text: import exptermscanner
  import exptermparser
  import sys
  
  
  def main():
      
      if (len(sys.argv)) != 2:
          print("usage: expterm filename")
          print("   expterm will interpret/compile the expression in the file named")
          print("   filename and print its result to standard output")
          return
      
      strm = open(sys.argv[1],"r")
      theScanner = exptermscanner.exptermScanner(strm)
      theParser = exptermparser.exptermParser()
      
      ast = theParser.parse(theScanner)
      print(ast)
      
  if __name__ == "__main__":
      main()
  