code: def waitForPaste(timeout=None):
      """This function call blocks until a non-empty text string exists on the
      clipboard. It returns this text.
  
      This function raises PyperclipTimeoutException if timeout was set to
      a number of seconds that has elapsed without non-empty text being put on
      the clipboard."""
      startTime = time.time()
      while True:
          clipboardText = paste()
          if clipboardText != "":
              return clipboardText
          time.sleep(0.01)
  
          if timeout is not None and time.time() > startTime + timeout:
              raise PyperclipTimeoutException(
                  "waitForPaste() timed out after "
                  + str(timeout)
                  + " seconds."
              )
  
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 18 for calling a global function with example usage: waitForPaste(timeout) and returns: clipboardText