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gh-92417: `fractions`, `decimal`: Improve docs for alternative constructor methods (GH-92421) 

Co-authored-by: Ezio Melotti <ezio.melotti@gmail.com>
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Alex Waygood 2022-05-19 16:28:51 +01:00 committed by GitHub
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2 changed files with 9 additions and 8 deletions
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5
Doc/library/decimal.rst
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@ -571,9 +571,10 @@ Decimal objects
>>> Decimal(321).exp()
Decimal('2.561702493119680037517373933E+139')
.. method:: from_float(f)
.. classmethod:: from_float(f)
Classmethod that converts a float to a decimal number, exactly.
Alternative constructor that only accepts instances of :class:`float` or
:class:`int`.
Note `Decimal.from_float(0.1)` is not the same as `Decimal('0.1')`.
Since 0.1 is not exactly representable in binary floating point, the

12
Doc/library/fractions.rst
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@ -114,10 +114,10 @@ another rational number, or from a string.
.. versionadded:: 3.8
.. method:: from_float(flt)
.. classmethod:: from_float(flt)
This class method constructs a :class:`Fraction` representing the exact
value of *flt*, which must be a :class:`float`. Beware that
Alternative constructor which only accepts instances of
:class:`float` or :class:`numbers.Integral`. Beware that
``Fraction.from_float(0.3)`` is not the same value as ``Fraction(3, 10)``.
.. note::
@ -126,10 +126,10 @@ another rational number, or from a string.
:class:`Fraction` instance directly from a :class:`float`.
.. method:: from_decimal(dec)
.. classmethod:: from_decimal(dec)
This class method constructs a :class:`Fraction` representing the exact
value of *dec*, which must be a :class:`decimal.Decimal` instance.
Alternative constructor which only accepts instances of
:class:`decimal.Decimal` or :class:`numbers.Integral`.
.. note::