Merged revisions 86383 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/branches/py3k

........
  r86383 | antoine.pitrou | 2010-11-10 00:10:33 +0100 (mer., 10 nov. 2010) | 4 lines

  Issue #4471: Properly shutdown socket in IMAP.shutdown().  Patch by
  Lorenzo M. Catucci.
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diff --git a/Lib/imaplib.py b/Lib/imaplib.py
index 8734a84..c8f32a7 100644
--- a/Lib/imaplib.py
+++ b/Lib/imaplib.py
@@ -248,6 +248,7 @@
     def shutdown(self):
         """Close I/O established in "open"."""
         self.file.close()
+        self.sock.shutdown(socket.SHUT_RDWR)
         self.sock.close()