diff -r 4e1e68069480 Lib/idlelib/OutputWindow.py
--- a/Lib/idlelib/OutputWindow.py	Sat Oct 18 17:10:32 2014 -0400
+++ b/Lib/idlelib/OutputWindow.py	Sun Oct 19 13:46:04 2014 +0300
@@ -39,7 +39,7 @@ class OutputWindow(EditorWindow):
             s = s.decode(IOBinding.encoding, "replace")
         self.text.insert(mark, s, tags)
         self.text.see(mark)
-        self.text.update()
+        self.text.update_idletasks()
         return len(s)
 
     def writelines(self, lines):
diff -r 4e1e68069480 Lib/idlelib/PyShell.py
--- a/Lib/idlelib/PyShell.py	Sat Oct 18 17:10:32 2014 -0400
+++ b/Lib/idlelib/PyShell.py	Sun Oct 19 13:46:04 2014 +0300
@@ -1,5 +1,7 @@
 #! /usr/bin/env python3
 
+import codecs
+import functools
 import getopt
 import os
 import os.path
@@ -383,6 +385,15 @@ class MyRPCClient(rpc.RPCClient):
         raise EOFError
 
 
+def outputhandler(output, decoder, inputfd, mask):
+    data = os.read(inputfd, 512)
+    s = decoder.decode(data)
+    try:
+        output.write(s)
+    except UnicodeEncodeError:
+        s = re.sub('[^\x00-\uffff]', lambda m: r'\U%08x' % ord(m.group()), s)
+        output.write(s)
+
 class ModifiedInterpreter(InteractiveInterpreter):
 
     def __init__(self, tkconsole):
@@ -402,7 +413,23 @@ class ModifiedInterpreter(InteractiveInt
     def spawn_subprocess(self):
         if self.subprocess_arglist is None:
             self.subprocess_arglist = self.build_subprocess_arglist()
-        self.rpcsubproc = subprocess.Popen(self.subprocess_arglist)
+        self.rpcsubproc = subprocess.Popen(self.subprocess_arglist,
+                                           stdin=subprocess.DEVNULL,
+                                           stdout=subprocess.PIPE,
+                                           stderr=subprocess.PIPE)
+        decoder = codecs.getincrementaldecoder(sys.getfilesystemencoding())
+        self.tkconsole.root.createfilehandler(
+            self.rpcsubproc.stdout.fileno(),
+            READABLE,
+            functools.partial(outputhandler,
+                              self.tkconsole.stdout,
+                              decoder('surrogateescape')))
+        self.tkconsole.root.createfilehandler(
+            self.rpcsubproc.stderr.fileno(),
+            READABLE,
+            functools.partial(outputhandler,
+                              self.tkconsole.stderr,
+                              decoder('surrogateescape')))
 
     def build_subprocess_arglist(self):
         assert (self.port!=0), (
@@ -535,12 +562,14 @@ class ModifiedInterpreter(InteractiveInt
             self.rpcsubproc.kill()
         except OSError:
             # process already terminated
-            return
+            pass
         else:
             try:
                 self.rpcsubproc.wait()
             except OSError:
-                return
+                pass
+        self.rpcsubproc.stdout.close()
+        self.rpcsubproc.stderr.close()
 
     def transfer_path(self, with_cwd=False):
         if with_cwd:        # Issue 13506