Pablo Galindo Salgado <pablog...@gmail.com> added the comment: @serhiy.storchaka @rhettinger @vstinner Should we better make the pre-allocation if the length of the iterable is known (so we call PyObject_Length and not PyObject_LengthHint)? This will keep the logic simpler (so not shrinking if PyObject_LengthHint gives more than the real length) and it will not be as expensive as calling PyObject_LengthHint.
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