another fix for old-style imports in Py3.3: only try relative imports from within a package

--HG--
extra : transplant_source : %DF7%9D%BC%D2%07%B6%92v5N%7E%D2%3B%9AJ%95d_%B3

Cython/Compiler/ExprNodes.py

@@ -9450,19 +9450,21 @@ static PyObject *__Pyx_Import(PyObject *name, PyObject *from_list, long level) {
     {
         #if PY_VERSION_HEX >= 0x03030000
         if (level == -1) {
-            /* try relative import first */
-            PyObject *py_level = PyInt_FromLong(1);
-            if (!py_level)
-                goto bad;
-            module = PyObject_CallFunctionObjArgs(py_import,
-                name, global_dict, empty_dict, list, py_level, NULL);
-            Py_DECREF(py_level);
-            if (!module) {
-                if (!PyErr_ExceptionMatches(PyExc_ImportError))
+            if (strchr(__Pyx_MODULE_NAME, '.')) {
+                /* try package relative import first */
+                PyObject *py_level = PyInt_FromLong(1);
+                if (!py_level)
                     goto bad;
-                PyErr_Clear();
-                level = 0; /* try absolute import on failure */
+                module = PyObject_CallFunctionObjArgs(py_import,
+                    name, global_dict, empty_dict, list, py_level, NULL);
+                Py_DECREF(py_level);
+                if (!module) {
+                    if (!PyErr_ExceptionMatches(PyExc_ImportError))
+                        goto bad;
+                    PyErr_Clear();
+                }
             }
+            level = 0; /* try absolute import on failure */
         }
         #endif
         if (!module) {