Raymond Hettinger <raymond.hettin...@gmail.com> added the comment:

I think the thing we can fix is the automatic set support which is 
intrinsically broken with respect to reproducibility and which was likely not a 
good idea to begin with (because it adds an implicit and possibly unexpected 
O(n) conversion step and because it doesn't make the API for choice()).

If someone converts a set to a list or tuple upstream from sample(), there 
isn't much we can do about it.   That wouldn't be much different from 
list(s)[0] giving different output from run to run.  That is a general FAQ and 
would apply to just about anything that takes a sequence or iterator to run.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue40325>
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