docstr: Calls `os.path.expanduser` on install dirs.
code: def expand_dirs(self):
      """Calls `os.path.expanduser` on install dirs."""
      self._expand_attrs(
          [
              "install_purelib",
              "install_platlib",
              "install_lib",
              "install_headers",
              "install_scripts",
              "install_data",
          ]
      )
  
imports: import sys
  import sysconfig
  import os
  import re
  from distutils import log
  from distutils.core import Command
  from distutils.debug import DEBUG
  from distutils.sysconfig import get_config_vars
  from distutils.errors import DistutilsPlatformError
  from distutils.file_util import write_file
  from distutils.util import convert_path, subst_vars, change_root
  from distutils.util import get_platform
  from distutils.errors import DistutilsOptionError
  from site import USER_BASE
  from site import USER_SITE
label_desc: Use image node_id 9 for calling the install obj's underlying member method code with example usage: obj.expand_dirs() without return types