old_contents: cast=["Cleese","Palin","Jones","Idle"]
  print(cast)
  cast.pop()
  print(cast)
  cast.extend(["Gillan","Chanpman"])
  print(cast)
new_contents: #test code
  cast=["Cleese","Palin","Jones","Idle"]
  print(cast)
  cast.pop()
  print(cast)
  cast.extend(["Gillan","Chanpman"])
  print(cast)
subject: Add modify code Google News Crawer