code: def task_compress_zlib():
      """zlib compression (C)"""
      import zlib
  
      with open(__file__, "rb") as f:
          arg = f.read(5000) * 3
  
      def compress(s):
          zlib.decompress(zlib.compress(s, 5))
  
      return compress, (arg,)
  
imports: from __future__ import division
  from __future__ import print_function
  import time
  import os
  import sys
  import itertools
  import threading
  import subprocess
  import socket
  from optparse import OptionParser, SUPPRESS_HELP
  import platform
label_desc: Use image node_id 4 for calling a global function with example usage: task_compress_zlib() and returns: compress,  arg