# 闭包
origin = 0

def factory(pos):
	def go(step):
		nonlocal pos
		new_pos = pos + step
		pos = new_pos
		return new_pos
	return go

tourist = factory(origin)
print(tourist(2))

print(tourist.__closure__[0].cell_contents)
print(tourist(3))

print(tourist.__closure__[0].cell_contents)
print(tourist(5))
print(tourist.__closure__[0].cell_contents)
