new_contents: 
  f = open("README.md")
  for line in f:
      print(line)
  # oops didnt close it ...
  print('Next line : %s' % f.read())
  
  print()
  
  with open("README.md") as f2:
      for line in f2:
          print(line)
  
  # automatically close by context manager once the code exits the with block
  
  f2.read()
  
subject: add example code for open