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Decorators are useful in Python for a variety of reasons. Some common uses are:

• caching
• logging
• timing
• authorization
• and lots more …

I mentioned in my recent SCALE10x talk that I would have a handout/cheatsheet for Python decorators. Here is a pdf version of the Decorator cheatsheet. It has templates for normal decorators and parameterized decorators. Enjoy!

edit — I apologize for the typos uploaded previously. I ran the handout through doctest and it should be good to go now.