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gh-65709: provide extra example in Decimal.fma() docs #150246

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gh-65709: provide extra example in Decimal.fma() docs #150246

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gh-65709: provide extra example in Decimal.fma() docs
skirpichev May 22, 2026
4bd8b1e
Merge branch 'main' into improve-fma-docs/65709
skirpichev May 23, 2026
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6 changes: 6 additions & 0 deletions Doc/library/decimal.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -638,6 +638,12 @@ Decimal objects

>>> Decimal(2).fma(3, 5)
Decimal('11')
>>> with localcontext(ExtendedContext):
... a, b, c = map(Decimal, ['888565290', '1557.96930',
... '-86087.7578'])
... a.fma(b, c), a*b + c
...
(Decimal('1.38435736E+12'), Decimal('1.38435735E+12'))

.. method:: is_canonical()

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8 changes: 7 additions & 1 deletion Modules/_decimal/_decimal.c
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Expand Up @@ -4945,12 +4945,18 @@ self*other.

>>> Decimal(2).fma(3, 5)
Decimal('11')
>>> with localcontext(ExtendedContext):
... a, b, c = map(Decimal, ['888565290', '1557.96930',
... '-86087.7578'])
... a.fma(b, c), a*b + c
...
(Decimal('1.38435736E+12'), Decimal('1.38435735E+12'))
[clinic start generated code]*/

static PyObject *
_decimal_Decimal_fma_impl(PyObject *self, PyTypeObject *cls, PyObject *other,
PyObject *third, PyObject *context)
/*[clinic end generated code: output=db49a777e85b71e4 input=2104c001f6077c35]*/
/*[clinic end generated code: output=db49a777e85b71e4 input=cf13278e863e8269]*/
Dec_TernaryFuncVA(mpd_qfma)

/* Boolean functions, no context arg */
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10 changes: 8 additions & 2 deletions Modules/_decimal/clinic/_decimal.c.h
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