Serhiy Storchaka added the comment:

PyList_GET_SIZE(list) is cheap (especially in comparison of 
_PyDict_GetItemId(), _PyDict_SetItemId() and PyList_New()), and its tiny 
overhead can be avoided at most once per thread's lifetime. I'm sure you can't 
measure the effect of this change.

If surrounding code be modified for other reasons, may be your change could be 
applied. But it alone just makes a code churn.

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nosy: +rhettinger, serhiy.storchaka

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<http://bugs.python.org/issue31187>
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