def test_from_string(self): self.assertEqual(Rational.from_string('4/3'), Rational(4, 3)) self.assertEqual(Rational.from_string('-4/3'), Rational(-4, 3)) self.assertRaises(ValueError, Rational.from_string, '+3/5') self.assertRaises(ValueError, Rational.from_string, '3 / 5') self.assertRaises(ValueError, Rational.from_string, '3/-5') self.assertRaises(ValueError, Rational.from_string, 'invalid')
def exif_coord(self): """ Return the coordinate in the format that can be used to assign to an exif tag using the pyexiv2 library. """ from pyexiv2.utils import Rational (d, m, s) = self.dms return (Rational(abs(d), 1), Rational(m, 1), Rational(s * 1e7, 1e7))
def test_equality(self): r1 = Rational(2, 1) r2 = Rational(2, 1) r3 = Rational(8, 4) r4 = Rational(3, 2) self.assertEqual(r1, r2) self.assertEqual(r1, r3) self.assertNotEqual(r1, r4)
def test_match_string(self): self.assertEqual(Rational.match_string('4/3'), (4, 3)) self.assertEqual(Rational.match_string('-4/3'), (-4, 3)) self.assertEqual(Rational.match_string('0/3'), (0, 3)) self.assertEqual(Rational.match_string('0/0'), (0, 0)) self.assertRaises(ValueError, Rational.match_string, '+3/5') self.assertRaises(ValueError, Rational.match_string, '3 / 5') self.assertRaises(ValueError, Rational.match_string, '3/-5') self.assertRaises(ValueError, Rational.match_string, 'invalid')
def test_from_string(self): self.assertEqual(Rational.from_string('4/3'), Rational(4, 3)) self.assertEqual(Rational.from_string('-4/3'), Rational(-4, 3)) self.assertRaises(ValueError, Rational.from_string, '+3/5') self.assertRaises(ValueError, Rational.from_string, '3 / 5') self.assertRaises(ValueError, Rational.from_string, '3/-5') self.assertRaises(ValueError, Rational.from_string, 'invalid') self.assertRaises(ZeroDivisionError, Rational.from_string, '1/0') self.assertRaises(ZeroDivisionError, Rational.from_string, '0/0')
def test_read_only(self): r = Rational(3, 4) try: r.numerator = 5 except AttributeError: pass else: self.fail('Numerator is not read-only.') try: r.denominator = 5 except AttributeError: pass else: self.fail('Denominator is not read-only.')
def test_make_fraction(self): if Fraction is not None: self.assertEqual(make_fraction(3, 5), Fraction(3, 5)) self.assertEqual(make_fraction(-3, 5), Fraction(-3, 5)) self.assertEqual(make_fraction('3/2'), Fraction(3, 2)) self.assertEqual(make_fraction('-3/4'), Fraction(-3, 4)) self.assertEqual(make_fraction('0/0'), Fraction(0, 1)) else: self.assertEqual(make_fraction(3, 5), Rational(3, 5)) self.assertEqual(make_fraction(-3, 5), Rational(-3, 5)) self.assertEqual(make_fraction('3/2'), Rational(3, 2)) self.assertEqual(make_fraction('-3/4'), Rational(-3, 4)) self.assertEqual(make_fraction('0/0'), Rational(0, 1)) self.assertRaises(ZeroDivisionError, make_fraction, 3, 0) self.assertRaises(ZeroDivisionError, make_fraction, '3/0') self.assertRaises(TypeError, make_fraction, 5, 3, 2) self.assertRaises(TypeError, make_fraction, None)
def test_is_fraction(self): if Fraction is not None: self.failUnless(is_fraction(Fraction())) self.failUnless(is_fraction(Fraction(3, 5))) self.failUnless(is_fraction(Fraction(Fraction(4, 5)))) self.failUnless(is_fraction(Fraction('3/2'))) self.failUnless(is_fraction(Fraction('-4/5'))) self.failUnless(is_fraction(Rational(3, 5))) self.failUnless(is_fraction(Rational(-4, 5))) self.failUnless(is_fraction(Rational.from_string("3/5"))) self.failUnless(is_fraction(Rational.from_string("-4/5"))) self.failIf(is_fraction(3 / 5)) self.failIf(is_fraction('3/5')) self.failIf(is_fraction('2.7')) self.failIf(is_fraction(2.7)) self.failIf(is_fraction('notafraction')) self.failIf(is_fraction(None))
def fraction_to_rational(fra): """ Take a fraction and return a stupid Rational to make stupid damned pyexiv2 happy. If it's not a fraction, just hand it back and hope for the best. """ from pyexiv2.utils import Rational if fra.__class__.__name__ == 'Fraction': return Rational(fra.limit_denominator().numerator, fra.limit_denominator().denominator) else: return fra
def test_to_float(self): self.assertEqual(Rational(3, 6).to_float(), 0.5) self.assertEqual(Rational(11, 11).to_float(), 1.0) self.assertEqual(Rational(-2, 8).to_float(), -0.25) self.assertEqual(Rational(0, 3).to_float(), 0.0)
def test_repr(self): self.assertEqual(repr(Rational(3, 5)), 'Rational(3, 5)') self.assertEqual(repr(Rational(-3, 5)), 'Rational(-3, 5)') self.assertEqual(repr(Rational(0, 3)), 'Rational(0, 3)')
def test_to_string(self): self.assertEqual(str(Rational(3, 5)), '3/5') self.assertEqual(str(Rational(-3, 5)), '-3/5')
def test_constructor(self): r = Rational(2, 1) self.assertEqual(r.numerator, 2) self.assertEqual(r.denominator, 1) self.assertRaises(ZeroDivisionError, Rational, 1, 0)