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gh-130203: Further simplify `math.sumprod` documentation by Akuli · Pull Request #130206 · python/cpython · GitHub

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gh-130203: Further simplify math.sumprod documentation #130206

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gh-130203: Further simplify math.sumprod documentation #130206

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2 changes: 1 addition & 1 deletion Doc/library/math.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -607,7 +607,7 @@ Summation and product functions

Roughly equivalent to::

sum(map(operator.mul, p, q, strict=True))
sum(px * qx for px, qx in zip(p, q, strict=True))

willingc Feb 17, 2025

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

I would suggest leaving as is but adding a sentence below such as:

sum(map(operator.mul, p, q, strict=True))

where the multiply operator is used to multiply each item in the *p* and *q* iterables together 
and sum the products.

I'm not sure but I suspect the original command is more performant. I'm fine also with adding the proposed item as an alternative illustration.

I would leave the .c file unchanged using map and operator.mul.

rhettinger Feb 18, 2025

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Choose a reason Spam Abuse Off Topic Outdated Duplicate Resolved Low Quality

ISTM the proposed extra sentence just repeats the first sentence before the rough equivalent.

For float and mixed int/float inputs, the intermediate products
and sums are computed with extended precision.
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4 changes: 2 additions & 2 deletions Modules/clinic/mathmodule.c.h
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4 changes: 2 additions & 2 deletions Modules/mathmodule.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2750,15 +2750,15 @@ Return the sum of products of values from two iterables p and q.

Roughly equivalent to:

sum(map(operator.mul, p, q, strict=True))
sum(px * qx for px, qx in zip(p, q, strict=True))

For float and mixed int/float inputs, the intermediate products
and sums are computed with extended precision.
[clinic start generated code]*/

static PyObject *
math_sumprod_impl(PyObject *module, PyObject *p, PyObject *q)
/*[clinic end generated code: output=6722dbfe60664554 input=a2880317828c61d2]*/
/*[clinic end generated code: output=6722dbfe60664554 input=75b4b596dce5611e]*/
{
PyObject *p_i = NULL, *q_i = NULL, *term_i = NULL, *new_total = NULL;
PyObject *p_it, *q_it, *total;
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