From a2bfdd6900e9bd1f0ed4d3b24b3b6d5bce5e4ad1 Mon Sep 17 00:00:00 2001
From: Abdullah Masood <imabd645@gmail.com>
Date: Mon, 17 Aug 2026 17:46:14 +0500
Subject: [PATCH] gh-150942: Improve performance of csv reader by using
 _PyList_AppendTakeRef

---
 .../C_API/2026-08-17-17-46-00.gh-issue-150942.abcdef.rst     | 1 +
 Modules/_csv.c                                               | 5 ++---
 2 files changed, 3 insertions(+), 3 deletions(-)
 create mode 100644 Misc/NEWS.d/next/C_API/2026-08-17-17-46-00.gh-issue-150942.abcdef.rst

diff --git a/Misc/NEWS.d/next/C_API/2026-08-17-17-46-00.gh-issue-150942.abcdef.rst b/Misc/NEWS.d/next/C_API/2026-08-17-17-46-00.gh-issue-150942.abcdef.rst
new file mode 100644
index 000000000000000..7d060ebd375e3cf
--- /dev/null
+++ b/Misc/NEWS.d/next/C_API/2026-08-17-17-46-00.gh-issue-150942.abcdef.rst
@@ -0,0 +1 @@
+Improve performance of ``csv`` reader by using ``_PyList_AppendTakeRef`` internally.
diff --git a/Modules/_csv.c b/Modules/_csv.c
index a7fcc78e058f058..cddc09c3b23ee82 100644
--- a/Modules/_csv.c
+++ b/Modules/_csv.c
@@ -15,6 +15,7 @@ module instead.
 
 #include "Python.h"
 #include "pycore_pyatomic_ft_wrappers.h"
+#include "pycore_list.h"
 
 #include <stddef.h>               // offsetof()
 #include <stdbool.h>
@@ -685,11 +686,9 @@ parse_save_field(ReaderObj *self)
         }
         self->field_len = 0;
     }
-    if (PyList_Append(self->fields, field) < 0) {
-        Py_DECREF(field);
+    if (_PyList_AppendTakeRef((PyListObject *)self->fields, field) < 0) {
         return -1;
     }
-    Py_DECREF(field);
     return 0;
 }