code: def set_clipboard(clipboard):
      """
      Explicitly sets the clipboard mechanism. The "clipboard mechanism" is how
      the copy() and paste() functions interact with the operating system to
      implement the copy/paste feature. The clipboard parameter must be one of:
          - pbcopy
          - pyobjc (default on macOS)
          - qt
          - xclip
          - xsel
          - klipper
          - windows (default on Windows)
          - no (this is what is set when no clipboard mechanism can be found)
      """
      global copy, paste
  
      clipboard_types = {
          "pbcopy": init_osx_pbcopy_clipboard,
          "pyobjc": init_osx_pyobjc_clipboard,
          "qt": init_qt_clipboard,  # TODO - split this into 'qtpy', 'pyqt4', and 'pyqt5'
          "xclip": init_xclip_clipboard,
          "xsel": init_xsel_clipboard,
          "wl-clipboard": init_wl_clipboard,
          "klipper": init_klipper_clipboard,
          "windows": init_windows_clipboard,
          "no": init_no_clipboard,
      }
  
      if clipboard not in clipboard_types:
          allowed_clipboard_types = [repr(_) for _ in clipboard_types]
          raise ValueError(
              f"Argument must be one of {', '.join(allowed_clipboard_types)}"
          )
  
      # Sets pyperclip's copy() and paste() functions:
      copy, paste = clipboard_types[clipboard]()
  
imports: import contextlib
  import ctypes
  from ctypes import c_size_t, c_wchar, c_wchar_p, get_errno, sizeof
  import os
  import platform
  from shutil import which
  import subprocess
  import time
  import warnings
  from pandas.errors import PyperclipException, PyperclipWindowsException
  from pandas.util._exceptions import find_stack_level
label_desc: Use image node_id 14 for calling a global function with example usage: set_clipboard(clipboard) without return types