In the derivation, we find that the mean free path λ\lambdaλ is inversely proportional to this area and the number of molecules per unit volume (nnn). However, because all molecules are moving (not just one), we add a factor of 2\sqrt{2}2 to account for the average relative velocity.
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+ elif char == 127:
Pypy is maintained, it's always been behind CPython, here is one of the Devs saying as much: