diff --git a/Lib/idlelib/configHandler.py b/Lib/idlelib/configHandler.py
index a9957c5..1c347f6 100644
--- a/Lib/idlelib/configHandler.py
+++ b/Lib/idlelib/configHandler.py
@@ -15,8 +15,9 @@
 the retrieval of config information. When a default is returned instead of
 a requested config value, a message is printed to stderr to aid in
 configuration problem notification and resolution.
-
 """
+# TODOs added Oct 2014, tjr
+
 import os
 import sys
 
@@ -35,7 +36,7 @@
         """
         cfgFile - string, fully specified configuration file name
         """
-        self.file=cfgFile
+        self.file = cfgFile
         ConfigParser.__init__(self, defaults=cfgDefaults, strict=False)
 
     def Get(self, section, option, type=None, default=None, raw=False):
@@ -45,26 +46,22 @@
         """
         if not self.has_option(section, option):
             return default
-        if type=='bool':
+        if type == 'bool':
             return self.getboolean(section, option)
-        elif type=='int':
+        elif type == 'int':
             return self.getint(section, option)
         else:
             return self.get(section, option, raw=raw)
 
-    def GetOptionList(self,section):
-        """
-        Get an option list for given section
-        """
+    def GetOptionList(self, section):
+        "Return a list of options for given section, else []."
         if self.has_section(section):
             return self.options(section)
         else:  #return a default value
             return []
 
     def Load(self):
-        """
-        Load the configuration file from disk
-        """
+        "Load the configuration file from disk."
         self.read(self.file)
 
 class IdleUserConfParser(IdleConfParser):
@@ -72,61 +69,50 @@
     IdleConfigParser specialised for user configuration handling.
     """
 
-    def AddSection(self,section):
-        """
-        if section doesn't exist, add it
-        """
+    def AddSection(self, section):
+        "If section doesn't exist, add it."
         if not self.has_section(section):
             self.add_section(section)
 
     def RemoveEmptySections(self):
-        """
-        remove any sections that have no options
-        """
+        "Remove any sections that have no options."
         for section in self.sections():
             if not self.GetOptionList(section):
                 self.remove_section(section)
 
     def IsEmpty(self):
-        """
-        Remove empty sections and then return 1 if parser has no sections
-        left, else return 0.
-        """
+        "Return True if no sections after removing empty sections."
         self.RemoveEmptySections()
-        if self.sections():
-            return 0
-        else:
-            return 1
+        return not self.sections()
 
-    def RemoveOption(self,section,option):
-        """
-        If section/option exists, remove it.
-        Returns 1 if option was removed, 0 otherwise.
+    def RemoveOption(self, section, option):
+        """Return True if option is removed from section, else False.
+
+        False if either section does not exist or did not have option.
         """
         if self.has_section(section):
-            return self.remove_option(section,option)
+            return self.remove_option(section, option)
+        return False
 
-    def SetOption(self,section,option,value):
+    def SetOption(self, section, option, value):
+        """Return True if option is added or changed to value, else False.
+
+        Add section if required.  False means option already had value.
         """
-        Sets option to value, adding section if required.
-        Returns 1 if option was added or changed, otherwise 0.
-        """
-        if self.has_option(section,option):
-            if self.get(section,option)==value:
-                return 0
+        if self.has_option(section, option):
+            if self.get(section, option) == value:
+                return False
             else:
-                self.set(section,option,value)
-                return 1
+                self.set(section, option, value)
+                return True
         else:
             if not self.has_section(section):
                 self.add_section(section)
-            self.set(section,option,value)
-            return 1
+            self.set(section, option, value)
+            return True
 
     def RemoveFile(self):
-        """
-        Removes the user config file from disk if it exists.
-        """
+        "Remove user config file self.file from disk if it exists."
         if os.path.exists(self.file):
             os.remove(self.file)
 
