code: def bestsize(self):
      sizes = self.itersizes()
      if not sizes:
          msg = "No 32bit icon resources found"
          raise SyntaxError(msg)
      return max(sizes)
  
imports: import io
  import os
  import struct
  import sys
  from .None import Image, ImageFile, PngImagePlugin, features
label_desc: Use image node_id 3 for calling the IcnsFile obj's underlying member method code with example usage: obj.bestsize() and returns: max