docstr: Return *True* if the symbol is used in
  its block.
docstr_tok: ["Return","*","True","*","if","the","symbol","is","used","in","its","block","."]
code: def is_referenced(self):
      """Return *True* if the symbol is used in
      its block.
      """
      return bool(self.__flags & _symtable.USE)
  
imports: import _symtable
  from _symtable import USE, DEF_GLOBAL, DEF_NONLOCAL, DEF_LOCAL, DEF_PARAM, DEF_IMPORT, DEF_BOUND, DEF_ANNOT, SCOPE_OFF, SCOPE_MASK, FREE, LOCAL, GLOBAL_IMPLICIT, GLOBAL_EXPLICIT, CELL
  import weakref
label_desc: Use image node_id 4 for calling the Symbol obj's underlying member method code with example usage: obj.is_referenced() and returns: bool