old_contents: import click
  
  import solve
  import data
  import ReferenceModel
  
  @click.group()
  def cli():
      pass
  
  @cli.command()
  @click.option('--folder', type=click.Path())
  @click.option('--quantity', type=click.Path())
  @click.option('--price', type=click.Path())
  @click.option('--shipping', type=click.Path())
  def main(**kwargs):
      if kwargs['folder']:
          quantity, price, shipping = data.get_input(kwargs['folder'])
      elif kwargs['quantity'] and kwargs['price'] and kwargs['shipping']:
          quantity = data.get_quantity(kwargs['quantity'])
          price = data.get_price(kwargs['price'])
          shipping = data.get_shipping(kwargs['shipping'])
      else:
          raise click.UsageError("foo requires either a path to a folder or paths to ALL input files. Check the documentation for how to use foo.")
  
      model = ReferenceModel.create_model(price, quantity, shipping)
  
      solve.display(solve.solve(model))
  
  if __name__ == '__main__':
      main()
  
new_contents: #! /usr/bin/env python
  
  import click
  
  import solve
  import data
  import ReferenceModel
  
  @click.group()
  def cli():
      pass
  
  @cli.command()
  @click.option('--folder', type=click.Path())
  @click.option('--quantity', type=click.Path())
  @click.option('--price', type=click.Path())
  @click.option('--shipping', type=click.Path())
  def main(**kwargs):
      if kwargs['folder']:
          quantity, price, shipping = data.get_input(kwargs['folder'])
      elif kwargs['quantity'] and kwargs['price'] and kwargs['shipping']:
          quantity = data.get_quantity(kwargs['quantity'])
          price = data.get_price(kwargs['price'])
          shipping = data.get_shipping(kwargs['shipping'])
      else:
          raise click.UsageError("foo requires either a path to a folder or paths to ALL input files. Check the documentation for how to use foo.")
  
      model = ReferenceModel.create_model(price, quantity, shipping)
  
      solve.display(solve.solve(model))
  
  if __name__ == '__main__':
      main()
  
subject: Make run.py executable