When we talk about function, it's typically a series of instruction which in a box and when you put variables in, it will return some certain result.

For example:

    def add(a, b):
        return a + b

It's the same thing as
, which get variables `a` and `b` and return `a + b`.

But in math, we call the `a + b` y.

毫不夸张地说，老师一直以来都欺骗了我们，把它变得非常神秘。 事实上，函数就是 a function. A function 就是一系列“代码”用来实现一个特定的任务。（比如计算平方、计算数的变化）

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