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Re: Hash stability

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Date Sat, 14 Jan 2012 23:45:59 +0100
From Heiko Wundram <modelnine@modelnine.org>
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Subject Re: Hash stability
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Am 14.01.2012 10:46, schrieb Peter Otten:
> Steven D'Aprano wrote:
>> How many people rely on hash(some_string) being stable across Python
>> versions? Does anyone have code that will be broken if the string hashing
>> algorithm changes?
>
> Nobody who understands the question ;)

Erm, not exactly true. There are actually some packages out there (take 
suds [https://fedorahosted.org/suds/], for example) that rely on the 
hashing algorithm to be stable to function "properly" (suds uses hash() 
of strings to create caches of objects/XML Schemas on the filesystem). 
This, in a different context, bit me at the end of last week, when 
required to use suds to access EWS.

I'd personally start debating the sensibility of this decision on the 
part of the suds developers, but... That's not the question. ;-)

-- 
--- Heiko.

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Thread

Hash stability Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-01-14 04:42 +0000
  Re: Hash stability Peter Otten <__peter__@web.de> - 2012-01-14 10:46 +0100
  Re: Hash stability Heiko Wundram <modelnine@modelnine.org> - 2012-01-14 23:45 +0100
  Re: Hash stability Chris Angelico <rosuav@gmail.com> - 2012-01-15 11:36 +1100
    Re: Hash stability Bryan <bryanjugglercryptographer@yahoo.com> - 2012-01-15 04:03 -0800
      Re: Hash stability Chris Angelico <rosuav@gmail.com> - 2012-01-15 23:21 +1100
  Re: Hash stability Roy Smith <roy@panix.com> - 2012-01-14 21:26 -0500
    Re: Hash stability Terry Reedy <tjreedy@udel.edu> - 2012-01-14 23:07 -0500
  Re: Hash stability Stefan Behnel <stefan_ml@behnel.de> - 2012-01-15 11:13 +0100
  Re: Hash stability Heiko Wundram <modelnine@modelnine.org> - 2012-01-15 12:46 +0100
  Re: Hash stability Peter Otten <__peter__@web.de> - 2012-01-15 13:22 +0100
  Re: Hash stability Heiko Wundram <modelnine@modelnine.org> - 2012-01-15 17:07 +0100
  Re: Hash stability Chris Angelico <rosuav@gmail.com> - 2012-01-16 03:13 +1100
  Re: Hash stability Heiko Wundram <modelnine@modelnine.org> - 2012-01-15 17:51 +0100
  Re: Hash stability Stefan Behnel <stefan_ml@behnel.de> - 2012-01-15 18:20 +0100
  Re: Hash stability Peter Otten <__peter__@web.de> - 2012-01-16 09:18 +0100
  Re: Hash stability Christian Heimes <lists@cheimes.de> - 2012-01-16 09:44 +0100
  Re: Hash stability Heiko Wundram <modelnine@modelnine.org> - 2012-01-16 10:15 +0100

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