cpython: 902e82f71880 (original) (raw)

Mercurial > cpython

changeset 102834:902e82f71880

Issue #27539: Merge from 3.5. [#27539]

Mark Dickinson dickinsm@gmail.com
date	Mon, 22 Aug 2016 10:56:06 +0100
parents	485d7c341386(current diff)7eea5b87f5fa(diff)
children	7dd85b19c873
files	Lib/fractions.py Lib/test/test_fractions.py Misc/ACKS Misc/NEWS
diffstat	4 files changed, 22 insertions(+), 1 deletions(-)[+] [-] Lib/fractions.py 6 Lib/test/test_fractions.py 13 Misc/ACKS 1 Misc/NEWS 3

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line diff

--- a/Lib/fractions.py +++ b/Lib/fractions.py @@ -460,10 +460,14 @@ class Fraction(numbers.Rational): return Fraction(a._numerator ** power, a._denominator ** power, _normalize=False)

```
           else:[](#l1.7)
```

           elif a._numerator >= 0:[](#l1.8)
               return Fraction(a._denominator ** -power,[](#l1.9)
                               a._numerator ** -power,[](#l1.10)
                               _normalize=False)[](#l1.11)

```
           else:[](#l1.12)
```

               return Fraction((-a._denominator) ** -power,[](#l1.13)

                               (-a._numerator) ** -power,[](#l1.14)

                               _normalize=False)[](#l1.15)
       else:[](#l1.16)
           # A fractional power will generally produce an[](#l1.17)
           # irrational number.[](#l1.18)

--- a/Lib/test/test_fractions.py +++ b/Lib/test/test_fractions.py @@ -356,6 +356,19 @@ class FractionTest(unittest.TestCase): z = pow(F(-1), F(1, 2)) self.assertAlmostEqual(z.real, 0) self.assertEqual(z.imag, 1)

   # Regression test for #27539.[](#l2.7)

```
   p = F(-1, 2) ** 0[](#l2.8)
```

   self.assertEqual(p, F(1, 1))[](#l2.9)

   self.assertEqual(p.numerator, 1)[](#l2.10)

   self.assertEqual(p.denominator, 1)[](#l2.11)

```
   p = F(-1, 2) ** -1[](#l2.12)
```

   self.assertEqual(p, F(-2, 1))[](#l2.13)

   self.assertEqual(p.numerator, -2)[](#l2.14)

   self.assertEqual(p.denominator, 1)[](#l2.15)

```
   p = F(-1, 2) ** -2[](#l2.16)
```

   self.assertEqual(p, F(4, 1))[](#l2.17)

   self.assertEqual(p.numerator, 4)[](#l2.18)

   self.assertEqual(p.denominator, 1)[](#l2.19)

def testMixedArithmetic(self): self.assertTypedEquals(F(11, 10), F(1, 10) + 1)

--- a/Misc/ACKS +++ b/Misc/ACKS @@ -218,6 +218,7 @@ Katherine Busch Ralph Butler Laurent De Buyst Zach Byrne +Vedran Čačić Nicolas Cadou Jp Calderone Arnaud Calmettes

--- a/Misc/NEWS +++ b/Misc/NEWS @@ -38,6 +38,9 @@ Core and Builtins Library ------- +- Issue #27539: Fix unnormalised Fraction.__pow__ result in the case

of negative exponent and negative base. +

Issue #21718: cursor.description is now available for queries using CTEs.
Issue #27819: In distutils sdists, simply produce the "gztar" (gzipped tar