text: """
  Extra modules utilities for :py:mod:`mtb` module.
  
  
  Copyright (C) CERN 2013-2021
  """
  
  try:
      import hashlib
      md5_hash = hashlib.md5
  except ImportError:
      import md5
      md5_hash = md5.md5
  
  try:
      from urllib import unquote
  except ImportError:
      from urllib.parse import unquote
  
  try:
      import simplejson as json
  except (SyntaxError, ImportError):
      import json
      try:
          getattr(json, "dumps")
      except AttributeError:
          raise ImportError("No available json module.")
  