Issue #27310: Fix IDLE.app failure to launch on OS X due to vestigial import.

diff --cc Mac/IDLE/IDLE.app/Contents/Resources/idlemain.py
index 5e9305a9d52d444b5f35432cb1269b3fcf3926f7,986760d314b5858cde34df897b0d5d68b9a0db01..5994c18ff876b38a95230a3e0df7be337f01332d
--- 1/Mac/IDLE/IDLE.app/Contents/Resources/idlemain.py
--- 2/Mac/IDLE/IDLE.app/Contents/Resources/idlemain.py
+++ b/Mac/IDLE/IDLE.app/Contents/Resources/idlemain.py
@@@ -68,8 -68,6 +68,6 @@@ for idx, value in enumerate(sys.argv)
          break
  
  # Now it is safe to import idlelib.
- from idlelib import macosxSupport
- macosxSupport._appbundle = True
 -from idlelib.PyShell import main
 +from idlelib.pyshell import main
  if __name__ == '__main__':
      main()

diff --cc Misc/NEWS
index 005954f1900bd81b0dd15478e08706865519402e,1e06ea8895c6dee7d5409b644b37565c2f7af846..7493570057f2cf46ec148eb9dff6cee4878dd47b
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -2,10 -2,22 +2,21 @@@
  Python News
  +++++++++++
  
 -What's New in Python 3.5.3 release candidate 1?
 -===============================================
++What's New in Python 3.6.0 alpha 3
++==================================
+ 
 -Release date: TBA
++*Release date: XXXX-XX-XX*
+ 
 -Core and Builtins
 ------------------
++IDLE
++++++
+ 
 -Library
 --------
++- Issue #27310: Fix IDLE.app failure to launch on OS X due to vestigial import.
+ 
+ 
 -What's New in Python 3.5.2 final?
 -=================================
 +What's New in Python 3.6.0 alpha 2
 +==================================
  
 -Release date: 2016-06-26
 +*Release date: XXXX-XX-XX*
  
  Core and Builtins
  -----------------