docstr: Calls `os.path.expanduser` on install_base, install_platbase and
  root.
docstr_tok: ["Calls","`","os.path.expanduser","`","on","install_base",",","install_platbase","and","root","."]
code: def expand_basedirs(self):
      """Calls `os.path.expanduser` on install_base, install_platbase and
      root."""
      self._expand_attrs(["install_base", "install_platbase", "root"])
  
imports: import sys
  import os
  import contextlib
  import sysconfig
  import itertools
  from distutils._log import log
  from ..core import Command
  from ..debug import DEBUG
  from ..sysconfig import get_config_vars
  from ..file_util import write_file
  from ..util import convert_path, subst_vars, change_root
  from ..util import get_platform
  from ..errors import DistutilsOptionError, DistutilsPlatformError
  from .None import _framework_compat
  from ..None import _collections
  from site import USER_BASE
  from site import USER_SITE
label_desc: Use image node_id 8 for calling the install obj's underlying member method code with example usage: obj.expand_basedirs() without return types