text: from scanner import Scanner
  from parser import Parser
  
  test_str = "3 + 4 + 3 - 2 / 2"
  
  print(test_str)
  
  sc = Scanner(test_str)
  
  tokens, err = sc.generate_tokens()
  
  print(tokens)
  
  pr = Parser(tokens)
  ast = pr.parse()
  
  print(ast)
  
  