Dec 16, 2025 · Dec 16, 2025 · Dec 16, 2025
diff --git a/numpy/ma/mrecords.py b/numpy/ma/mrecords.py
            try:
                if issubclass(dtype, np.ndarray):
                    output = np.ndarray.view(self, dtype)
                    dtype = None
                else:
                    output = np.ndarray.view(self, dtype)
            # OK, there's the change
diff --git a/numpy/ma/tests/test_mrecords.py b/numpy/ma/tests/test_mrecords.py
        assert_equal(test.dtype, np.dtype(alttype))
        assert_(test._fill_value is None)

    def test_view_ndarray_subclass_resets_dtype(self):
        x = fromarrays([[1, 2, 3], [10, 20, 30]], names="a,b")
        x["a"][1] = ma.masked

        class MySub(np.ndarray):
            pass

        y = x.view(MySub)
        assert_(isinstance(y, MySub))
        assert_equal(y.dtype, x.dtype)
        assert_equal(y._mask.shape, y.shape)

 ##############################################################################
 class TestMRecordsImport:
Original file line number	Diff line number	Diff line change
Expand Up		@@ -364,6 +364,7 @@ def view(self, dtype=None, type=None):
		try:
		if issubclass(dtype, np.ndarray):
		output = np.ndarray.view(self, dtype)
		dtype = None
		else:
		output = np.ndarray.view(self, dtype)
		# OK, there's the change
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Original file line number	Diff line number	Diff line change
Expand Up		@@ -384,6 +384,17 @@ def test_view_flexible_type(self):
		assert_equal(test.dtype, np.dtype(alttype))
		assert_(test._fill_value is None)

		def test_view_ndarray_subclass_resets_dtype(self):
		x = fromarrays([[1, 2, 3], [10, 20, 30]], names="a,b")
		x["a"][1] = ma.masked

		class MySub(np.ndarray):
		pass

		y = x.view(MySub)
		assert_(isinstance(y, MySub))
		assert_equal(y.dtype, x.dtype)
		assert_equal(y._mask.shape, y.shape)

		##############################################################################
		class TestMRecordsImport:
Expand Down