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Issue #8294: Allow float and Decimal arguments in Fraction constructor.

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This commit is contained in:
Mark Dickinson 2010-04-02 22:27:36 +00:00
parent 58c1e78806
commit 7c63eee485
4 changed files with 121 additions and 20 deletions
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27
Lib/test/test_fractions.py
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@ -12,6 +12,11 @@ from cPickle import dumps, loads
F = fractions.Fraction
gcd = fractions.gcd
# decorator for skipping tests on non-IEEE 754 platforms
requires_IEEE_754 = unittest.skipUnless(
float.__getformat__("double").startswith("IEEE"),
"test requires IEEE 754 doubles")
class DummyFloat(object):
"""Dummy float class for testing comparisons with Fractions"""
@ -137,13 +142,33 @@ class FractionTest(unittest.TestCase):
self.assertRaisesMessage(ZeroDivisionError, "Fraction(12, 0)",
F, 12, 0)
self.assertRaises(TypeError, F, 1.5)
self.assertRaises(TypeError, F, 1.5 + 3j)
self.assertRaises(TypeError, F, "3/2", 3)
self.assertRaises(TypeError, F, 3, 0j)
self.assertRaises(TypeError, F, 3, 1j)
@requires_IEEE_754
def testInitFromFloat(self):
self.assertEquals((5, 2), _components(F(2.5)))
self.assertEquals((0, 1), _components(F(-0.0)))
self.assertEquals((3602879701896397, 36028797018963968),
_components(F(0.1)))
self.assertRaises(TypeError, F, float('nan'))
self.assertRaises(TypeError, F, float('inf'))
self.assertRaises(TypeError, F, float('-inf'))
def testInitFromDecimal(self):
self.assertEquals((11, 10),
_components(F(Decimal('1.1'))))
self.assertEquals((7, 200),
_components(F(Decimal('3.5e-2'))))
self.assertEquals((0, 1),
_components(F(Decimal('.000e20'))))
self.assertRaises(TypeError, F, Decimal('nan'))
self.assertRaises(TypeError, F, Decimal('snan'))
self.assertRaises(TypeError, F, Decimal('inf'))
self.assertRaises(TypeError, F, Decimal('-inf'))
def testFromString(self):
self.assertEquals((5, 1), _components(F("5")))