new_contents: # This program converts a list to a comma separated string
  #
  # Write a function that takes a list value as an argument and returns a string
  # with all the items separated by a comma and a space, with and inserted before
  # the last item.
  #
  # Say you have a list value like this:
  # spam = ['apples', 'bananas', 'tofu', 'cats']
  # For example, passing the previous spam list to the function would return
  # 'apples, bananas, tofu, and cats'. But your function should be able to work
  # with any list value passed to it.
  
subject: Initialize P01_comma_code