@@ -150,60 +136,57 @@
             self.RemoveFile()
 
 class IdleConf:
-    """
-    holds config parsers for all idle config files:
-    default config files
-        (idle install dir)/config-main.def
-        (idle install dir)/config-extensions.def
-        (idle install dir)/config-highlight.def
-        (idle install dir)/config-keys.def
-    user config  files
-        (user home dir)/.idlerc/config-main.cfg
-        (user home dir)/.idlerc/config-extensions.cfg
-        (user home dir)/.idlerc/config-highlight.cfg
-        (user home dir)/.idlerc/config-keys.cfg
+    """Hold config parsers for all idle config files in singleton instance.
+
+    Default config files, self.defaultCfg --
+        for config_type in self.config_types:
+            (idle install dir)/config-{config-type}.def
+
+    User config files, self.userCfg --
+        for config_type in self.config_types:
+        (user home dir)/.idlerc/config-{config-type}.cfg
     """
     def __init__(self):
-        self.defaultCfg={}
-        self.userCfg={}
-        self.cfg={}
+        self.config_types = ('main', 'extensions', 'highlight', 'keys')
+        self.defaultCfg = {}
+        self.userCfg = {}
+        self.cfg = {}  # TODO use to select userCfg vs defaultCfg
         self.CreateConfigHandlers()
         self.LoadCfgFiles()
-        #self.LoadCfg()
+
 
     def CreateConfigHandlers(self):
-        """
-        set up a dictionary of config parsers for default and user
-        configurations respectively
-        """
+        "Populate default and user config parser dictionaries."
         #build idle install path
         if __name__ != '__main__': # we were imported
             idleDir=os.path.dirname(__file__)
         else: # we were exec'ed (for testing only)
             idleDir=os.path.abspath(sys.path[0])
         userDir=self.GetUserCfgDir()
-        configTypes=('main','extensions','highlight','keys')
-        defCfgFiles={}
-        usrCfgFiles={}
-        for cfgType in configTypes: #build config file names
-            defCfgFiles[cfgType]=os.path.join(idleDir,'config-'+cfgType+'.def')
-            usrCfgFiles[cfgType]=os.path.join(userDir,'config-'+cfgType+'.cfg')
-        for cfgType in configTypes: #create config parsers
-            self.defaultCfg[cfgType]=IdleConfParser(defCfgFiles[cfgType])
-            self.userCfg[cfgType]=IdleUserConfParser(usrCfgFiles[cfgType])
+
+        defCfgFiles = {}
+        usrCfgFiles = {}
+        # TODO eliminate these temporaries by combining loops
+        for cfgType in self.config_types: #build config file names
+            defCfgFiles[cfgType] = os.path.join(
+                    idleDir, 'config-' + cfgType + '.def')
+            usrCfgFiles[cfgType] = os.path.join(
+                    userDir, 'config-' + cfgType + '.cfg')
+        for cfgType in self.config_types: #create config parsers
+            self.defaultCfg[cfgType] = IdleConfParser(defCfgFiles[cfgType])
+            self.userCfg[cfgType] = IdleUserConfParser(usrCfgFiles[cfgType])
 
     def GetUserCfgDir(self):
-        """
-        Creates (if required) and returns a filesystem directory for storing
-        user config files.
+        """Return a filesystem directory for storing user config files.
 
+        Creates it if required.
         """
         cfgDir = '.idlerc'
         userDir = os.path.expanduser('~')
         if userDir != '~': # expanduser() found user home dir
             if not os.path.exists(userDir):
-                warn = ('\n Warning: os.path.expanduser("~") points to\n '+
-                        userDir+',\n but the path does not exist.')
+                warn = ('\n Warning: os.path.expanduser("~") points to\n ' +
+                        userDir + ',\n but the path does not exist.')
                 try:
                     print(warn, file=sys.stderr)
                 except OSError:
@@ -217,28 +200,28 @@
             try:
                 os.mkdir(userDir)
             except OSError:
-                warn = ('\n Warning: unable to create user config directory\n'+
-                        userDir+'\n Check path and permissions.\n Exiting!\n')
+                warn = ('\n Warning: unable to create user config directory\n' +
+                        userDir + '\n Check path and permissions.\n Exiting!\n')
                 print(warn, file=sys.stderr)
                 raise SystemExit
+        # TODO continue without userDIr instead of exit
         return userDir
 
     def GetOption(self, configType, section, option, default=None, type=None,
                   warn_on_default=True, raw=False):
-        """
-        Get an option value for given config type and given general
-        configuration section/option or return a default. If type is specified,
-        return as type. Firstly the user configuration is checked, with a
-        fallback to the default configuration, and a final 'catch all'
-        fallback to a useable passed-in default if the option isn't present in
-        either the user or the default configuration.
-        configType must be one of ('main','extensions','highlight','keys')
-        If a default is returned, and warn_on_default is True, a warning is
-        printed to stderr.
+        """Return a value for configType section option, or default.
 
