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Showing content from http://mail.python.org/pipermail/python-dev/2005-August/055497.html below:

[Python-Dev] Deprecating builtin id (and moving it to sys())

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On 8/17/05, Anthony Baxter <anthony at interlink.com.au> wrote:
> If you _really_ want to call a local variable 'id' you can (but shouldn't).

Disagreed. The built-in namespace is searched last for a reason -- the
design is such that if you don't care for a particular built-in you
don't need to know about it.

> You also can't/shouldn't call a variable 'class', 'def', or 'len' -- but I
> don't see any movement to allow these...

Please don't propagate the confusion between reserved keywords and
built-in names!

-- 
--Guido van Rossum (home page: http://www.python.org/~guido/)

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