Add next() and __iter__() methods to StreamReader, StreamReaderWriter

and StreamRecoder.

This closes SF bug #634246.

Lib/codecs.py

@@ -299,6 +299,17 @@ def reset(self):
         """
         pass
 
+    def next(self):
+
+        """ Return the next decoded line from the input stream."""
+        line = self.readline()
+        if line:
+            return line
+        raise StopIteration
+
+    def __iter__(self):
+        return self
+
     def __getattr__(self, name,
                     getattr=getattr):
 
@@ -351,6 +362,14 @@ def readlines(self, sizehint=None):
 
         return self.reader.readlines(sizehint)
 
+    def next(self):
+
+        """ Return the next decoded line from the input stream."""
+        return self.reader.next()
+
+    def __iter__(self):
+        return self
+
     def write(self, data):
 
         return self.writer.write(data)
@@ -451,6 +470,14 @@ def readlines(self, sizehint=None):
         data, bytesencoded = self.encode(data, self.errors)
         return data.splitlines(1)
 
+    def next(self):
+
+        """ Return the next decoded line from the input stream."""
+        return self.reader.next()
+
+    def __iter__(self):
+        return self
+
     def write(self, data):
 
         data, bytesdecoded = self.decode(data, self.errors)

Misc/NEWS

@@ -362,6 +362,9 @@ Extension modules
 Library
 -------
 
+- StreamReader, StreamReaderWriter and StreamRecoder in the codecs
+  modules are iterators now.
+
 - gzip.py now handles files exceeding 2GB.  Files over 4GB also work
   now (provided the OS supports it, and Python is configured with large
   file support), but in that case the underlying gzip file format can