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Written by Paul van der Laan on 2025-01-15 at 08:10

[#]Python question: since dictionaries are ordered in Python 3 now, are there any reasons to still use OrderedDicts? I'm updating some old code that was written in Python 2 originally.

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Written by Just van Rossum on 2025-01-15 at 08:35

@paulvanderlaan if “preserve insertion order” is good enough, then there’s no reason to use an OrderedDict.

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Written by Paul van der Laan on 2025-01-15 at 09:17

@justvanrossum I figured as much. Thanks.

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Written by Alexandre B A Villares 🐍 on 2025-01-16 at 09:43

@paulvanderlaan and what @justvanrossum 's reply implies is that if you need more stuff like efficiency in dealing with ordering, it still has more features, like..move_last() not available on common dicts. https://docs.python.org/3/library/collections.html#collections.OrderedDict

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Written by C. on 2025-01-15 at 23:26

@paulvanderlaan

Nope, they're just there for backward compatibility. Convert away!

[#]legacy

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Written by Alexandre B A Villares 🐍 on 2025-01-16 at 09:44

@cazabon @paulvanderlaan not really, they still have more stuff... https://docs.python.org/3/library/collections.html#collections.OrderedDict

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