old_contents: import sys
  
  if __name__ == '__main__':
  	print(sum(map(float, sys.argv[1:])))
  
  
new_contents: import sys
  
  def add_all()
  
  
  if __name__ == '__main__':
  	command =sys.argv[1]
  	nums=sys.argv[2:]
  	if command=='add':
  		print add_all(nums)
  
  
subject: Add command structure