class_docstr: 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
class_docstr_tok: ["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"]
code: def default_keys():
      if sys.platform[:3] == "win":
          return "IDLE Classic Windows"
      elif sys.platform == "darwin":
          return "IDLE Classic OSX"
      else:
          return "IDLE Modern Unix"
  
imports: from configparser import ConfigParser
  import os
  import sys
  from tkinter.font import Font
  import idlelib
label_desc: Use image node_id 12 for calling the IdleConf obj's underlying member method code with example usage: obj.default_keys() and returns: str, str, str