code: def wait_for_background_commands():
      """This waits for all threads to exit.  You will often want to
      run this at the end of programs that have launched background
      threads, so that the program will wait for its child processes
      to terminate before it dies."""
      for t in threading.enumerate():
          if not t == threading.current_thread():
              t.join()
  
imports: from __future__ import print_function
  from __future__ import division
  import argparse
  import logging
  import math
  import os
  import subprocess
  import sys
  import threading
label_desc: Use image node_id 6 for calling a global function with example usage: wait_for_background_commands() without return types