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[3.9] Minor improvements to the convolve() recipe (GH-24012) #24520

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Merged
merged 1 commit into from
Feb 15, 2021
Merged

[3.9] Minor improvements to the convolve() recipe (GH-24012) #24520

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4 changes: 2 additions & 2 deletions Doc/library/itertools.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -774,9 +774,9 @@ 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))
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1 change: 1 addition & 0 deletions Doc/tools/susp-ignored.csv
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Expand Up @@ -171,6 +171,7 @@ library/ipaddress,,:db00,2001:db00::0/ffff:ff00::
library/ipaddress,,::,2001:db00::0/ffff:ff00::
library/itertools,,:step,elements from seq[start:stop:step]
library/itertools,,:stop,elements from seq[start:stop:step]
library/itertools,,::,kernel = tuple(kernel)[::-1]
library/logging.handlers,,:port,host:port
library/mmap,,:i2,obj[i1:i2]
library/multiprocessing,,`,# Add more tasks using `put()`
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