[issue19369] PyObject_LengthHint is slow

[Antoine Pitrou]

Antoine Pitrou added the comment:

Here is a patch. Micro-benchmark:

$ ./python -m timeit -s "l=[]; it=(x for x in ())" "l.extend(it)"
-> before: 0.449 usec per loop
-> after: 0.179 usec per loop

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keywords: +patch
Added file: http://bugs.python.org/file32318/lengthhint.patch

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