code: def lib_dir(self):
      return os.path.join(self.install_dir, "lib")
  
imports: from __future__ import print_function
  import argparse
  from datetime import datetime
  import logging
  import os
  import re
  import shutil
  import subprocess
  import sys
  import tarfile
label_desc: Use image node_id 10 for calling the AbstractBuilder obj's underlying member method code with example usage: obj.lib_dir() and returns: os