old_contents: from pprint import pprint
  import sys
  
  import parser
  rules = parser.parse_file(open(sys.argv[1]))
  print(rules)
  
  
new_contents: import sys
  
  import parser
  rules = parser.parse_file(open(sys.argv[1]))
  print(rules)
  
subject: remove pprint since we don't use it anymore