Patch #1436130: codecs.lookup() now returns a CodecInfo object (a subclass

of tuple) that provides incremental decoders and encoders (a way to use
stateful codecs without the stream API). Functions
codecs.getincrementaldecoder() and codecs.getincrementalencoder() have
been added.

Lib/encodings/punycode.py

@@ -197,18 +197,27 @@ def punycode_decode(text, errors):
 ### Codec APIs
 
 class Codec(codecs.Codec):
-    def encode(self,input,errors='strict'):
 
+    def encode(self,input,errors='strict'):
         res = punycode_encode(input)
         return res, len(input)
 
     def decode(self,input,errors='strict'):
-
         if errors not in ('strict', 'replace', 'ignore'):
             raise UnicodeError, "Unsupported error handling "+errors
         res = punycode_decode(input, errors)
         return res, len(input)
 
+class IncrementalEncoder(codecs.IncrementalEncoder):
+    def encode(self, input, final=False):
+        return punycode_encode(input)
+
+class IncrementalDecoder(codecs.IncrementalDecoder):
+    def decode(self, input, final=False):
+        if errors not in ('strict', 'replace', 'ignore'):
+            raise UnicodeError, "Unsupported error handling "+errors
+        return punycode_decode(input, errors)
+
 class StreamWriter(Codec,codecs.StreamWriter):
     pass
 
@@ -218,5 +227,12 @@ class StreamReader(Codec,codecs.StreamReader):
 ### encodings module API
 
 def getregentry():
-
-    return (Codec().encode,Codec().decode,StreamReader,StreamWriter)
+    return codecs.CodecInfo(
+        name='punycode',
+        encode=Codec().encode,
+        decode=Codec().decode,
+        incrementalencoder=IncrementalEncoder,
+        incrementaldecoder=IncrementalDecoder,
+        streamwriter=StreamWriter,
+        streamreader=StreamReader,
+    )