code: def terminal_unreserve(progress_obj, terminal_obj=None, verbose=0, identifier=None):
      
  
      if terminal_obj is None:
          terminal_obj = sys.stdout
  
      if identifier is None:
          identifier = ''
      else:
          identifier = identifier + ': '
  
      po = TERMINAL_RESERVATION.get(terminal_obj)
      if po is None:
          log.debug("terminal %s was not reserved, nothing happens", terminal_obj)
      else:
          if po is progress_obj:
              log.debug("terminal %s now unreserned", terminal_obj)
              del TERMINAL_RESERVATION[terminal_obj]
          else:
              log.debug("you %s can NOT unreserve terminal %s be cause it was reserved by %s", progress_obj, terminal_obj,
                        po)
docs: Unregisters the terminal (stdout) for printing.
  
      an instance (progress_obj) can only unreserve the tty (terminal_obj) when it also reserved it
  
      see terminal_reserved for more information
  
      Returns
      -------
      None