code: def delete(self, lookup):
  		
  		lookup, num = self.split_num(lookup)
  		if num:
  			result = self.find_matches(lookup)[num - 1]
  		else:
  			result, = self.find_matches(lookup)
  		self.db.delete_one(result)
docs: If exactly one quote matches, delete it. Otherwise,
  		raise a ValueError.