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Sun Jul 15 16:08:41 CEST 2012 · https://mail.python.org/pipermail/python-dev/2012-July/120935.html

Right, I agree on the value in being able to return something to say "this
cannot be converted to a concrete container".

I still haven't seen a use case where the appropriate response to "I don't
know" differs from the appropriate response to a hint of zero - that is,
you don't preallocate, you just start iterating.

Cheers,
Nick.

--
Sent from my phone, thus the relative brevity :)
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[Python-Dev] PEP 0424: A method for exposing a length hint