On 4/21/2012 9:02 AM, Bernd Nawothnig wrote:
You should better not rely on that result. I would consider it to be
an implementation detail. I may be wrong, but would an implementation
that results in
() is () ==> False
be correct or is the result True really demanded by the language
specification?
To make sure that the result is not due to ref counting garbage
collection in the middle of the expression, one must test like so:
>>> a=()
>>> b=()
>>> a is b
True
This is explicitly an implementation detail, something that *may* be
done. I am not sure if the above has always been the case for CPython.
CPython's set of pre-built ints has been expended. I think string
interning has also changed.
--
Terry Jan Reedy
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