Method test_floatconversion

Lib/test/test_float.py:207–252

(self)

        self.assertAlmostEqual(float("  .25e-1  "), .025)

    def test_floatconversion(self):
        # Make sure that calls to __float__() work properly
        class Foo2(float):
            def __float__(self):
                return 42.

        class Foo3(float):
            def __new__(cls, value=0.):
                return float.__new__(cls, 2*value)

            def __float__(self):
                return self

        class Foo4(float):
            def __float__(self):
                return 42

        # Issue 5759: __float__ not called on str subclasses (though it is on
        # unicode subclasses).
        class FooStr(str):
            def __float__(self):
                return float(str(self)) + 1

        self.assertEqual(float(FloatLike(42.)), 42.)
        self.assertEqual(float(Foo2()), 42.)
        with self.assertWarns(DeprecationWarning):
            self.assertEqual(float(Foo3(21)), 42.)
        self.assertRaises(TypeError, float, Foo4(42))
        self.assertEqual(float(FooStr('8')), 9.)

        self.assertRaises(TypeError, time.sleep, FloatLike(""))

        # Issue #24731
        f = FloatLike(OtherFloatSubclass(42.))
        with self.assertWarns(DeprecationWarning):
            self.assertEqual(float(f), 42.)
        with self.assertWarns(DeprecationWarning):
            self.assertIs(type(float(f)), float)
        with self.assertWarns(DeprecationWarning):
            self.assertEqual(FloatSubclass(f), 42.)
        with self.assertWarns(DeprecationWarning):
            self.assertIs(type(FloatSubclass(f)), FloatSubclass)

        self.assertEqual(float(MyIndex(42)), 42.0)
        self.assertRaises(OverflowError, float, MyIndex(2**2000))
        self.assertRaises(TypeError, float, MyInt(42))

    def test_keyword_args(self):
        with self.assertRaisesRegex(TypeError, 'keyword argument'):