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 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_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))