code: def _open_f(args):
      if args.cmd:
          return _subproc_f(args.cmd)
      if args.shell or args.shell_cmd:
          return _shell_f(args.shell_cmd)
      if os.name == "nt":
          return os.startfile
      if sys.platform.startswith("darwin"):
          return _subproc_f("open")
      if os.name == "posix":
          return _subproc_f("xdg-open")
      cli.error(
          f"unsupported platform: {sys.platform} {os.name}\n"
          "Try --cmd to explicitly provide a command or "
          "'guild open --help' for more information."
      )
  
imports: import logging
  import os
  import shlex
  import shutil
  import subprocess
  import sys
  from guild import cli
  from guild import cmd_impl_support
  from guild import run_util
  from guild import util
  from .None import runs_impl
label_desc: Use image node_id 7 for calling a global function with example usage: _open_f(args) and returns: _subproc_f, _shell_f, os, _subproc_f, _subproc_f