From 50380f50fee6ff633b043e180745a3f51d0b426a Mon Sep 17 00:00:00 2001
From: stevenhua0320 <r.hua@mail.utoronto.ca>
Date: Tue, 17 Feb 2026 14:53:11 -0500
Subject: [PATCH] fix: fix deprecation warning

---
 news/fix-deprecation.rst          | 23 +++++++++++++++++++++++
 src/diffpy/structure/structure.py |  3 +--
 2 files changed, 24 insertions(+), 2 deletions(-)
 create mode 100644 news/fix-deprecation.rst

diff --git a/news/fix-deprecation.rst b/news/fix-deprecation.rst
new file mode 100644
index 0000000..5be8370
--- /dev/null
+++ b/news/fix-deprecation.rst
@@ -0,0 +1,23 @@
+**Added:**
+
+* <news item>
+
+**Changed:**
+
+* <news item>
+
+**Deprecated:**
+
+* <news item>
+
+**Removed:**
+
+* <news item>
+
+**Fixed:**
+
+* Fix deprecation for open file for Python 3.14
+
+**Security:**
+
+* <news item>
diff --git a/src/diffpy/structure/structure.py b/src/diffpy/structure/structure.py
index 012c167..3c7b725 100644
--- a/src/diffpy/structure/structure.py
+++ b/src/diffpy/structure/structure.py
@@ -14,7 +14,6 @@
 ##############################################################################
 """This module defines class `Structure`."""
 
-import codecs
 import copy as copymod
 
 import numpy
@@ -347,7 +346,7 @@ def write(self, filename, format):
         p = getParser(format)
         p.filename = filename
         s = p.tostring(self)
-        with codecs.open(filename, "w", encoding="UTF-8") as fp:
+        with open(filename, "w", encoding="utf-8", newline="") as fp:
             fp.write(s)
         return