M PyShell.py

M rpc.py
Improve exception handing if peer process has terminated.

Lib/idlelib/PyShell.py

@@ -400,7 +400,10 @@ class ModifiedInterpreter(InteractiveInterpreter):
             from signal import SIGINT
         except ImportError:
             SIGINT = 2
-        os.kill(self.rpcpid, SIGINT)
+        try:
+            os.kill(self.rpcpid, SIGINT)
+        except OSError:    # subprocess may have already exited
+            pass
 
     def __request_interrupt(self):
         self.rpcclt.asynccall("exec", "interrupt_the_server", (), {})

Lib/idlelib/rpc.py

@@ -166,6 +166,8 @@ class SocketIO:
             return ("OK", ret)
         except SystemExit:
             raise
+        except socket.error:
+            pass
         except:
             self.debug("localcall:EXCEPTION")
             traceback.print_exc(file=sys.__stderr__)