code: def DoOperator(fsm):
      ar = fsm.memory.pop()
      al = fsm.memory.pop()
      if fsm.input_symbol == "+":
          fsm.memory.append(al + ar)
      elif fsm.input_symbol == "-":
          fsm.memory.append(al - ar)
      elif fsm.input_symbol == "*":
          fsm.memory.append(al * ar)
      elif fsm.input_symbol == "/":
          fsm.memory.append(al / ar)
  
imports: import sys
  import string
label_desc: Use image node_id 4 for calling a global function with example usage: DoOperator(fsm) without return types