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Add "strict" to dotproduct(). Add docstring. Factor-out common code. #100480

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Dec 23, 2022
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Add "strict" to dotproduct(). Add docstring. Factor-out common code. #100480

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5 changes: 3 additions & 2 deletions Doc/library/itertools.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -834,7 +834,8 @@ which incur interpreter overhead.
return chain.from_iterable(repeat(tuple(iterable), n))

def dotproduct(vec1, vec2):
return sum(map(operator.mul, vec1, vec2))
"Compute a sum of products."
return sum(starmap(operator.mul, zip(vec1, vec2, strict=True)))

def convolve(signal, kernel):
# See: https://betterexplained.com/articles/intuitive-convolution/
Expand All @@ -846,7 +847,7 @@ which incur interpreter overhead.
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))
yield dotproduct(kernel, window)

def polynomial_from_roots(roots):
"""Compute a polynomial's coefficients from its roots.
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