code: def init(self, flist):
      self.flist = flist
      # reset pyclbr
      pyclbr._modules.clear()
      # create top
      self.top = top = ListedToplevel(flist.root)
      top.protocol("WM_DELETE_WINDOW", self.close)
      top.bind("<Escape>", self.close)
      if self._htest:  # place dialog below parent if running htest
          top.geometry(
              "+%d+%d"
              % (
                  flist.root.winfo_rootx(),
                  flist.root.winfo_rooty() + 200,
              )
          )
      self.settitle()
      top.focus_set()
      # create scrolled canvas
      theme = idleConf.CurrentTheme()
      background = idleConf.GetHighlight(theme, "normal")["background"]
      sc = ScrolledCanvas(
          top, bg=background, highlightthickness=0, takefocus=1
      )
      sc.frame.pack(expand=1, fill="both")
      item = self.rootnode()
      self.node = node = TreeNode(sc.canvas, None, item)
      node.update()
      node.expand()
  
imports: import os
  import sys
  import pyclbr
  from idlelib import PyShell
  from idlelib.WindowList import ListedToplevel
  from idlelib.TreeWidget import TreeNode, TreeItem, ScrolledCanvas
  from idlelib.configHandler import idleConf
label_desc: Use image node_id 3 for calling the ClassBrowser obj's underlying member method code with example usage: obj.init(flist) without return types