Message 259431 - Python tracker
unpack_sequence contains 400 lines of this: "a, b, c, d, e, f, g, h, i, j = to_unpack". This code doesn't even touch BINARY_SUBSCR or BINARY_ADD. Zach, could you please run your benchmarks in rigorous mode (perf.py -r)? I'd also suggest to experiment with putting the baseline cpython as a first arg and as a second -- maybe your machine runs the second interpreter slightly faster.