def _recur_list(rlist):
	"""
	>>> _recur_list([[1,2,3],4,[5,6,[7,8,9,[10]]]])
	>>> [1,2,3,4,5,6,7,8,9,10]
	"""
	out = []
	for i in rlist:
		if isinstance(i,list):
			out += _recur_list(i)
		else:
			out.append(i)
	return out