PyEval_CallObjectWithKeywords() uses fast call

vstinner · vstinner · commit 3f745bf1d90a · 2016-08-19T16:42:42.000+02:00
Issue #27128: Modify PyEval_CallObjectWithKeywords() to use _PyObject_FastCall() when args==NULL and kw==NULL. It avoids the creation of a temporary empty tuple for positional arguments.
diff --git a/Python/ceval.c b/Python/ceval.c
@@ -4592,6 +4592,10 @@ PyEval_CallObjectWithKeywords(PyObject *func, PyObject *arg, PyObject *kw)
 #endif
 
     if (arg == NULL) {
+        if (kw == NULL) {
+            return _PyObject_FastCall(func, NULL, 0, 0);
+        }
+
         arg = PyTuple_New(0);
         if (arg == NULL)
             return NULL;
