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Decorators 101 Recap and Review

Python Decorators 101 Christopher Bailey 01:14

Congratulations on getting this far. This video is a recap and review of this section. You’ve covered a couple of useful real world examples such as:

Boilerplate template for creating decorators that you can reuse
How to time functions
Using a decorator to build a debugging tool
Slow down code if you need to
Making a light-weight plugin architecture to register plugins

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00:00 Hey! Congratulations on a job well done. You completed Decorators 101. Briefly, I’d like to review Section 3 with you. Section 3 was all about real-world examples, and you created a boilerplate template that you could reuse for the rest of the examples.

00:20 Next, you learned how you could time functions using a decorator.

00:28 Then you created a tool for debugging code that showed you the arguments coming in and out of functions.

00:39 You also learned how you could debug the use of convenience functions by wrapping a decorator around them. Next, if you needed to, you found a way that you could slow down code simply by adding a decorator, and added that to your tool belt.

00:58 And finally, you learned how to make a lightweight plugin architecture to register functions so that you can pull them out and reuse them later. Thanks again for joining me for this tour through Decorators 101.

Sammy-Boy on Aug. 29, 2020

It’s super great tutorial. Just one question though what does this !r do in the f-strings? Maybe I missed it on a certain video.

Geir Arne Hjelle RP Team on Aug. 29, 2020

Hi Sammy-Boy.

The !r format specifier means that repr() should be used instead of the default str() when converting the variable.

For string variables it will in practice add single quotes around the string.

Ghani on Oct. 23, 2020

Very informative course; thanks!

Pavel Anni on Jan. 10, 2021

Great tutorial, thanks! Time to think about how to apply it to my current projects :-)

rumeeahmad on Jan. 24, 2021

This is a very in depth and well explained view of decorators. This course has been fleshed out well and examples and use cases are relavent thus making it very simple for begginers to grasp their heads around.

My only reccomedation is to make sure some of the more obscure items are always explained a litle bit more in depth e.g. repr or !r.

Thanks

Mario Henrique Adaniya on Feb. 20, 2021

I’m struggling a little bit in a code that make heavy usage of decorators. The course helped me to understand a little bit more about decorators… but still have tons of doubts.

7ssanM on Oct. 16, 2021

Wonderful summary, easy to grasp, thank you very much Christopher and Real Python team.

aniketbarphe on Nov. 26, 2021

Thank You!

sndselecta on Jan. 7, 2024

Just to better understand. Decorators are basically something referred to as “wrapper functions”. It works as function itself, where a pre-definded function is input as an argument. The object of this wrapper function is to use the inputed function as is without altering its original code, with the additional advantage of imbedding new code before or after and ultimately returning the aggregated output.

Ash D on Jan. 9, 2024

Incredible course - very well thought out and designed. The best RealPython course I’ve done so far (and I’ve done quite a lot!)

The best thing about this course is how much groundwork the teacher laid first, to avoid blowing our brains up when explaining decorators, a topic which most people find quite hard to grasp.

The design of this course shows a huge amount of thought about which aspects of decorators are the sticking point for most newbies, and how convey understanding about the precursor elements that make decorators easier to understand.

I was pleasantly surprised at how relevant and useful the examples were. I liked that the text-entry screen caps are sped up so that we’re not sitting there watching someone type slowly.

Fantastic work, RP team!

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