From 5a27168883523adba65b33482f4872d2e5d2e5f9 Mon Sep 17 00:00:00 2001
From: Benjamin Peterson <benjamin@python.org>
Date: Sat, 11 May 2013 22:24:28 -0500
Subject: prevent IDLE from trying to close when sys.stdin is reassigned
 (#17838)

---
 Lib/idlelib/run.py | 5 +++++
 Misc/NEWS          | 2 ++
 2 files changed, 7 insertions(+)

diff --git a/Lib/idlelib/run.py b/Lib/idlelib/run.py
index e82ebf4c..9cc009f 100644
--- a/Lib/idlelib/run.py
+++ b/Lib/idlelib/run.py
@@ -264,6 +264,11 @@ class MyHandler(rpc.RPCHandler):
                 IOBinding.encoding)
         sys.stderr = PyShell.PseudoOutputFile(self.console, "stderr",
                 IOBinding.encoding)
+
+        # Keep a reference to stdin so that it won't try to exit IDLE if
+        # sys.stdin gets changed from within IDLE's shell. See issue17838.
+        self._keep_stdin = sys.stdin
+
         self.interp = self.get_remote_proxy("interp")
         rpc.RPCHandler.getresponse(self, myseq=None, wait=0.05)
 
diff --git a/Misc/NEWS b/Misc/NEWS
index 624a8af..0405fb9 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -122,6 +122,8 @@ Tests
 IDLE
 ----
 
+- Issue #17838: Allow sys.stdin to be reassigned.
+
 - Issue #14735: Update IDLE docs to omit "Control-z on Windows".
 
 - Issue #17585: Fixed IDLE regression. Now closes when using exit() or quit().
-- 
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