[EMAIL PROTECTED] wrote:
On Jun 20, 9:38 am, Jean-Paul Calderone <[EMAIL PROTECTED]> wrote:
On Fri, 20 Jun 2008 09:31:57 -0700 (PDT), [EMAIL PROTECTED] wrote:
I am not certain why this is the case, but...
a = 256
b = 256
a is b
True
a = 257
b = 257
a is b
False
Can anyone explain this further? Why does it happen? 8-bit integer
differences?
http://mail.python.org/pipermail/python-list/2001-November/113994.html
Jean-Paul
Thank you for this Jean-Paul. I did know about the identity of
objects, but my curiosity is based on the 256 number. Are the 2^8
integers cached due to the internal loops, or is there any other
specific reason? Is this something that can be controlled?
Python provides no way to change that number, but of course you can
always fiddle with the source code and recompile. The actual value is
a trade off (like any caching scheme) of cache-space versus efficiency
gains. The value has changed at least once in recent versions of Python.
Gary Herron
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