Patch #1540892: site.py Quitter() class attempts to close sys.stdin
before raising SystemExit, allowing IDLE to honor quit() and exit().

M    Lib/site.py
M    Lib/idlelib/PyShell.py
M    Lib/idlelib/CREDITS.txt
M    Lib/idlelib/NEWS.txt
M    Misc/NEWS
diff --git a/Lib/idlelib/PyShell.py b/Lib/idlelib/PyShell.py
index 12a45a4..5790483 100644
--- a/Lib/idlelib/PyShell.py
+++ b/Lib/idlelib/PyShell.py
@@ -478,9 +478,6 @@
         import sys as _sys
         _sys.path = %r
         del _sys
-        _msg = 'Use File/Exit or your end-of-file key to quit IDLE'
-        __builtins__.quit = __builtins__.exit = _msg
-        del _msg
         \n""" % (sys.path,))
 
     active_seq = None
@@ -514,7 +511,10 @@
                 print >>sys.__stderr__, errmsg, what
                 print >>console, errmsg, what
             # we received a response to the currently active seq number:
-            self.tkconsole.endexecuting()
+            try:
+                self.tkconsole.endexecuting()
+            except AttributeError:  # shell may have closed
+                pass
         # Reschedule myself
         if not self.tkconsole.closing:
             self.tkconsole.text.after(self.tkconsole.pollinterval,
@@ -730,7 +730,10 @@
                     self.tkconsole.endexecuting()
         finally:
             if not use_subprocess:
-                self.tkconsole.endexecuting()
+                try:
+                    self.tkconsole.endexecuting()
+                except AttributeError:  # shell may have closed
+                    pass
 
     def write(self, s):
         "Override base class method"
@@ -804,9 +807,6 @@
         #
         OutputWindow.__init__(self, flist, None, None)
         #
-        import __builtin__
-        __builtin__.quit = __builtin__.exit = "To exit, type Ctrl-D."
-        #
 ##        self.config(usetabs=1, indentwidth=8, context_use_ps1=1)
         self.usetabs = True
         # indentwidth must be 8 when using tabs.  See note in EditorWindow: