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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
def __reduce__(self):
return (self.__class__, (str(self),))
return (self.__class__, (self._numerator, self._denominator))
def __copy__(self):
if type(self) == Fraction:

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

1
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.