diff -r af602a891892 Lib/idlelib/filelist.py
--- a/Lib/idlelib/filelist.py	Sat Jul 16 18:27:11 2016 -0400
+++ b/Lib/idlelib/filelist.py	Fri Jul 22 04:16:01 2016 -0400
@@ -65,7 +65,10 @@
             del self.dict[key]
         del self.inversedict[edit]
         if not self.inversedict:
-            self.root.quit()
+            #self.root.quit()
+            # import here to avoid circular import problem
+            from idlelib.pyshell import loop
+            loop.stop()

     def filename_changed_edit(self, edit):
         edit.saved_change_hook()
diff -r af602a891892 Lib/idlelib/pyshell.py
--- a/Lib/idlelib/pyshell.py	Sat Jul 16 18:27:11 2016 -0400
+++ b/Lib/idlelib/pyshell.py	Fri Jul 22 04:16:01 2016 -0400
@@ -15,6 +15,9 @@
             parent=root)
     sys.exit(1)

+import asyncio
+loop = asyncio.get_event_loop()
+
 import getopt
 import os
 import os.path
@@ -1524,9 +1527,17 @@
         if tkversionwarning:
             shell.interp.runcommand("print('%s')" % tkversionwarning)

+    # #Experiment with running IDLE with asyncio loop
+    def tk_update():
+        root.update()
+        loop.call_later(.01, tk_update)
+
     while flist.inversedict:  # keep IDLE running while files are open.
-        root.mainloop()
+        tk_update()
+        loop.run_forever()
+        #root.mainloop()
     root.destroy()
+    loop.close()
     capture_warnings(False)

 if __name__ == "__main__":