code: def main():
      """This is where the example starts and the FSM state transitions are
      defined. Note that states are strings (such as 'INIT'). This is not
      necessary, but it makes the example easier to read."""
  
      f = FSM("INIT", [])
      f.set_default_transition(Error, "INIT")
      f.add_transition_any("INIT", None, "INIT")
      f.add_transition("=", "INIT", DoEqual, "INIT")
      f.add_transition_list(
          string.digits, "INIT", BeginBuildNumber, "BUILDING_NUMBER"
      )
      f.add_transition_list(
          string.digits,
          "BUILDING_NUMBER",
          BuildNumber,
          "BUILDING_NUMBER",
      )
      f.add_transition_list(
          string.whitespace, "BUILDING_NUMBER", EndBuildNumber, "INIT"
      )
      f.add_transition_list("+-*/", "INIT", DoOperator, "INIT")
  
      print()
      print("Enter an RPN Expression.")
      print("Numbers may be integers. Operators are * / + -")
      print("Use the = sign to evaluate and print the expression.")
      print("For example: ")
      print("    167 3 2 2 * * * 1 - =")
      inputstr = (input if PY3 else raw_input)("> ")  # analysis:ignore
      f.process_list(inputstr)
  
imports: import sys
  import string
label_desc: Use image node_id 7 for calling a global function with example usage: main() without return types