[New-bugs-announce] [issue42368] Make set ordered

[Dan Gheorghe Haiduc]

New submission from Dan Gheorghe Haiduc <danuthaiduc at gmail.com>:

Now that dicts are ordered[1], would it by any chance make sense to also order sets?

A use case that I ran into is trying to reproducibly get a random.choice from a set (after calling random.seed). 

At first I did not need reproducibility, and I just called random.choice(list(my_set)). 

Later when I did need it, it was difficult to find out what was wrong. Then I realized that sets are unordered, and that order is not dependent on random.seed.

It seems there are also some other confused newbies out there.[2][3]

Thank you for the powerful language that is Python!

[1] https://www.python.org/dev/peps/pep-0468
[2] https://stackoverflow.com/q/11929701/235463
[3] https://stackoverflow.com/q/36317520/235463

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components: Interpreter Core
messages: 381088
nosy: danuker
priority: normal
severity: normal
status: open
title: Make set ordered
type: enhancement

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue42368>
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