code: def freedesktop_os_release():
      """Return operation system identification from freedesktop.org os-release"""
      global _os_release_cache
  
      if _os_release_cache is None:
          errno = None
          for candidate in _os_release_candidates:
              try:
                  with open(candidate, encoding="utf-8") as f:
                      _os_release_cache = _parse_os_release(f)
                  break
              except OSError as e:
                  errno = e.errno
          else:
              raise OSError(
                  errno,
                  f"Unable to read files {', '.join(_os_release_candidates)}",
              )
  
      return _os_release_cache.copy()
  
imports: import collections
  import os
  import re
  import sys
  import functools
  import itertools
label_desc: Use image node_id 39 for calling a global function with example usage: freedesktop_os_release() and returns: _os_release_cache