[] -> ()

conv list to tuple

def f():
	import marshal
	tuplis=[]
	def ltot(inpl):
		if id(inpl) in tuplis:
			return b"r"+tuplis.index(id(inpl)).to_bytes(4,"little")
		else:
			tuplis.append(id(inpl))
			ret=b"\xa9"+len(inpl).to_bytes(1,"little")
			for i in inpl:
				ret+=ltot(i)
			return ret
	def conv(inpl):
		tuplis.clear()
		return marshal.loads(ltot(inpl))
	return conv
conv=f()