May 1, 2025 · May 1, 2025
diff --git a/Lib/fractions.py b/Lib/fractions.py
        Beware that Fraction.from_float(0.3) != Fraction(3, 10).

        """
        if isinstance(f, numbers.Integral):
        if not isinstance(f, float):
            if not isinstance(f, numbers.Integral):
                raise TypeError("%s.from_float() only takes floats, not %r (%s)" %
                                (cls.__name__, f, type(f).__name__))
            return cls(f)
        elif not isinstance(f, float):
            raise TypeError("%s.from_float() only takes floats, not %r (%s)" %
                            (cls.__name__, f, type(f).__name__))
        return cls._from_coprime_ints(*f.as_integer_ratio())

    @classmethod
    def from_decimal(cls, dec):
        """Converts a finite Decimal instance to a rational number, exactly."""
        from decimal import Decimal
        if isinstance(dec,numbers.Integral):
 dec = Decimal(int(dec))
 elif not isinstance(dec, Decimal):
 raise TypeError(
 "%s.from_decimal() only takes Decimals, not %r (%s)" %
    (cls.__name__,dec, type(dec).__name__))
        ifnotisinstance(dec,Decimal):
 if not isinstance(dec, numbers.Integral):
        raise TypeError(
        "%s.from_decimal() only takes Decimals, not %r (%s)" %
    (cls.__name__, dec, type(dec).__name__))
 dec = int(dec)
        return cls._from_coprime_ints(*dec.as_integer_ratio())

    @classmethod
diff --git a/Misc/NEWS.d/next/Library/2025-05-01-16-44-16.gh-issue-72902.19qwJW.rst b/Misc/NEWS.d/next/Library/2025-05-01-16-44-16.gh-issue-72902.19qwJW.rst
 Optimize (~x1.40-50 speedup) :meth:`fractions.Fraction.from_decimal` and
 :meth:`fractions.Fraction.from_float` for :class:`~decimal.Decimal` and
 :class:`float` inputs, respectively.  Patch by Sergey B Kirpichev.
Original file line number	Diff line number	Diff line change
Expand Up		@@ -335,23 +335,23 @@ def from_float(cls, f):
		Beware that Fraction.from_float(0.3) != Fraction(3, 10).

		"""
		if isinstance(f, numbers.Integral):
		if not isinstance(f, float):
		if not isinstance(f, numbers.Integral):
		raise TypeError("%s.from_float() only takes floats, not %r (%s)" %
		(cls.__name__, f, type(f).__name__))
		return cls(f)
		elif not isinstance(f, float):
		raise TypeError("%s.from_float() only takes floats, not %r (%s)" %
		(cls.__name__, f, type(f).__name__))
		return cls._from_coprime_ints(*f.as_integer_ratio())

		@classmethod
		def from_decimal(cls, dec):
		"""Converts a finite Decimal instance to a rational number, exactly."""
		from decimal import Decimal
		if isinstance(dec,numbers.Integral):
		dec = Decimal(int(dec))
		elif not isinstance(dec, Decimal):
		raise TypeError(
		"%s.from_decimal() only takes Decimals, not %r (%s)" %
		(cls.__name__,dec, type(dec).__name__))
		ifnotisinstance(dec,Decimal):
		if not isinstance(dec, numbers.Integral):
		raise TypeError(
		"%s.from_decimal() only takes Decimals, not %r (%s)" %
		(cls.__name__, dec, type(dec).__name__))
		dec = int(dec)
		return cls._from_coprime_ints(*dec.as_integer_ratio())

		@classmethod
Expand Down
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1,3 @@
		Optimize (~x1.40-50 speedup) :meth:`fractions.Fraction.from_decimal` and
		:meth:`fractions.Fraction.from_float` for :class:`~decimal.Decimal` and
		:class:`float` inputs, respectively. Patch by Sergey B Kirpichev.