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# 4.3.   列表（List）
# 4.3.   列表
**由于长度不可变，数组的实用性大大降低**。在很多情况下，我们事先并不知道会输入多少数据，这就为数组长度的选择带来了很大困难。长度选小了，需要在添加数据中频繁地扩容数组；长度选大了，又造成内存空间的浪费。