gh-134706: Return bytes written from codecs.Stream(Reader)Writer.write()

Doc/library/codecs.rst

@@ -747,6 +747,9 @@ compatible with the Python codec registry.
 
       Writes the object's contents encoded to the stream.
 
+      .. versionchanged:: next
+         Returns the number of characters or bytes written to the stream.
+
 
    .. method:: writelines(list)
 

Lib/codecs.py

@@ -378,7 +378,7 @@ def write(self, object):
         """ Writes the object's contents encoded to self.stream.
         """
         data, consumed = self.encode(object, self.errors)
-        self.stream.write(data)
+        return self.stream.write(data)
 
     def writelines(self, list):
 

Misc/NEWS.d/next/Library/2025-05-26-12-44-40.gh-issue-134706.bcTycR.rst

@@ -0,0 +1,3 @@
+:meth:`codecs.StreamWriter.write` and
+``codecs.StreamReaderWriter.write`` now return the number of characters
+or bytes written.