Serhiy Storchaka <storch...@gmail.com> added the comment:
Mark, I deliberately have not used the exact formula for the overflow.
Comparison with the constant is much cheaper than division or multiplication.
Microbencmark:
./python -m timeit -s 'f="%.1234567890s"*100;x=("",)*100' 'f%x'
Before changeset 064c2d0483f8: 10000 loops, best of 3: 27.1 usec per loop
Changeset 064c2d0483f8: 10000 loops, best of 3: 25.7 usec per loop
Original patch: 100000 loops, best of 3: 18.2 usec per loop
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<http://bugs.python.org/issue14700>
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