On 04/25/2018 02:55 PM, Tim Peters wrote:
This becomes a question of seasoned judgment. For example, here's a
real loop summing a series expansion, until the new terms become so
small they make no difference to the running total (a common enough
pattern in code slinging floats or decimals):
while True:
old = total
total += term
if old == total:
return total
term *= mx2 / (i*(i+1))
i += 2
To my eyes, this is genuinely harder to follow, despite its relative brevity:
while total != (total := total + term):
term *= mx2 / (i*(i+1))
i += 2
return total
So I wouldn't use binding expressions in that case. I don't have a
compelling head argument for _why_ I find the latter spelling harder
to follow, but I don't need a theory to know that I in fact do.
I know why I do: I see "while total != total" and my gears start stripping.
On the other hand,
while total != (total + term as total):
...
I find still intelligible. (Yes, I know "as" is dead, just wanted to throw
that out there.)
--
~Ethan~
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