Issue #17838: merge with 3.3

diff --cc Lib/idlelib/run.py
Simple merge

diff --cc Misc/NEWS
index 22e038b51e976f5180b972c8558be8f506a34827,c76a852f0504212ec91a0fcc8256babb66348441..4c88a540647af2df5dcc24cea161c7c7db8d4679
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -283,28 -181,26 +283,30 @@@ Test
  - Issue #6696: add documentation for the Profile objects, and improve
    profile/cProfile docs.  Patch by Tom Pinckney.
  
 +C-API
 +-----
  
 -What's New in Python 3.3.1?
 -===========================
 -
 -*Release date: 07-Apr-2013*
 +- Issue #17522: Add the PyGILState_Check() API.
  
 -Build
 ------
 +- Issue #17327: Add PyDict_SetDefault.
  
 -- Issue #17550: Fix the --enable-profiling configure switch.
  
  IDLE
 --------
 +----
  
 -- Issue #17625: In IDLE, close the replace dialog after it is used.
++- Issue #17838: Allow sys.stdin to be reassigned.
++
 +- Issue #13495: Avoid loading the color delegator twice in IDLE.
 +
 +- Issue #17798: Allow IDLE to edit new files when specified on command line.
 +
 +- Issue #14735: Update IDLE docs to omit "Control-z on Windows".
 +
 +Build
 +-----
 +
 +- Issue #17547: In configure, explicitly pass -Wformat for the benefit for GCC
 +  4.8.
  
  
  What's New in Python 3.3.1 release candidate 1?