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gh-157135: Fix documentation errors in the half-turn `*pi` functions by fedonman · Pull Request #157136 · python/cpython · GitHub

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gh-157135: Fix documentation errors in the half-turn *pi functions #157136

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Merged
StanFromIreland merged 1 commit into from
Sep 8, 2026
+4 −4
Conversation 4 Commits 1 Checks 64 Files changed 2
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gh-157135: Fix documentation errors in the half-turn *pi functions #157136

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2 changes: 1 addition & 1 deletion Doc/library/math.rst
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Expand Up @@ -90,7 +90,7 @@ noted otherwise, all return values are floats.
:func:`atan(x) <atan>` Arc tangent of *x*, in radians
:func:`atanpi(x) <atanpi>` Arc tangent of *x*, in half-turns
:func:`atan2(y, x) <atan2>` ``atan(y / x)``, in radians
:func:`atan2pi(y, x) <atan2pi>` ``atan(y / x)``, in half-turns
:func:`atan2pi(y, x) <atan2pi>` ``atanpi(y / x)``, in half-turns
:func:`cos(x) <cos>` Cosine of *x* radians
:func:`cospi(x) <cospi>` Cosine of *x⋅π* radians
:func:`sin(x) <sin>` Sine of *x* radians
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6 changes: 3 additions & 3 deletions Modules/mathmodule.c
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Expand Up @@ -256,7 +256,7 @@ m_asinpi(double x)

#ifndef HAVE_ATANPI
/*
asin(x)/pi. It conforms to C23 Annex 'F'.
atan(x)/pi. It conforms to C23 Annex 'F'.
*/

static double
Expand All @@ -274,7 +274,7 @@ m_atanpi(double x)

#ifndef HAVE_ATAN2PI
/*
asin(x)/pi. It conforms to C23 Annex 'F'.
atan2(y, x)/pi. It conforms to C23 Annex 'F'.
*/

static double
Expand Down Expand Up @@ -1136,7 +1136,7 @@ FUNC1D(atanh, atanh, 0,
FUNC1D(atanpi, m_atanpi, 0,
"atanpi($module, x, /)\n--\n\n"
"Return the arc tangent (measured in half-turns) of x.\n\n"
"The result is between 0 and 1.",
"The result is between -1/2 and 1/2.",
"expected a number in range from -1 up to 1, got %s")
FUNC1(cbrt, cbrt, 0,
"cbrt($module, x, /)\n--\n\n"
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