[issue13349] Uninformal error message in index() and remove() functions

[Petri Lehtinen]

Changes by Petri Lehtinen <petri at digip.org>:


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components: +Extension Modules, Interpreter Core
type:  -> behavior
versions: +Python 3.3

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue13349>
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