fix: fix deprecation warning

Author: stevenhua0320

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>

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