+        If type is not None, return a value of that type.  Also pass raw
+        to the config parser.  First try to return a valid value
+        (including type) from a user configuration. If that fails, try
+        the default configuration. If that fails, return default, with a
+        default of None.
+
+        Warn if either user or default configurations have an invalid value.
+        Warn if default is returned and warn_on_default is True.
         """
         try:
-            if self.userCfg[configType].has_option(section,option):
+            if self.userCfg[configType].has_option(section, option):
                 return self.userCfg[configType].Get(section, option,
                                                     type=type, raw=raw)
         except ValueError:
@@ -246,16 +229,15 @@
                        ' invalid %r value for configuration option %r\n'
                        ' from section %r: %r' %
                        (type, option, section,
-                        self.userCfg[configType].Get(section, option,
-                                                     raw=raw)))
+                       self.userCfg[configType].Get(section, option, raw=raw)))
             try:
                 print(warning, file=sys.stderr)
             except OSError:
                 pass
         try:
             if self.defaultCfg[configType].has_option(section,option):
-                return self.defaultCfg[configType].Get(section, option,
-                                                       type=type, raw=raw)
+                return self.defaultCfg[configType].Get(
+                        section, option, type=type, raw=raw)
         except ValueError:
             pass
         #returning default, print warning
@@ -272,22 +254,19 @@
         return default
 
     def SetOption(self, configType, section, option, value):
-        """In user's config file, set section's option to value.
-
-        """
+        """Set section option to value in user config file."""
         self.userCfg[configType].SetOption(section, option, value)
 
     def GetSectionList(self, configSet, configType):
-        """
-        Get a list of sections from either the user or default config for
-        the given config type.
+        """Return sections for configSet configType configuration.
+
         configSet must be either 'user' or 'default'
-        configType must be one of ('main','extensions','highlight','keys')
+        configType must be in self.config_types.
         """
-        if not (configType in ('main','extensions','highlight','keys')):
+        if not (configType in self.config_types):
             raise InvalidConfigType('Invalid configType specified')
         if configSet == 'user':
-            cfgParser=self.userCfg[configType]
+            cfgParser = self.userCfg[configType]
         elif configSet == 'default':
             cfgParser=self.defaultCfg[configType]
         else:
@@ -295,22 +274,22 @@
         return cfgParser.sections()
 
     def GetHighlight(self, theme, element, fgBg=None):
-        """
-        return individual highlighting theme elements.
+        """Return individual highlighting theme elements.
+
         fgBg - string ('fg'or'bg') or None, if None return a dictionary
         containing fg and bg colours (appropriate for passing to Tkinter in,
         e.g., a tag_config call), otherwise fg or bg colour only as specified.
         """
         if self.defaultCfg['highlight'].has_section(theme):
-            themeDict=self.GetThemeDict('default',theme)
+            themeDict = self.GetThemeDict('default', theme)
         else:
-            themeDict=self.GetThemeDict('user',theme)
-        fore=themeDict[element+'-foreground']
-        if element=='cursor': #there is no config value for cursor bg
-            back=themeDict['normal-background']
+            themeDict = self.GetThemeDict('user', theme)
+        fore = themeDict[element + '-foreground']
+        if element == 'cursor': #there is no config value for cursor bg
+            back = themeDict['normal-background']
         else:
-            back=themeDict[element+'-background']
-        highlight={"foreground": fore,"background": back}
+            back = themeDict[element + '-background']
+        highlight = {"foreground": fore, "background": back}
         if not fgBg: #return dict of both colours
             return highlight
         else: #return specified colour only
@@ -321,26 +300,26 @@
             else:
                 raise InvalidFgBg('Invalid fgBg specified')
 
