def index(self, value, start=0, end=None):
		"""Return the index of value between start and end.

		By default, the entire setlist is searched.

		This runs in O(1)

		Args:
			value: The value to find the index of
			start (int): The index to start searching at (defaults to 0)
			end (int): The index to stop searching at (defaults to the end of the list)
		Returns:
			int: The index of the value
		Raises:
			ValueError: If the value is not in the list or outside of start - end
			IndexError: If start or end are out of range
		"""
		try:
			index = self._dict[value]
		except KeyError:
			raise ValueError
		else:
			start = self._fix_neg_index(start)
			end = self._fix_end_index(end)
			if start <= index and index < end:
				return index
			else:
				raise ValueError