[Python-Dev] iter.index() (original) (raw)

'Christian Stork' python-dev-list at cstork.org
Sun Apr 18 23:12:47 EDT 2004

On Sun, Apr 18, 2004 at 10:37:28PM -0400, Raymond Hettinger wrote:

[Christian Stork] > I wanted to do something like > > i = itertools.chain(list1, list2).index(elem)

I'm curious about what application needed to do this.

It's for a simulation of a peer-to-peer algorithm I'm working on. The lists are lists of peers and could potentially become very large. Therefore concatenation might not be cheap.

> If I use the operator module it works just fine. > > i = operator.indexOf(itertools.chain(list1, list2), elem)

Nice solution. It is general purpose, self-documenting, and efficient.

Thanks. :-)

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