-    def GetThemeDict(self,type,themeName):
-        """
+    def GetThemeDict(self, type, themeName):
+        """Return {option:value} dict for elements in themeName.
+
         type - string, 'default' or 'user' theme type
         themeName - string, theme name
-        Returns a dictionary which holds {option:value} for each element
-        in the specified theme. Values are loaded over a set of ultimate last
-        fallback defaults to guarantee that all theme elements are present in
-        a newly created theme.
+        Values are loaded over ultimate fallback defaults to guarantee
+        that all theme elements are present in a newly created theme.
         """
         if type == 'user':
-            cfgParser=self.userCfg['highlight']
+            cfgParser = self.userCfg['highlight']
         elif type == 'default':
-            cfgParser=self.defaultCfg['highlight']
+            cfgParser = self.defaultCfg['highlight']
         else:
             raise InvalidTheme('Invalid theme type specified')
         #foreground and background values are provded for each theme element
         #(apart from cursor) even though all these values are not yet used
         #by idle, to allow for their use in the future. Default values are
         #generally black and white.
-        theme={ 'normal-foreground':'#000000',
+        # TODO make theme, a constant, a module or class attribute
+        theme ={'normal-foreground':'#000000',
                 'normal-background':'#ffffff',
                 'keyword-foreground':'#000000',
                 'keyword-background':'#ffffff',
@@ -370,9 +349,9 @@
                 'console-foreground':'#000000',
                 'console-background':'#ffffff' }
         for element in theme:
-            if not cfgParser.has_option(themeName,element):
+            if not cfgParser.has_option(themeName, element):
                 #we are going to return a default, print warning
-                warning=('\n Warning: configHandler.py - IdleConf.GetThemeDict'
+                warning = ('\n Warning: configHandler.py - IdleConf.GetThemeDict'
                            ' -\n problem retrieving theme element %r'
                            '\n from theme %r.\n'
                            ' returning default value: %r' %
@@ -381,41 +360,39 @@
                     print(warning, file=sys.stderr)
                 except OSError:
                     pass
-            colour=cfgParser.Get(themeName,element,default=theme[element])
-            theme[element]=colour
+            colour = cfgParser.Get(themeName, element, default=theme[element])
+            theme[element] = colour
         return theme
 
     def CurrentTheme(self):
-        """
-        Returns the name of the currently active theme
-        """
-        return self.GetOption('main','Theme','name',default='')
+        "Return the name of the currently active theme."
+        return self.GetOption('main', 'Theme', 'name', default='')
 
     def CurrentKeys(self):
-        """
-        Returns the name of the currently active key set
-        """
-        return self.GetOption('main','Keys','name',default='')
+        "Return the name of the currently active key set."
+        return self.GetOption('main', 'Keys', 'name', default='')
 
     def GetExtensions(self, active_only=True, editor_only=False, shell_only=False):
+        """Return extensions in default and user config-extensions files.
+
+        If active_only True, only return active (enabled) extensions
+        and optionally only editor or shell extensions.
+        If active_only False, return all extensions.
         """
-        Gets a list of all idle extensions declared in the config files.
-        active_only - boolean, if true only return active (enabled) extensions
-        """
-        extns=self.RemoveKeyBindNames(
-                self.GetSectionList('default','extensions'))
-        userExtns=self.RemoveKeyBindNames(
-                self.GetSectionList('user','extensions'))
+        extns = self.RemoveKeyBindNames(
+                self.GetSectionList('default', 'extensions'))
+        userExtns = self.RemoveKeyBindNames(
+                self.GetSectionList('user', 'extensions'))
         for extn in userExtns:
             if extn not in extns: #user has added own extension
                 extns.append(extn)
         if active_only:
-            activeExtns=[]
+            activeExtns = []
             for extn in extns:
                 if self.GetOption('extensions', extn, 'enable', default=True,
                                   type='bool'):
                     #the extension is enabled
-                    if editor_only or shell_only:
+                    if editor_only or shell_only:  # TODO if both, contradictory
                         if editor_only:
                             option = "enable_editor"
                         else:
@@ -430,107 +407,108 @@
         else:
             return extns
 
-    def RemoveKeyBindNames(self,extnNameList):
-        #get rid of keybinding section names
-        names=extnNameList
-        kbNameIndicies=[]
+    def RemoveKeyBindNames(self, extnNameList):
+        "Return extnNameList with keybinding section names removed."
+        # TODO Easier to return filtered copy with list comp
+        names = extnNameList
+        kbNameIndicies = []
         for name in names:
             if name.endswith(('_bindings', '_cfgBindings')):
                 kbNameIndicies.append(names.index(name))
-        kbNameIndicies.sort()
-        kbNameIndicies.reverse()
+        kbNameIndicies.sort(reverse=True)
         for index in kbNameIndicies: #delete each keybinding section name
             del(names[index])
         return names
 
