text: #!/usr/bin/env python
  
  from helper import helper_init
  
  scan_dir = helper_init(__file__, 'scan')
  from py2_scan import Python2Scanner
  
  scan = Python2Scanner()
  
  def showit(expr):
      print(expr)
      tokens = scan.tokenize(expr)
      for t in tokens: print(t)
      print('-' * 30)
      return
  
  for expr in (
  #     "(10.5 + 2 / 30) // 3 >> 1",
  #     """() { } + - 'abc' \"abc\" 10 10j 0x10 # foo
  # # bar
  # """,
      """
  if True:
     if False:
        del x
     assert True
  else:
     import os
     pass
      """,):
      showit(expr)
      pass
  