# 推导式 Comprehension

推导式（又称解析式）是 Python 的一种独有特性，如果我被迫离开了它，我会非常想念。推导式是可以从一个数据序列构建另一个新的数据序列的结构体。共有三种推导，在Python 2和3中都有支持：

* 列表（`list`）推导式
* 字典（`dict`）推导式
* 集合（`set`）推导式

我们将一一进行讨论。一旦你知道了使用列表推导式的诀窍，你就能轻易使用任意一种推导式了。


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