On Sun, Jan 15, 2012 at 8:46 AM, Stefan Behnel <stefan...@behnel.de> wrote: > > It also seems to me that the wording "has a hash value which never changes > during its lifetime" makes it pretty clear that the lifetime of the hash > value is not guaranteed to supersede the lifetime of the object (although > that's a rather muddy definition - memory lifetime? or pickle-unpickle as > well?). >
Lifetime to me means of that specific instance of the object. I would not expect that to survive pickle-unpickle. > However, this entry in the glossary only seems to have appeared with Py2.6, > likely as a result of the abc changes. So it won't help in defending a > change to the hash function. > Ugh, I really hope there is no code out there depending on the hash function being the same across a pickle and unpickle boundary. Unfortunately the hash function was last changed in 1996 in http://hg.python.org/cpython/rev/839f72610ae1 so it is possible someone somewhere has written code blindly assuming that non-guarantee is true. -gps
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