this post was submitted on 29 Aug 2023

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Python

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The Python dictionary dispatch pattern (jamesg.blog)

submitted 1 year ago by PythOnRails to c/python

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[–] [email protected] 6 points 1 year ago (2 children)

To be honest, for me it looks as very strange pattern.. If one wants to have static container with functions, there is Enums or classes.

[–] Walnut356 2 points 1 year ago

It's most useful when you're using some data you already have as the dictionary key. A usecase i had for this was a binary file parser with 10 types of event markers. It was originally coded with if/elif, but performance was a pretty big consideration. Using the event markers as keys to a dictionary dispatch improved performance by about 15% and made the code significantly more readable.

[–] [email protected] 1 points 1 year ago

With classes you needs getattr in python to achieve the same. This is cleaner for simple mappings