-    def GetExtnNameForEvent(self,virtualEvent):
+    def GetExtnNameForEvent(self, virtualEvent):
+        """Return the name of the extension binding virtualEvent, or None.
+
+        virtualEvent - string, name of the virtual event to test for,
+                       without the enclosing '<< >>'
         """
-        Returns the name of the extension that virtualEvent is bound in, or
-        None if not bound in any extension.
-        virtualEvent - string, name of the virtual event to test for, without
-                       the enclosing '<< >>'
-        """
-        extName=None
-        vEvent='<<'+virtualEvent+'>>'
+        extName = None
+        vEvent = '<<' + virtualEvent + '>>'
         for extn in self.GetExtensions(active_only=0):
             for event in self.GetExtensionKeys(extn):
                 if event == vEvent:
-                    extName=extn
+                    extName = extn  # TODO return here?
         return extName
 
-    def GetExtensionKeys(self,extensionName):
+    def GetExtensionKeys(self, extensionName):
+        """Return dict: {configurable extensionName event : active keybinding}.
+
+        Events come from default config extension_cfgBindings section.
+        Keybindings come from GetCurrentKeySet() active key dict,
+        where previously used bindings are disabled.
         """
-        returns a dictionary of the configurable keybindings for a particular
-        extension,as they exist in the dictionary returned by GetCurrentKeySet;
-        that is, where previously used bindings are disabled.
-        """
-        keysName=extensionName+'_cfgBindings'
-        activeKeys=self.GetCurrentKeySet()
-        extKeys={}
+        keysName = extensionName + '_cfgBindings'
+        activeKeys = self.GetCurrentKeySet()
+        extKeys = {}
         if self.defaultCfg['extensions'].has_section(keysName):
-            eventNames=self.defaultCfg['extensions'].GetOptionList(keysName)
+            eventNames = self.defaultCfg['extensions'].GetOptionList(keysName)
             for eventName in eventNames:
-                event='<<'+eventName+'>>'
-                binding=activeKeys[event]
-                extKeys[event]=binding
+                event = '<<' + eventName + '>>'
+                binding = activeKeys[event]
+                extKeys[event] = binding
         return extKeys
 
     def __GetRawExtensionKeys(self,extensionName):
+        """Return dict {configurable extensionName event : keybinding list}.
+
+        Events come from default config extension_cfgBindings section.
+        Keybindings list come from the splitting of GetOption, which
+        tries user config before default config.
         """
-        returns a dictionary of the configurable keybindings for a particular
-        extension, as defined in the configuration files, or an empty dictionary
-        if no bindings are found
-        """
-        keysName=extensionName+'_cfgBindings'
-        extKeys={}
+        keysName = extensionName+'_cfgBindings'
+        extKeys = {}
         if self.defaultCfg['extensions'].has_section(keysName):
-            eventNames=self.defaultCfg['extensions'].GetOptionList(keysName)
+            eventNames = self.defaultCfg['extensions'].GetOptionList(keysName)
             for eventName in eventNames:
-                binding=self.GetOption('extensions',keysName,
-                        eventName,default='').split()
-                event='<<'+eventName+'>>'
-                extKeys[event]=binding
+                binding = self.GetOption(
+                        'extensions', keysName, eventName, default='').split()
+                event = '<<' + eventName + '>>'
+                extKeys[event] = binding
         return extKeys
 
-    def GetExtensionBindings(self,extensionName):
+    def GetExtensionBindings(self, extensionName):
+        """Return dict {extensionName event : active or defined keybinding}.
+
+        Augment self.GetExtensionKeys(extensionName) with mapping of non-
+        configurable events (from default config) to GetOption splits,
+        as in self.__GetRawExtensionKeys.
         """
-        Returns a dictionary of all the event bindings for a particular
-        extension. The configurable keybindings are returned as they exist in
-        the dictionary returned by GetCurrentKeySet; that is, where re-used
-        keybindings are disabled.
-        """
-        bindsName=extensionName+'_bindings'
-        extBinds=self.GetExtensionKeys(extensionName)
+        bindsName = extensionName + '_bindings'
+        extBinds = self.GetExtensionKeys(extensionName)
         #add the non-configurable bindings
         if self.defaultCfg['extensions'].has_section(bindsName):
-            eventNames=self.defaultCfg['extensions'].GetOptionList(bindsName)
+            eventNames = self.defaultCfg['extensions'].GetOptionList(bindsName)
             for eventName in eventNames:
-                binding=self.GetOption('extensions',bindsName,
-                        eventName,default='').split()
-                event='<<'+eventName+'>>'
-                extBinds[event]=binding
+                binding = self.GetOption(
+                        'extensions', bindsName, eventName, default='').split()
+                event = '<<' + eventName + '>>'
+                extBinds[event] = binding
 
