text: from os import mkdir, remove
  from os.path import isfile, isdir
  from shutil import rmtree
  from tkinter import Tk
  from tkinter.filedialog import askdirectory, askopenfilename
  from typing import List, NoReturn, Tuple
  
  
  def create_workdir(work_directory: str) -> NoReturn:
      # Set up a working directory.
      if not isdir(work_directory):
          mkdir(work_directory)
      else:
          rmtree(work_directory)
          mkdir(work_directory)
  
  
  def delete_workdir(work_directory: str) -> NoReturn:
      if not isdir(work_directory):
          rmtree(work_directory)
  
  
  def delete_file(filepath: str) -> NoReturn:
      if isfile(filepath):
          remove(filepath)
  
  
  def ask_directry() -> str:
      _root = Tk()
      _root.withdraw()
      result = askdirectory()
      _root.destroy()
      return result
  
  
  def ask_open_file(filetypes: List[Tuple[str, str]]) -> str:
      _root = Tk()
      _root.withdraw()
      result = askopenfilename(filetypes=filetypes)
      _root.destroy()
      return result