diff --git a/Lib/idlelib/EditorWindow.py b/Lib/idlelib/EditorWindow.py
index e051348..7161069 100644
--- a/Lib/idlelib/EditorWindow.py
+++ b/Lib/idlelib/EditorWindow.py
@@ -654,7 +654,7 @@
             for item in menu[1]:
                 if item:
                     menuEventDict[menu[0]][prepstr(item[0])[1]] = item[1]
-        for menubarItem in self.menudict.keys():
+        for menubarItem in self.menudict:
             menu = self.menudict[menubarItem]
             end = menu.index(END) + 1
             for index in range(0, end):
@@ -733,7 +733,7 @@
         finally:
             rf_file.close()
         # for each edit window instance, construct the recent files menu
-        for instance in self.top.instance_dict.keys():
+        for instance in self.top.instance_dict:
             menu = instance.recent_files_menu
             menu.delete(1, END)  # clear, and rebuild:
             for i, file in zip(count(), rf_list):
@@ -863,7 +863,7 @@
         self.load_standard_extensions()
 
     def unload_extensions(self):
-        for ins in self.extensions.values():
+        for ins in list(self.extensions.values()):
             if hasattr(ins, "close"):
                 ins.close()
         self.extensions = {}
@@ -893,7 +893,7 @@
         self.extensions[name] = ins
         if keydefs:
             self.apply_bindings(keydefs)
-            for vevent in keydefs.keys():
+            for vevent in keydefs:
                 methodname = vevent.replace("-", "_")
                 while methodname[:1] == '<':
                     methodname = methodname[1:]