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Showing content from http://mail.python.org/pipermail/python-dev/2004-March/043198.html below:

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

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At 07:46 PM 3/17/04 -0500, Andrew Koenig wrote:
>My own concern is that if someone writes expressions such as "x is 0" by
>mistake, the resulting program might always work on one implementation but
>fail on another.

In theory, the compiler could consider it an error for an 'is' expression 
to have a constant on either side.  That would be preferable to redefining 
'is'.

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