Stefan Behnel added the comment:

I agree with basically all counter-arguments that were brought up so far. While 
I would eventually like to use the available length hints in the special case 
of Cython's list comprehensions, I'm far from seeing a general applicability 
for this. The use cases are fairly limited, the (missing) guarantees are easy 
to misunderstand by users and alternatives exist for most use cases. Python 
code shouldn't be bothered with memory management.

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nosy: +scoder

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<http://bugs.python.org/issue17338>
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