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  3. Writing Functions in Python
  • 1

    Best Practices

    Free

    The goal of this course is to transform you into a Python expert, and so the first chapter starts off with best practices when writing functions. You'll cover docstrings and why they matter and how to know when you need to turn a chunk of code into a function. You will also learn the details of how Python passes arguments to functions, as well as some common gotchas that can cause debugging headaches when calling functions.

  • 2

    Context Managers

    If you've ever seen the "with" keyword in Python and wondered what its deal was, then this is the chapter for you! Context managers are a convenient way to provide connections in Python and guarantee that those connections get cleaned up when you are done using them. This chapter will show you how to use context managers, as well as how to write your own.

  • 3

    Decorators

    Decorators are an extremely powerful concept in Python. They allow you to modify the behavior of a function without changing the code of the function itself. This chapter will lay the foundational concepts needed to thoroughly understand decorators (functions as objects, scope, and closures), and give you a good introduction into how decorators are used and defined. This deep dive into Python internals will set you up to be a superstar Pythonista.

  • 4

    More on Decorators

    Now that you understand how decorators work under the hood, this chapter gives you a bunch of real-world examples of when and how you would write decorators in your own code. You will also learn advanced decorator concepts like how to preserve the metadata of your decorated functions and how to write decorators that take arguments.

Initializing

Exercise

Using decorator syntax

You have written a decorator called print_args that prints out all of the arguments and their values any time a function that it is decorating gets called.

Instructions 1/2

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  • 1

    Decorate my_function() with the print_args() decorator by redefining the my_function variable.

  • 2

    Decorate my_function() with the print_args() decorator using decorator syntax.