code: def is_all_white(line):
      """Return True if line is empty or all whitespace."""
  
      return re.match(r"^\s*$", line) is not None
  
imports: import re
  from tkinter.messagebox import askyesno
  from tkinter.simpledialog import askinteger
  from idlelib.config import idleConf
label_desc: Use image node_id 4 for calling a global function with example usage: is_all_white(line) and returns: unknown