# Write Your invest() Function

**00:00**
Now let’s tackle the `invest()`

function part. We need a function named `invest()`

with three parameters.

**00:09**
So for now, let’s not focus so much on the content of the function, but the function definition. Underneath this comment, you can write `def`

, `invest(amount, rate, years):`

Next line, you can just add a `pass`

because we’ll tackle this in a moment.

**00:31**
And of course, it should be `invest`

, not `investe`

as the function name. And that’s basically that part of the challenge done as well.

**00:40**
We wrote a function called `invest()`

with three parameters: the principal amount, yearly rate, and the amount of years.

**00:47**
By adding `pass`

in the function body, then the function basically does nothing. But I really like to boil down different parts of a bigger challenge into smaller bits.

**00:59**
So with this, you now have the function, and the next part can be to add in the content to the function body.

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