Add copy() method for DiffractionObject

news/deepcopy.rst

@@ -0,0 +1,23 @@
+**Added:**
+
+* copy() method for DiffractionObject instance
+
+**Changed:**
+
+* <news item>
+
+**Deprecated:**
+
+* <news item>
+
+**Removed:**
+
+* <news item>
+
+**Fixed:**
+
+* <news item>
+
+**Security:**
+
+* <news item>

src/diffpy/utils/diffraction_objects.py

@@ -445,3 +445,14 @@ def dump(self, filepath, xtype=None):
                 f.write(f"{key} = {value}\n")
             f.write("\n#### start data\n")
             np.savetxt(f, data_to_save, delimiter=" ")
+
+    def copy(self):
+        """
+        Create a deep copy of the DiffractionObject instance.
+
+        Returns
+        -------
+        DiffractionObject
+            A new instance of DiffractionObject, which is a deep copy of the current instance.
+        """
+        return deepcopy(self)

tests/test_diffraction_objects.py

@@ -410,3 +410,16 @@ def test_all_array_setter():
         "Please use 'insert_scattering_quantity' to modify `all_arrays`.",
     ):
         actual_do.all_arrays = np.empty((4, 4))
+
+
+def test_copy_object():
+    do = DiffractionObject(
+        name="test",
+        wavelength=4.0 * np.pi,
+        xarray=np.array([0.0, 90.0, 180.0]),
+        yarray=np.array([1.0, 2.0, 3.0]),
+        xtype="tth",
+    )
+    do_copy = do.copy()
+    assert do == do_copy
+    assert id(do) != id(do_copy)