @@ def test_strides(self):
         assert xp.full_like(a, fill_value=6) not in a
 
 
+class TestToBytes:
+    @pytest.mark.parametrize("order", ["C", "F", "K", "A", None])
+    def test_roundtrip_binary_str(self, order):
+        x = generate_random_numpy_array((2, 4, 3), dtype=complex)
+        x[0, :, 1] = [numpy.nan, numpy.inf, -numpy.inf, numpy.nan]
+        a = dpnp.array(x)
+
+        s = a.tobytes(order=order)
+        b = dpnp.frombuffer(s, dtype=a.dtype)
+        assert_array_equal(b, a.asnumpy().flatten(order))
+
+
 class TestToFile:
     def _create_data(self):
         x = generate_random_numpy_array((2, 4, 3), dtype=complex)

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

@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import unittest
 
 import numpy
@@ -42,7 +44,6 @@ def test_item(self):
     {"shape": (2, 3), "order": "C"},
     {"shape": (2, 3), "order": "F"},
 )
-@pytest.mark.skip("tobytes() method is not supported yet")
 class TestNdarrayToBytes(unittest.TestCase):
 
     @testing.for_all_dtypes()