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bpo-44154: optimize Fraction pickling (GH-26186)

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Sergey B Kirpichev 2021-05-17 10:20:02 +03:00 • committed by GitHub
parent b3f65e819f
commit b102dd598d
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3 changed files with 5 additions and 2 deletions
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2
Lib/fractions.py
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@ -735,7 +735,7 @@ class Fraction(numbers.Rational):
# support for pickling, copy, and deepcopy # support for pickling, copy, and deepcopy
def __reduce__(self): def __reduce__(self):
return (self.__class__, (str(self),)) return (self.__class__, (self._numerator, self._denominator))
def __copy__(self): def __copy__(self):
if type(self) == Fraction: if type(self) == Fraction:

4
Lib/test/test_fractions.py
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@ -10,6 +10,7 @@ import functools
import sys import sys
import unittest import unittest
from copy import copy, deepcopy from copy import copy, deepcopy
import pickle
from pickle import dumps, loads from pickle import dumps, loads
F = fractions.Fraction F = fractions.Fraction
@ -691,7 +692,8 @@ class FractionTest(unittest.TestCase):
def test_copy_deepcopy_pickle(self): def test_copy_deepcopy_pickle(self):
r = F(13, 7) r = F(13, 7)
dr = DummyFraction(13, 7) dr = DummyFraction(13, 7)
self.assertEqual(r, loads(dumps(r))) for proto in range(0, pickle.HIGHEST_PROTOCOL + 1):
self.assertEqual(r, loads(dumps(r, proto)))
self.assertEqual(id(r), id(copy(r))) self.assertEqual(id(r), id(copy(r)))
self.assertEqual(id(r), id(deepcopy(r))) self.assertEqual(id(r), id(deepcopy(r)))
self.assertNotEqual(id(dr), id(copy(dr))) self.assertNotEqual(id(dr), id(copy(dr)))

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Misc/NEWS.d/next/Library/2021-05-17-07-24-24.bpo-44154.GRI5bf.rst Normal file
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@ -0,0 +1 @@
Optimize :class:`fractions.Fraction` pickling for large components.