如何返回此方法的下一个for循环项？

def next_item():
    items = ['item1', 'item2', 'item3']
    for item in items:
        yield item

# 创建生成器对象
generator = next_item()

# 调用生成器的next()方法来获取下一个for循环项
next_item = next(generator)
print(next_item)  # 输出：item1

next_item = next(generator)
print(next_item)  # 输出：item2

next_item = next(generator)
print(next_item)  # 输出：item3