Use identifier API for PyObject_GetAttrString.
diff --git a/Modules/_csv.c b/Modules/_csv.c
index 1334633..59c74e7 100644
--- a/Modules/_csv.c
+++ b/Modules/_csv.c
@@ -1317,6 +1317,7 @@
 {
     PyObject * output_file, * dialect = NULL;
     WriterObj * self = PyObject_GC_New(WriterObj, &Writer_Type);
+    _Py_identifier(write);
 
     if (!self)
         return NULL;
@@ -1333,7 +1334,7 @@
         Py_DECREF(self);
         return NULL;
     }
-    self->writeline = PyObject_GetAttrString(output_file, "write");
+    self->writeline = _PyObject_GetAttrId(output_file, &PyId_write);
     if (self->writeline == NULL || !PyCallable_Check(self->writeline)) {
         PyErr_SetString(PyExc_TypeError,
                         "argument 1 must have a \"write\" method");