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Merge branch 'master' into import-refcounts

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Serhiy Storchaka 2020-12-31 00:38:54 +02:00
parent c31124f0d8 f421bfce80
commit c8daad6426
1 changed files with 2 additions and 2 deletions
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Doc/library/itertools.rst
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@ -791,9 +791,9 @@ which incur interpreter overhead.
# convolve(data, [0.25, 0.25, 0.25, 0.25]) --> Moving average (blur)
# convolve(data, [1, -1]) --> 1st finite difference (1st derivative)
# convolve(data, [1, -2, 1]) --> 2nd finite difference (2nd derivative)
kernel = list(reversed(kernel))
kernel = tuple(kernel)[::-1]
n = len(kernel)
window = collections.deque([0] * n, maxlen=n)
window = collections.deque([0], maxlen=n) * n
for x in chain(signal, repeat(0, n-1)):
window.append(x)
yield sum(map(operator.mul, kernel, window))