[Python-Dev] Hashing proposal: change only string-only dicts

Barry Warsaw barry at python.org
Wed Jan 18 13:30:10 CET 2012

On Jan 18, 2012, at 08:19 AM, Martin v. Löwis wrote:

>My concern is not about breaking doctests: this proposal will also break
>them. My concern is about applications that assume that hash(s) is
>stable across runs, and we do have reports that it will break

I am a proponent of doctests, and thus use them heavily.  I can tell you that
the issue of dict hashing (non-)order has been well known for *years* and I
have convenience functions in my own doctests to sort and print dict
elements.  Back in my Launchpad days (which has oodles of doctests), many
years ago we went on a tear to fix dict printing when some change in Python
caused them to break.  So I'm not personally worried that such a change would
break any of my own code.

Even though I hope anybody who uses doctests has their own workarounds for
this, I still support being conservative in default behavior for stable
releases, because it's the right thing to do for our users.


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