code: def jupyter_runtime_dir():
      """Return the runtime dir for transient jupyter files.
  
      Returns JUPYTER_RUNTIME_DIR if defined.
  
      The default is now (data_dir)/runtime on all platforms;
      we no longer use XDG_RUNTIME_DIR after various problems.
      """
      env = os.environ
  
      if env.get("JUPYTER_RUNTIME_DIR"):
          return env["JUPYTER_RUNTIME_DIR"]
  
      return pjoin(jupyter_data_dir(), "runtime")
  
imports: import os
  import sys
  import stat
  import errno
  import tempfile
  import warnings
  from ipython_genutils import py3compat
  from contextlib import contextmanager
  from distutils.util import strtobool
  from ipython_genutils import py3compat
label_desc: Use image node_id 5 for calling a global function with example usage: jupyter_runtime_dir() and returns: pjoin, env