old_contents: from parser import Parser, Scanner
  from model import Scope
  from printer import PrettyPrinter
  
  if __name__ == "__main__":
      import sys
      for filename in sys.argv[1:]:
          program = Parser().parse(Scanner(filename), False)
          for stmt in program:
              PrettyPrinter().visit(stmt)
  
new_contents: from parser import Parser, Scanner
  from model import Scope
  from printer import PrettyPrinter
  
  if __name__ == "__main__":
      import sys
      for filename in sys.argv[1:]:
          program = Parser().parse(Scanner(filename), False)
          printer = PrettyPrinter()
          for stmt in program:
              printer.visit(stmt)
  
subject: fix format