4 files changed, 55 insertions, 0 deletions
diff --git a/numpy/core/src/multiarray/methods.c b/numpy/core/src/multiarray/methods.c
index a791c2c22..cf298faa6 100644
--- a/numpy/core/src/multiarray/methods.c
+++ b/numpy/core/src/multiarray/methods.c
@@ -1901,6 +1901,16 @@ array_dumps(PyArrayObject *self, PyObject *args)
 
 
 static PyObject *
+array_sizeof(PyArrayObject *self, PyObject *args)
+{
+    if (!PyArg_ParseTuple(args, "")) {
+        return NULL;
+    }
+    return PyObject_GetAttrString(self, "nbytes");
+}
+
+
+static PyObject *
 array_transpose(PyArrayObject *self, PyObject *args)
 {
     PyObject *shape = Py_None;
@@ -2308,6 +2318,11 @@ NPY_NO_EXPORT PyMethodDef array_methods[] = {
         (PyCFunction)array_wraparray,
         METH_VARARGS, NULL},
 
+    /* for the sys module */
+    {"__sizeof__",
+        (PyCFunction) array_sizeof,
+        METH_VARARGS, NULL},
+
     /* for the copy module */
     {"__copy__",
         (PyCFunction)array_copy_keeporder,
diff --git a/numpy/core/src/multiarray/scalartypes.c.src b/numpy/core/src/multiarray/scalartypes.c.src
index 4fa634098..8a9569bdb 100644
--- a/numpy/core/src/multiarray/scalartypes.c.src
+++ b/numpy/core/src/multiarray/scalartypes.c.src
@@ -1921,6 +1921,11 @@ static PyMethodDef gentype_methods[] = {
         (PyCFunction)gentype_wraparray,
         METH_VARARGS, doc_sc_wraparray},
 
+    /* for the sys module */
+    {"__sizeof__",
+        (PyCFunction)gentype_itemsize_get,
+        METH_VARARGS, NULL},
+
     /* for the copy module */
     {"__copy__",
         (PyCFunction)gentype_copy,
diff --git a/numpy/core/tests/test_multiarray.py b/numpy/core/tests/test_multiarray.py
index 70398ee84..8eab5800e 100644
--- a/numpy/core/tests/test_multiarray.py
+++ b/numpy/core/tests/test_multiarray.py
@@ -4566,5 +4566,31 @@ class TestWhere(TestCase):
         assert_equal(np.where(False, b, a), "abcd")
 
 
+class TestSizeOf(TestCase):
+
+    def test_empty_array(self):
+        x = np.array([])
+        assert_equal(0, sys.getsizeof(x))
+
+    def check_array(self, dtype):
+        elem_size = sys.getsizeof(dtype(0))
+
+        for length in [10, 50, 100, 500]:
+            x = np.arange(length, dtype=dtype)
+            assert_equal(length * elem_size, sys.getsizeof(x))
+
+    def test_array_int32(self):
+        self.check_array(np.int32)
+
+    def test_array_int64(self):
+        self.check_array(np.int64)
+
+    def test_array_float32(self):
+        self.check_array(np.float32)
+
+    def test_array_float64(self):
+        self.check_array(np.float64)
+
+
 if __name__ == "__main__":
     run_module_suite()
diff --git a/numpy/core/tests/test_scalarmath.py b/numpy/core/tests/test_scalarmath.py
index afdc06c03..0e07e6cff 100644
--- a/numpy/core/tests/test_scalarmath.py
+++ b/numpy/core/tests/test_scalarmath.py
@@ -271,5 +271,14 @@ class TestRepr(object):
         for t in [np.float32, np.float64]:
             yield self._test_type_repr, t
 
+
+class TestSizeOf(TestCase):
+
+    def test_equal_nbytes(self):
+        for type in types:
+            x = type(0)
+            assert_equal(sys.getsizeof(x), x.nbytes)
+
+
 if __name__ == "__main__":
     run_module_suite()