code: def resize(self, *e):
      bold = ("helvetica", -self._size.get(), "bold")
      helv = ("helvetica", -self._size.get())
      xspace = self._size.get()
      yspace = self._size.get()
      for widget in self._widgets:
          widget["node_font"] = bold
          widget["leaf_font"] = helv
          widget["xspace"] = xspace
          widget["yspace"] = yspace
          if self._size.get() < 20:
              widget["line_width"] = 1
          elif self._size.get() < 30:
              widget["line_width"] = 2
          else:
              widget["line_width"] = 3
      self._layout()
  
imports: from tkinter import IntVar, Menu, Tk
  from nltk.draw.util import BoxWidget, CanvasFrame, CanvasWidget, OvalWidget, ParenWidget, TextWidget
  from nltk.tree import Tree
  from nltk.util import in_idle
label_desc: Use image node_id 4 for calling the TreeView obj's underlying member method code with example usage: obj.resize() without return types