# -*- coding: utf-8 -*-


def iter_items(items, interval):
    """

    :param items: 要遍历的集合
    :param interval: 每次遍历的元素的数量
    :return:
    """
    if interval < 1:
        return

    start = 0
    items_len = len(items)
    while True:
        if start >= items_len:
            break
        yield items[start:start + interval]
        start += interval