Python Performance: Why 'if not list' is 2x Faster Than Using len()

> But this isn’t just about coding style, one of these is ~2x faster than the other, see for yourself:

FWIW, it's not necessary to start an interpreter for this test.

  $ py3.13 -m timeit --setup "l = []" "not l"
  10000000 loops, best of 5: 20.7 nsec per loop
  $ py3.13 -m timeit --setup "l = []" "len(l) == 0"
  10000000 loops, best of 5: 31 nsec per loop

The explanation is paywalled.

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