diff --git a/Lib/idlelib/EditorWindow.py b/Lib/idlelib/EditorWindow.py
index 6b8ab63..dccd3ff 100644
--- a/Lib/idlelib/EditorWindow.py
+++ b/Lib/idlelib/EditorWindow.py
@@ -648,8 +648,8 @@
                     if accel:
                         itemName = menu.entrycget(index, 'label')
                         event = ''
-                        if menuEventDict.has_key(menubarItem):
-                            if menuEventDict[menubarItem].has_key(itemName):
+                        if menubarItem in menuEventDict:
+                            if itemName in menuEventDict[menubarItem]:
                                 event = menuEventDict[menubarItem][itemName]
                         if event:
                             accel = get_accelerator(keydefs, event)
diff --git a/Lib/idlelib/FileList.py b/Lib/idlelib/FileList.py
index 4b57901..2ef0640 100644
--- a/Lib/idlelib/FileList.py
+++ b/Lib/idlelib/FileList.py
@@ -25,7 +25,7 @@
                 master=self.root)
             return None
         key = os.path.normcase(filename)
-        if self.dict.has_key(key):
+        if key in self.dict:
             edit = self.dict[key]
             edit.top.wakeup()
             return edit
@@ -79,7 +79,7 @@
         newkey = os.path.normcase(filename)
         if newkey == key:
             return
-        if self.dict.has_key(newkey):
+        if newkey in self.dict:
             conflict = self.dict[newkey]
             self.inversedict[conflict] = None
             tkMessageBox.showerror(
diff --git a/Lib/idlelib/MultiCall.py b/Lib/idlelib/MultiCall.py
index 1c6103a..40db92d 100644
--- a/Lib/idlelib/MultiCall.py
+++ b/Lib/idlelib/MultiCall.py
@@ -187,7 +187,7 @@
                                                           seq, handler)))
 
     def bind(self, triplet, func):
-        if not self.bindedfuncs.has_key(triplet[2]):
+        if triplet[2] not in self.bindedfuncs:
             self.bindedfuncs[triplet[2]] = [[] for s in _states]
             for s in _states:
                 lists = [ self.bindedfuncs[detail][i]
diff --git a/Lib/idlelib/MultiStatusBar.py b/Lib/idlelib/MultiStatusBar.py
index 2d4c547..8ee2d03 100644
--- a/Lib/idlelib/MultiStatusBar.py
+++ b/Lib/idlelib/MultiStatusBar.py
@@ -9,7 +9,7 @@
         self.labels = {}
 
     def set_label(self, name, text='', side=LEFT):
-        if not self.labels.has_key(name):
+        if name not in self.labels:
             label = Label(self, bd=1, relief=SUNKEN, anchor=W)
             label.pack(side=side)
             self.labels[name] = label
diff --git a/Lib/idlelib/ObjectBrowser.py b/Lib/idlelib/ObjectBrowser.py
index a2a6cee..b4f64b6 100644
--- a/Lib/idlelib/ObjectBrowser.py
+++ b/Lib/idlelib/ObjectBrowser.py
@@ -126,7 +126,7 @@
 
 def make_objecttreeitem(labeltext, object, setfunction=None):
     t = type(object)
-    if dispatch.has_key(t):
+    if t in dispatch:
         c = dispatch[t]
     else:
         c = ObjectTreeItem
diff --git a/Lib/idlelib/PathBrowser.py b/Lib/idlelib/PathBrowser.py
index 86cd270..8c73587 100644
--- a/Lib/idlelib/PathBrowser.py
+++ b/Lib/idlelib/PathBrowser.py
@@ -78,7 +78,7 @@
                 normed_name = os.path.normcase(name)
                 if normed_name[i:] == suff:
                     mod_name = name[:i]
-                    if not modules.has_key(mod_name):
+                    if mod_name not in modules:
                         modules[mod_name] = None
                         sorted.append((normed_name, name))
                         allnames.remove(name)
diff --git a/Lib/idlelib/RemoteDebugger.py b/Lib/idlelib/RemoteDebugger.py
index 74085c3..0422cce 100644
--- a/Lib/idlelib/RemoteDebugger.py
+++ b/Lib/idlelib/RemoteDebugger.py
@@ -231,7 +231,7 @@
         return self._get_dict_proxy(did)
 
     def _get_dict_proxy(self, did):
-        if self._dictcache.has_key(did):
+        if did in self._dictcache:
             return self._dictcache[did]
         dp = DictProxy(self._conn, self._oid, did)
         self._dictcache[did] = dp
diff --git a/Lib/idlelib/TreeWidget.py b/Lib/idlelib/TreeWidget.py
index c5c171f..1d777df 100644
--- a/Lib/idlelib/TreeWidget.py
+++ b/Lib/idlelib/TreeWidget.py
@@ -410,7 +410,7 @@
 
 class ScrolledCanvas:
     def __init__(self, master, **opts):
-        if not opts.has_key('yscrollincrement'):
+        if 'yscrollincrement' not in opts:
             opts['yscrollincrement'] = 17
         self.master = master
         self.frame = Frame(master)
diff --git a/Lib/idlelib/WidgetRedirector.py b/Lib/idlelib/WidgetRedirector.py
index df60cea..126a2cd 100644
--- a/Lib/idlelib/WidgetRedirector.py
+++ b/Lib/idlelib/WidgetRedirector.py
@@ -29,7 +29,7 @@
         tk.call("rename", orig, w)
 
     def register(self, name, function):
-        if self.dict.has_key(name):
+        if name in self.dict:
             previous = dict[name]
         else:
             previous = OriginalCommand(self, name)
@@ -38,7 +38,7 @@
         return previous
 
     def unregister(self, name):
-        if self.dict.has_key(name):
+        if name in self.dict:
             function = self.dict[name]
             del self.dict[name]
             if hasattr(self.widget, name):
diff --git a/Lib/idlelib/configDialog.py b/Lib/idlelib/configDialog.py
index 2d8835c..c1cbf82 100644
--- a/Lib/idlelib/configDialog.py
+++ b/Lib/idlelib/configDialog.py
@@ -550,7 +550,7 @@
 
     def AddChangedItem(self,type,section,item,value):
         value=str(value) #make sure we use a string
-        if not self.changedItems[type].has_key(section):
+        if section not in self.changedItems[type]:
             self.changedItems[type][section]={}
         self.changedItems[type][section][item]=value
 
@@ -697,7 +697,7 @@
             return
         #remove key set from config
         idleConf.userCfg['keys'].remove_section(keySetName)
-        if self.changedItems['keys'].has_key(keySetName):
+        if keySetName in self.changedItems['keys']:
             del(self.changedItems['keys'][keySetName])
         #write changes
         idleConf.userCfg['keys'].Save()
@@ -724,7 +724,7 @@
             return
         #remove theme from config
         idleConf.userCfg['highlight'].remove_section(themeName)
-        if self.changedItems['highlight'].has_key(themeName):
+        if themeName in self.changedItems['highlight']:
             del(self.changedItems['highlight'][themeName])
         #write changes
         idleConf.userCfg['highlight'].Save()
@@ -859,9 +859,9 @@
             #handle any unsaved changes to this theme
             if theme in self.changedItems['highlight'].keys():
                 themeDict=self.changedItems['highlight'][theme]
-                if themeDict.has_key(element+'-foreground'):
+                if element+'-foreground' in themeDict:
                     colours['foreground']=themeDict[element+'-foreground']
-                if themeDict.has_key(element+'-background'):
+                if element+'-background' in themeDict:
                     colours['background']=themeDict[element+'-background']
             self.textHighlightSample.tag_config(element, **colours)
         self.SetColourSample()
diff --git a/Lib/idlelib/rpc.py b/Lib/idlelib/rpc.py
index 3bac6a3..e3a42d9 100644
--- a/Lib/idlelib/rpc.py
+++ b/Lib/idlelib/rpc.py
@@ -169,7 +169,7 @@
             how, (oid, methodname, args, kwargs) = request
         except TypeError:
             return ("ERROR", "Bad request format")
-        if not self.objtable.has_key(oid):
+        if oid not in self.objtable:
             return ("ERROR", "Unknown object id: %r" % (oid,))
         obj = self.objtable[oid]
         if methodname == "__methods__":
@@ -304,7 +304,7 @@
             # wait for notification from socket handling thread
             cvar = self.cvars[myseq]
             cvar.acquire()
-            while not self.responses.has_key(myseq):
+            while myseq not in self.responses:
                 cvar.wait()
             response = self.responses[myseq]
             self.debug("_getresponse:%s: thread woke up: response: %s" %
@@ -552,7 +552,7 @@
             return MethodProxy(self.sockio, self.oid, name)
         if self.__attributes is None:
             self.__getattributes()
-        if self.__attributes.has_key(name):
+        if name in self.__attributes:
             value = self.sockio.remotecall(self.oid, '__getattribute__',
                                            (name,), {})
             return value