From ae4bab71e3937aaa866d297862a4572e704ab880 Mon Sep 17 00:00:00 2001
From: Raymond Hettinger <python@rcn.com>
Date: Sun, 18 May 2014 21:02:25 +0100
Subject: Don't grow strings by concatenation.  Use ''.join() instead.

---
 Doc/howto/sockets.rst | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/Doc/howto/sockets.rst b/Doc/howto/sockets.rst
index 7a9b0ed..820beb5 100644
--- a/Doc/howto/sockets.rst
+++ b/Doc/howto/sockets.rst
@@ -204,13 +204,15 @@ length message::
                totalsent = totalsent + sent
 
        def myreceive(self):
-           msg = b''
-           while len(msg) < MSGLEN:
-               chunk = self.sock.recv(MSGLEN-len(msg))
+           chunks = []
+           bytes_recd = 0
+           while bytes_recd < MSGLEN:
+               chunk = self.sock.recv(min(MSGLEN - bytes_recd, 2048))
                if chunk == b'':
                    raise RuntimeError("socket connection broken")
-               msg = msg + chunk
-           return msg
+               chucks.append(chunk)
+               bytes_recd = bytes_recd + len(chunk)
+           return b''.join(chunks)
 
 The sending code here is usable for almost any messaging scheme - in Python you
 send strings, and you can use ``len()`` to determine its length (even if it has
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