On Fri, Aug 10, 2012 at 8:56 PM, Dave Angel <d...@davea.name> wrote: >> On Fri, Aug 10, 2012 at 8:07 PM, Dave Angel <d...@davea.name> wrote: >>> But if you said c=651 and d=651, you'd have two >>> objects, and the two names would be bound to different objects, with >>> different ids. >> To be more accurate, you *may* have two different objects. It's >> possible for things to be optimized (eg with small numbers, or with >> constants compiled at the same time). > > You're right, of course. But I picked the value of 650+ deliberately, > as I believe CPython doesn't currently optimize ints over 256.
Yep. Also: >>> a=651; b=651 >>> a is b True >>> a=651 >>> a is b False Same thing occurs (or at least, appears to) with constants in the same module. Could potentially be a fairly hefty optimization, if you use the same numbers all the time (bit flags, scale factors, modulo divisors, etc, etc, etc). Still doesn't alter your fundamental point of course. ChrisA -- http://mail.python.org/mailman/listinfo/python-list
