Post

That moment when you accidentally use a dict instead of an array and end up with random iteration order. Although supposedly it shouldn't happen on newer Python versions?

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Trey Hunner

@trey.io

10 Oct 2025

Not just on newer versions, but all supported versions since Python 2.7 and 3.5 were end-of-life'd in 2020. If f-strings are valid Python syntax, dictionaries are ordered.

Pushkar S

@semaphores.dev

Hmm, maybe the insertion is random then? This is what I get with a dict: gist.github.com/psncl/43dbef... When I use a list instead, the order is [22, 15, 8, 1] every time.

10/10/25, 6:34 am0 reposts0 likes

Pushkar S

@semaphores.dev

10 Oct 2025

Nevermind, figured it out in another reply.