docstr: Prints an item id behind the tracking object.
docstr_tok: ["Prints","an","item","id","behind","the","tracking","object","."]
code: def _cache_item_id(self):
      """Prints an item id behind the tracking object."""
      self._cached_output += " | Item ID: %s" % self.item_id
  
imports: import os
  import sys
  import time
  from io import UnsupportedOperation
label_desc: Use image node_id 13 for calling the Prog obj's underlying member method code with example usage: obj._cache_item_id() without return types