[Python-Dev] builtin_id() returns negative numbers
tim.peters at gmail.com
Thu Feb 17 19:44:11 CET 2005
>> # This is a puzzle: there's no way to know the natural width of
>> # addresses on this box (in particular, there's no necessary
>> # relation to sys.maxint).
> Isn't this natural width nowadays available as:
> 256 ** struct.calcsize('P')
Looks right to me -- cool! I never used struct's 'P' format because
it always appeared useless to me: even if I could ship pointers
across processes or boxes, there's not much I could do with them after
getting integers back from unpack(). But silly me! I'm sure Guido
put it there anticipating the need for calcsize('P') when making a
positive_id() function in Python.
Now if you'll just sign and fax a Zope contributor agreement, I'll
upgrade ZODB to use this slick trick <wink>.
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