Sockets facelift. APIs that could return binary data (e.g. aton() and

recv()) now return bytes, not str or str8.  The socket.py code is
redone; it now subclasses _socket.socket and instead of having its own
_fileobject for makefile(), it uses io.SocketIO.  Some stuff in io.py
was moved around to make this work.  (I really need to rethink my
policy regarding readline() and read(-1) on raw files; and readline()
on buffered files ought to use peeking().  Later.)

Lib/urllib2.py

@@ -1085,10 +1085,8 @@ class AbstractHTTPHandler(BaseHandler):
         # to read().  This weird wrapping allows the returned object to
         # have readline() and readlines() methods.
 
-        # XXX It might be better to extract the read buffering code
-        # out of socket._fileobject() and into a base class.
-
         r.recv = r.read
+        # XXX socket._fileobject is gone; use some class from io.py instead
         fp = socket._fileobject(r, close=True)
 
         resp = addinfourl(fp, r.msg, req.get_full_url())