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bpo-44154: optimize Fraction pickling by skirpichev · Pull Request #26186 · python/cpython · GitHub

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bpo-44154: optimize Fraction pickling #26186

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Merged
rhettinger merged 1 commit into from
May 17, 2021
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bpo-44154: optimize Fraction pickling #26186

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2 changes: 1 addition & 1 deletion Lib/fractions.py
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Original file line number Diff line number Diff line change
Expand Up @@ -735,7 +735,7 @@ def __bool__(a):
# 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:
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4 changes: 3 additions & 1 deletion Lib/test/test_fractions.py
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,7 @@
import sys
import unittest
from copy import copy, deepcopy
import pickle
from pickle import dumps, loads
F = fractions.Fraction

Expand Down Expand Up @@ -691,7 +692,8 @@ def testApproximateCos1(self):
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)))
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1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Library/2021-05-17-07-24-24.bpo-44154.GRI5bf.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
Optimize :class:`fractions.Fraction` pickling for large components.
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