[Peter O'Connor]
>> ...
>> We could use given for both the in-loop variable update and the variable
>> initialization:
>> smooth_signal = [average given average=(1-decay)*average + decay*x
>> for x in signal] given average=0.
[Steven D'Aprano <st...@pearwood.info>]
> I don't think that will work under Nick's proposal, as Nick does not
> want assignments inside the comprehension to be local to the surrounding
> scope. (Nick, please correct me if I'm wrong.)
Nick appears to have moved on from "given" to more-general augmented
assignment expressions. See PEP 577, but note that it's still a
work-in-progress:
https://github.com/python/peps/pull/665
Under that PEP,
average = 0
smooth_signal = [(average := (1-decay)*average + decay*x)
for x in signal]
Or, for the running sums example:
total = 0
sums = [(total += x) for x in data]
I'm not entirely clear on whether the "extra" parens are needed, so
added 'em anyway to make grouping clear.
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