new_contents: #!/usr/bin/env python
  
  import argparse
  import lib
  
  if __name__ == "__main__":
      parser = argparse.ArgumentParser(description='Set up testing environment.')
      parser.add_argument('version', help='PostgreSQL version')
      args = parser.parse_args()
  
      version = args.version
      dc = lambda *args: lib.docker_compose(version, *args)
  
      print('Stopping testing environment for PostgreSQL {version}...'.format(version=version))
  
      dc('down')
  
      print('Testing environment stopped')
  
subject: Rewrite tear-down