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  • Committer: Olivier Tilloy
  • Date: 2010-12-24 15:56:11 UTC
  • mto: This revision was merged to the branch mainline in revision 348.
  • Revision ID: olivier@tilloy.net-20101224155611-xzk75rvbm4b7ixb4
is_fraction and make_fraction: convenience functions to handle transparently
the conditional availability of the fractions module in the standard library (Python ≥ 2.6).

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test/utils.py
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import unittest
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from pyexiv2.utils import undefined_to_string, string_to_undefined
 
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from pyexiv2.utils import undefined_to_string, string_to_undefined, \
 
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                          Rational, Fraction, is_fraction, make_fraction
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class TestConversions(unittest.TestCase):
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        value = "48 50 50 49"
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        self.assertEqual(string_to_undefined(undefined_to_string(value)), value)
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class TestFractions(unittest.TestCase):
 
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    def test_is_fraction(self):
 
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        if Fraction is not None:
 
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            self.failUnless(is_fraction(Fraction()))
 
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            self.failUnless(is_fraction(Fraction(3, 5)))
 
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            self.failUnless(is_fraction(Fraction(Fraction(4, 5))))
 
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            self.failUnless(is_fraction(Fraction('3/2')))
 
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            self.failUnless(is_fraction(Fraction('-4/5')))
 
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        self.failUnless(is_fraction(Rational(3, 5)))
 
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        self.failUnless(is_fraction(Rational(-4, 5)))
 
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        self.failUnless(is_fraction(Rational.from_string("3/5")))
 
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        self.failUnless(is_fraction(Rational.from_string("-4/5")))
 
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        self.failIf(is_fraction(3 / 5))
 
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        self.failIf(is_fraction('3/5'))
 
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        self.failIf(is_fraction('2.7'))
 
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        self.failIf(is_fraction(2.7))
 
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        self.failIf(is_fraction('notafraction'))
 
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        self.failIf(is_fraction(None))
 
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    def test_make_fraction(self):
 
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        if Fraction is not None:
 
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            self.assertEqual(make_fraction(3, 5), Fraction(3, 5))
 
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            self.assertEqual(make_fraction(-3, 5), Fraction(-3, 5))
 
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            self.assertEqual(make_fraction('3/2'), Fraction(3, 2))
 
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            self.assertEqual(make_fraction('-3/4'), Fraction(-3, 4))
 
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        else:
 
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            self.assertEqual(make_fraction(3, 5), Rational(3, 5))
 
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            self.assertEqual(make_fraction(-3, 5), Rational(-3, 5))
 
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            self.assertEqual(make_fraction('3/2'), Rational(3, 2))
 
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            self.assertEqual(make_fraction('-3/4'), Rational(-3, 4))
 
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        self.assertRaises(ZeroDivisionError, make_fraction, 3, 0)
 
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        self.assertRaises(ZeroDivisionError, make_fraction, '3/0')
 
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        self.assertRaises(TypeError, make_fraction, 5, 3, 2)
 
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        self.assertRaises(TypeError, make_fraction, None)
 
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