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Thu Mar 13 02:26:31 CET 2008 · https://mail.python.org/pipermail/python-dev/2008-March/077571.html

"Joost Behrends" <webmaster at h-labahn.de> wrote in message 
news:20080313010923.d1bc7ee9.webmaster at h-labahn.de...
| With such a tuple tp i tried 'ix = tp.index(...)' recently and was
| astonished to learn, that this doesn't work. Since we have '... in tp'
| for me it seems, that it should make very little difference in
| the interpreter's code, if .index() would be a method of any sequence,
| mutable or not. Such a small difference, that this minor change wouldn't
| deserve a PEP.

I believe .index() is part of the 3.0 sequence protocol and hence has been 
added to tuples for 3.0.  Don't know if has been or will be backported to 
2.6. 

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[Python-Dev] Why .index() is not a method of all sequence types ?