In this chapter, finally we explored the world of functions. They are extremely important and, from now on, we'll use them basically everywhere. We talked about the main reasons for using them, the most important of which are code reuse and implementation hiding.

We saw that a function object is like a box that takes optional input and produces output. We can feed input values to a function in many different ways, using positional and keyword arguments, and using variable syntax for both types.

Now you should know how to write a function, how to document it, import it into your code, and call it.

The next chapter will force me to push my foot down on the throttle even more so I suggest you take any opportunity you get to consolidate and enrich the knowledge you've gathered until now by putting your nose into the Python official documentation.

Ready for the cool stuff? Let's go!