Add support for matrix multiplication. Fixes ionelmc#66.

Author: ionelmc

src/lazy_object_proxy/cext.c

@@ -248,6 +248,16 @@ static PyObject *Proxy_multiply(PyObject *o1, PyObject *o2)
 
 /* ------------------------------------------------------------------------- */
 
+static PyObject *Proxy_matrix_multiply(PyObject *o1, PyObject *o2)
+{
+    Proxy__WRAPPED_REPLACE_OR_RETURN_NULL(o1);
+    Proxy__WRAPPED_REPLACE_OR_RETURN_NULL(o2);
+
+    return PyNumber_MatrixMultiply(o1, o2);
+}
+
+/* ------------------------------------------------------------------------- */
+
 static PyObject *Proxy_remainder(PyObject *o1, PyObject *o2)
 {
     Proxy__WRAPPED_REPLACE_OR_RETURN_NULL(o1);
@@ -458,6 +468,28 @@ static PyObject *Proxy_inplace_multiply(
 
 /* ------------------------------------------------------------------------- */
 
+static PyObject *Proxy_inplace_matrix_multiply(
+        ProxyObject *self, PyObject *other)
+{
+    PyObject *object = NULL;
+
+    Proxy__ENSURE_WRAPPED_OR_RETURN_NULL(self);
+    Proxy__WRAPPED_REPLACE_OR_RETURN_NULL(other);
+
+    object = PyNumber_InPlaceMatrixMultiply(self->wrapped, other);
+
+    if (!object)
+        return NULL;
+
+    Py_DECREF(self->wrapped);
+    self->wrapped = object;
+
+    Py_INCREF(self);
+    return (PyObject *)self;
+}
+
+/* ------------------------------------------------------------------------- */
+
 static PyObject *Proxy_inplace_remainder(
         ProxyObject *self, PyObject *other)
 {
@@ -1239,6 +1271,8 @@ static PyNumberMethods Proxy_as_number = {
     (binaryfunc)Proxy_inplace_floor_divide, /*nb_inplace_floor_divide*/
     (binaryfunc)Proxy_inplace_true_divide,  /*nb_inplace_true_divide*/
     (unaryfunc)Proxy_index,                 /*nb_index*/
+    (binaryfunc)Proxy_matrix_multiply,      /*nb_matrix_multiply*/
+    (binaryfunc)Proxy_inplace_matrix_multiply,      /*nb_inplace_matrix_multiply*/
 };
 
 static PySequenceMethods Proxy_as_sequence = {

src/lazy_object_proxy/simple.py

@@ -141,6 +141,7 @@ def __delattr__(self, name):
     __add__ = make_proxy_method(operator.add)
     __sub__ = make_proxy_method(operator.sub)
     __mul__ = make_proxy_method(operator.mul)
+    __matmul__ = make_proxy_method(operator.matmul)
     __truediv__ = make_proxy_method(operator.truediv)
     __floordiv__ = make_proxy_method(operator.floordiv)
     __mod__ = make_proxy_method(operator.mod)
@@ -161,6 +162,9 @@ def __rsub__(self, other):
     def __rmul__(self, other):
         return other * self.__wrapped__
 
+    def __rmatmul__(self, other):
+        return other @ self.__wrapped__
+
     def __rdiv__(self, other):
         return operator.div(other, self.__wrapped__)
 
@@ -197,6 +201,7 @@ def __ror__(self, other):
     __iadd__ = make_proxy_method(operator.iadd)
     __isub__ = make_proxy_method(operator.isub)
     __imul__ = make_proxy_method(operator.imul)
+    __imatmul__ = make_proxy_method(operator.imatmul)
     __itruediv__ = make_proxy_method(operator.itruediv)
     __ifloordiv__ = make_proxy_method(operator.ifloordiv)
     __imod__ = make_proxy_method(operator.imod)

src/lazy_object_proxy/slots.py

@@ -226,6 +226,9 @@ def __sub__(self, other):
     def __mul__(self, other):
         return self.__wrapped__ * other
 
+    def __matmul__(self, other):
+        return self.__wrapped__ @ other
+
     def __truediv__(self, other):
         return operator.truediv(self.__wrapped__, other)
 
@@ -265,6 +268,9 @@ def __rsub__(self, other):
     def __rmul__(self, other):
         return other * self.__wrapped__
 
+    def __rmatmul__(self, other):
+        return other @ self.__wrapped__
+
     def __rdiv__(self, other):
         return operator.div(other, self.__wrapped__)
 
@@ -310,8 +316,8 @@ def __imul__(self, other):
         self.__wrapped__ *= other
         return self
 
-    def __idiv__(self, other):
-        self.__wrapped__ = operator.idiv(self.__wrapped__, other)
+    def __imatmul__(self, other):
+        self.__wrapped__ @= other
         return self
 
     def __itruediv__(self, other):

tests/test_lazy_object_proxy.py

@@ -912,6 +912,26 @@ def test_mul(lop):
     assert two * 3 == 2 * 3
 
 
+def test_matmul(lop):
+    import numpy
+
+    one = numpy.array((1, 2, 3))
+    two = numpy.array((2, 3, 4))
+    assert one @ two == 20
+
+    one = lop.Proxy(lambda: numpy.array((1, 2, 3)))
+    two = lop.Proxy(lambda: numpy.array((2, 3, 4)))
+    assert one @ two == 20
+
+    one = lop.Proxy(lambda: numpy.array((1, 2, 3)))
+    two = numpy.array((2, 3, 4))
+    assert one @ two == 20
+
+    one = numpy.array((1, 2, 3))
+    two = lop.Proxy(lambda: numpy.array((2, 3, 4)))
+    assert one @ two == 20
+
+
 def test_div(lop):
     # On Python 2 this will pick up div and on Python
     # 3 it will pick up truediv.
@@ -1067,6 +1087,27 @@ def test_imul(lop):
         assert type(value) == lop.Proxy
 
 
+def test_imatmul(lop):
+    class InplaceMatmul:
+        value = None
+
+        def __imatmul__(self, other):
+            self.value = other
+            return self
+
+    value = InplaceMatmul()
+    assert value.value is None
+    value @= 123
+    assert value.value == 123
+
+    value = lop.Proxy(InplaceMatmul)
+    value @= 234
+    assert value.value == 234
+
+    if lop.kind != 'simple':
+        assert type(value) == lop.Proxy
+
+
 def test_idiv(lop):
     # On Python 2 this will pick up div and on Python
     # 3 it will pick up truediv.

tox.ini

@@ -42,6 +42,7 @@ deps =
     pytest
     pytest-benchmark
     Django
+    numpy
     objproxies==0.9.4
     hunter
     cover: pytest-cov