         return extBinds
 
     def GetKeyBinding(self, keySetName, eventStr):
+        """Return the keybinding list for keySetName eventStr.
+
+        keySetName - name of key binding set (config-keys section).
+        eventStr - virtual event, including brackets, as in '<<event>>'.
         """
-        returns the keybinding for a specific event.
-        keySetName - string, name of key binding set
-        eventStr - string, the virtual event we want the binding for,
-                   represented as a string, eg. '<<event>>'
-        """
-        eventName=eventStr[2:-2] #trim off the angle brackets
-        binding=self.GetOption('keys',keySetName,eventName,default='').split()
+        eventName = eventStr[2:-2] #trim off the angle brackets
+        binding = self.GetOption('keys', keySetName, eventName, default='').split()
         return binding
 
     def GetCurrentKeySet(self):
+        "Return CurrentKeys with 'darwin' modifications."
         result = self.GetKeySet(self.CurrentKeys())
 
         if sys.platform == "darwin":
             # OS X Tk variants do not support the "Alt" keyboard modifier.
             # So replace all keybingings that use "Alt" with ones that
             # use the "Option" keyboard modifier.
-            # TO DO: the "Option" modifier does not work properly for
+            # TODO (Ned?): the "Option" modifier does not work properly for
             #        Cocoa Tk and XQuartz Tk so we should not use it
             #        in default OS X KeySets.
             for k, v in result.items():
@@ -540,40 +518,43 @@
 
         return result
 
-    def GetKeySet(self,keySetName):
+    def GetKeySet(self, keySetName):
+        """Return event-key dict for keySetName core plus active extensions.
+
+        If a binding defined in an extension is already in use, the
+        extension binding is disabled by being set to ''
         """
-        Returns a dictionary of: all requested core keybindings, plus the
-        keybindings for all currently active extensions. If a binding defined
-        in an extension is already in use, that binding is disabled.
-        """
-        keySet=self.GetCoreKeys(keySetName)
-        activeExtns=self.GetExtensions(active_only=1)
+        keySet = self.GetCoreKeys(keySetName)
+        activeExtns = self.GetExtensions(active_only=1)
         for extn in activeExtns:
-            extKeys=self.__GetRawExtensionKeys(extn)
+            extKeys = self.__GetRawExtensionKeys(extn)
             if extKeys: #the extension defines keybindings
                 for event in extKeys:
                     if extKeys[event] in keySet.values():
                         #the binding is already in use
-                        extKeys[event]='' #disable this binding
-                    keySet[event]=extKeys[event] #add binding
+                        extKeys[event] = '' #disable this binding
+                    keySet[event] = extKeys[event] #add binding
         return keySet
 
-    def IsCoreBinding(self,virtualEvent):
-        """
-        returns true if the virtual event is bound in the core idle keybindings.
-        virtualEvent - string, name of the virtual event to test for, without
-                       the enclosing '<< >>'
+    def IsCoreBinding(self, virtualEvent):
+        """Return True if the virtual event is one of the core idle key events.
+
+        virtualEvent - string, name of the virtual event to test for,
+                       without the enclosing '<< >>'
         """
         return ('<<'+virtualEvent+'>>') in self.GetCoreKeys()
 
+# TODO make keyBindins a file or class attribute used for test above
+# and copied in function below
+
     def GetCoreKeys(self, keySetName=None):
-        """
-        returns the requested set of core keybindings, with fallbacks if
-        required.
-        Keybindings loaded from the config file(s) are loaded _over_ these
-        defaults, so if there is a problem getting any core binding there will
-        be an 'ultimate last resort fallback' to the CUA-ish bindings
-        defined here.
+        """Return dict of core virtual-key keybindings for keySetName.
+
+        The default keySetName None corresponds to the keyBindings base
+        dict. If keySetName is not None, bindings from the config
+        file(s) are loaded _over_ these defaults, so if there is a
+        problem getting any core binding there will be an 'ultimate last
+        resort fallback' to the CUA-ish bindings defined here.
         """
         keyBindings={
             '<<copy>>': ['<Control-c>', '<Control-C>'],
@@ -628,9 +609,9 @@
             }
         if keySetName:
             for event in keyBindings:
-                binding=self.GetKeyBinding(keySetName,event)
+                binding = self.GetKeyBinding(keySetName, event)
                 if binding:
-                    keyBindings[event]=binding
+                    keyBindings[event] = binding
                 else: #we are going to return a default, print warning
                     warning=('\n Warning: configHandler.py - IdleConf.GetCoreKeys'
                                ' -\n problem retrieving key binding for event %r'
@@ -643,8 +624,8 @@
                         pass
         return keyBindings
 
