[Python-Dev] Pie-thon benchmark code ready (original) (raw)

Guido van Rossum guido at python.org
Thu Jan 1 20:45:07 EST 2004

At 14:52 01.01.2004 -0500, Tim Peters wrote: >IOW, CPython is enduring some pain to try to make this consistent too; it's >not only Jython that can't get a free ride here.

[Samuele]

is not about having a free ride, it's just that printing the id(.) in Jython as a 'at 0x' is misleading because id(.) now is different from System.identityHashCode which is what goes into the java cls@ repr.

I don't care either way. The importance of having some number here is that for ordinary objects, if you print two different ones, the repr() will show you that they are different, and if you print the same one twice, repr() will show that too. I don't recall ever having taken the id() of an object or the address from a repr() and looked it up in memory using a debugger.

OTOH if there's a way to get the Java runtime to print things like @ it might make sense to get Python's runtime to print the same number after 'at'; in general giving developers a warm fuzzy feeling of comfort through familiarity is good if it doesn't interfere with other goals.

So I'd be happy if we could standardize on 'at 0x...' at least for all objects where CPython currently uses that, letting implementations choose what to put after the 0x, as long as it's hex digits.

We can discuss what's the best repr() for new-style classes going forward; since the module is included in the repr I'm less concerned about having the address in there (multiple classes with the same name are an anomaly, while multiple instances with the same class are normal).

--Guido van Rossum (home page: http://www.python.org/~guido/)

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