code: def closeEvent(self, event):
      self.queNum.put(-1)
      event.accept()
  
file_path: pymudf/docs/samples/multiprocess-gui.py
imports: import os
  import sys
  import time
  import multiprocessing
  import queue
  import fitz
  from pkgutil import iter_modules
label_desc: Use image node_id 9 for calling the DocForm obj's underlying member method code with example usage: obj.closeEvent(event) without return types