Avoid problem resolving 'localhost'

M PyShell.py
M rpc.py
M run.py
diff --git a/Lib/idlelib/PyShell.py b/Lib/idlelib/PyShell.py
index db4a05b..e556af3 100644
--- a/Lib/idlelib/PyShell.py
+++ b/Lib/idlelib/PyShell.py
@@ -35,6 +35,7 @@
 import RemoteDebugger
 
 IDENTCHARS = string.ascii_letters + string.digits + "_"
+LOCALHOST = '127.0.0.1'
 
 try:
     from signal import SIGTERM
@@ -336,7 +337,7 @@
         return [sys.executable] + w + ["-c", command, str(self.port)]
 
     def start_subprocess(self):
-        addr = ("localhost", self.port)
+        addr = (LOCALHOST, self.port)
         # Idle starts listening for connection on localhost
         for i in range(3):
             time.sleep(i)