Issue #15319: Revert wrapping of sys.stdin. Patch by Serhiy Storchaka.

Lib/idlelib/NEWS.txt

 What's New in IDLE 2.7.4?
 =========================
 
-- Issue #13532: Check that arguments to sys.stdout.write are strings.
+- Issue #13532, #15319: Check that arguments to sys.stdout.write are strings.
 
 - Issue # 12510: Attempt to get certain tool tips no longer crashes IDLE.
 

Lib/idlelib/run.py

@@ -273,7 +273,7 @@ class MyHandler(rpc.RPCHandler):
         """Override base method"""
         executive = Executive(self)
         self.register("exec", executive)
-        sys.stdin = self.console = _RPCFile(self.get_remote_proxy("stdin"))
+        sys.stdin = self.console = self.get_remote_proxy("stdin")
         sys.stdout = _RPCFile(self.get_remote_proxy("stdout"))
         sys.stderr = _RPCFile(self.get_remote_proxy("stderr"))
         from idlelib import IOBinding