implement PyNumber_Divmod to fix datetime.timedelta(0)

src/capi/abstract.cpp

@@ -1132,8 +1132,12 @@ extern "C" PyObject* PyNumber_Remainder(PyObject* lhs, PyObject* rhs) noexcept {
     }
 }
 
-extern "C" PyObject* PyNumber_Divmod(PyObject*, PyObject*) noexcept {
-    Py_FatalError("unimplemented");
+extern "C" PyObject* PyNumber_Divmod(PyObject* lhs, PyObject* rhs) noexcept {
+    try {
+        return binop(lhs, rhs, AST_TYPE::DivMod);
+    } catch (ExcInfo e) {
+        Py_FatalError("unimplemented");
+    }
 }
 
 extern "C" PyObject* PyNumber_Power(PyObject*, PyObject*, PyObject* o3) noexcept {

test/tests/datetime_test.py

@@ -5,3 +5,4 @@ import datetime
 print repr(datetime.time())
 print datetime.datetime.__base__
 print repr(datetime.datetime(1, 2, 3))
+print str(datetime.timedelta(0))