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Wed Mar 17 19:38:33 EST 2004 · http://mail.python.org/pipermail/python-dev/2004-March/043188.html

> I'm not sure what the use case for the recursive "is" is, but it would be
> no cheaper than "==" in that case.  I'm disinclined to change things.

I can understand why you might be disinclined, but I do see why recursive
"is" might be cheaper.  The simplest case is probably comparing two
2-element tuples, where the elements are arbitrary objects.  == might not
even be defined on those objects, but "is" would be.

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Showing content from http://mail.python.org/pipermail/python-dev/2004-March/043188.html below:

[Python-Dev] A proposal has surfaced on comp.lang.python toredefine "is"