code: def dev_version():
      """
      Returns a hexdigest of all the python files in the module.
      """
  
      md5_hash = hashlib.md5()
      py_files = sorted(list_files(suffix=".py"))
      if not py_files:
          return ""
      for filename in py_files:
          with open(filename, "rb") as fobj:
              content = fobj.read()
          md5_hash.update(content)
      return md5_hash.hexdigest()
  
label_desc: Use image node_id 1 for calling a global function with example usage: dev_version() and returns: md5_hash, str