As applications grow larger, it becomes increasingly important to modularize code by breaking it up into smaller functions of manageable size. You now have the tools you need to do this.

In this course, you’ve learned:

How to create a user-defined function in Python
Several different ways you can pass arguments to a function
How you can return data from a function to its caller
How to add documentation to functions with docstrings and annotations

For more information about topics covered in this lesson, you can check out these resources:

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Congratulations, you made it to the end of the course! What’s your #1 takeaway or favorite thing you learned? How are you going to put your newfound skills to use? Leave a comment in the discussion section and let us know.

00:00 I hope you’ve enjoyed this course on how to write your own Python functions. Let’s look back at what we’ve done. As applications grow larger, it becomes increasingly important to modularize code by breaking it up into smaller functions of manageable size. Functions provide a means to do all that.

00:20 Functions allow for code to be reused, and parameters allow each invocation to be specialized from one call to the next. Using a function requires knowing its interface, which is the function name, any parameter values that it needs, and what value or values it returns.

00:39 You have learned how to create a user-defined function in Python. You’ve learned many ways that you can pass arguments to a function. Python provides a lot of flexibility for that, and we’ve spent a lot of lessons on the different means of passing arguments to a function.

01:01 We also saw how you can return data from a function to the place where it was called. And we learned how to use docstrings and annotations to provide documentation on how a function is to be used. Where can you go from here?

01:17 Well, there are tutorials and courses on the Python return statement, usage and best practices. There’s more information on pass-by-reference in Python, background and best practices, and also args and kwargs demystified.

01:36 I hope you have enjoyed this course, and I look forward to joining you for another one.