On Tue, 02 May 2006 12:58:14 -0700, Roger Miller wrote: > Steve R. Hastings wrote: > >> a = 0 >> b = 0 >> a is b # always true > > Is this guaranteed by the Python specification, or is it an artifact of > the current implementation?
I believe it's an artifact of the current implementation. And I only tested that on CPython; I don't know if it will work like that on Jython, IronPython, etc. I can't imagine why the Python spec would guarantee such a thing anyway. :-) > My understanding has been that an > implementation is free to share integer objects or not, so using 'is' > as an equality test takes you into undefined territory, regardless of > the size of the value. This sounds correct to me. (Note: I do not claim to be an authority on Python! But there are several authorities here who will no doubt correct this if I am wrong.) -- Steve R. Hastings "Vita est" [EMAIL PROTECTED] http://www.blarg.net/~steveha -- http://mail.python.org/mailman/listinfo/python-list