-    def GetExtraHelpSourceList(self,configSet):
-        """Fetch list of extra help sources from a given configSet.
+    def GetExtraHelpSourceList(self, configSet):
+        """Return list of extra help sources from a given configSet.
 
         Valid configSets are 'user' or 'default'.  Return a list of tuples of
         the form (menu_item , path_to_help_file , option), or return the empty
@@ -653,19 +634,19 @@
         therefore the returned list must be sorted by 'option'.
 
         """
-        helpSources=[]
-        if configSet=='user':
-            cfgParser=self.userCfg['main']
-        elif configSet=='default':
-            cfgParser=self.defaultCfg['main']
+        helpSources = []
+        if configSet == 'user':
+            cfgParser = self.userCfg['main']
+        elif configSet == 'default':
+            cfgParser = self.defaultCfg['main']
         else:
             raise InvalidConfigSet('Invalid configSet specified')
         options=cfgParser.GetOptionList('HelpFiles')
         for option in options:
-            value=cfgParser.Get('HelpFiles',option,default=';')
-            if value.find(';')==-1: #malformed config entry with no ';'
-                menuItem='' #make these empty
-                helpPath='' #so value won't be added to list
+            value=cfgParser.Get('HelpFiles', option, default=';')
+            if value.find(';') == -1: #malformed config entry with no ';'
+                menuItem = '' #make these empty
+                helpPath = '' #so value won't be added to list
             else: #config entry contains ';' as expected
                 value=value.split(';')
                 menuItem=value[0].strip()
@@ -676,47 +657,44 @@
         return helpSources
 
     def GetAllExtraHelpSourcesList(self):
+        """Return a list of the details of all additional help sources.
+
+        Tuples in the list are those of GetExtraHelpSourceList.
         """
-        Returns a list of tuples containing the details of all additional help
-        sources configured, or an empty list if there are none. Tuples are of
-        the format returned by GetExtraHelpSourceList.
-        """
-        allHelpSources=( self.GetExtraHelpSourceList('default')+
+        allHelpSources = (self.GetExtraHelpSourceList('default') +
                 self.GetExtraHelpSourceList('user') )
         return allHelpSources
 
     def LoadCfgFiles(self):
-        """
-        load all configuration files.
-        """
+        "Load all configuration files."
         for key in self.defaultCfg:
             self.defaultCfg[key].Load()
             self.userCfg[key].Load() #same keys
 
     def SaveUserCfgFiles(self):
-        """
-        write all loaded user configuration files back to disk
-        """
+        "Write all loaded user configuration files to disk."
         for key in self.userCfg:
             self.userCfg[key].Save()
 
-idleConf=IdleConf()
 
+idleConf = IdleConf()
+
+# TODO Revise test output, write expanded unittest
 ### module test
 if __name__ == '__main__':
     def dumpCfg(cfg):
-        print('\n',cfg,'\n')
+        print('\n', cfg, '\n')
         for key in cfg:
-            sections=cfg[key].sections()
+            sections = cfg[key].sections()
             print(key)
             print(sections)
             for section in sections:
-                options=cfg[key].options(section)
+                options = cfg[key].options(section)
                 print(section)
                 print(options)
                 for option in options:
-                    print(option, '=', cfg[key].Get(section,option))
+                    print(option, '=', cfg[key].Get(section, option))
     dumpCfg(idleConf.defaultCfg)
     dumpCfg(idleConf.userCfg)
-    print(idleConf.userCfg['main'].Get('Theme','name'))
+    print(idleConf.userCfg['main'].Get('Theme', 'name'))
     #print idleConf.userCfg['highlight'].GetDefHighlight('Foo','normal')