test_arrays.py 文件源码

def test_simple(self):
        # create classes holding simple numeric types, and check
        # various properties.

        init = range(15, 25)

        for fmt in formats:
            alen = len(init)
            int_array = ARRAY(fmt, alen)

            ia = int_array(*init)
            # length of instance ok?
            self.assertEqual(len(ia), alen)

            # slot values ok?
            values = [ia[i] for i in range(alen)]
            self.assertEqual(values, init)

            # out-of-bounds accesses should be caught
            with self.assertRaises(IndexError): ia[alen]
            with self.assertRaises(IndexError): ia[-alen-1]

            # change the items
            from operator import setitem
            new_values = range(42, 42+alen)
            [setitem(ia, n, new_values[n]) for n in range(alen)]
            values = [ia[i] for i in range(alen)]
            self.assertEqual(values, new_values)

            # are the items initialized to 0?
            ia = int_array()
            values = [ia[i] for i in range(alen)]
            self.assertEqual(values, [0] * alen)

            # Too many initializers should be caught
            self.assertRaises(IndexError, int_array, *range(alen*2))

        CharArray = ARRAY(c_char, 3)

        ca = CharArray("a", "b", "c")

        # Should this work? It doesn't:
        # CharArray("abc")
        self.assertRaises(TypeError, CharArray, "abc")

        self.assertEqual(ca[0], "a")
        self.assertEqual(ca[1], "b")
        self.assertEqual(ca[2], "c")
        self.assertEqual(ca[-3], "a")
        self.assertEqual(ca[-2], "b")
        self.assertEqual(ca[-1], "c")

        self.assertEqual(len(ca), 3)

        # slicing is now supported, but not extended slicing (3-argument)!
        from operator import getslice, delitem
        self.assertRaises(TypeError, getslice, ca, 0, 1, -1)

        # cannot delete items
        self.assertRaises(TypeError, delitem, ca, 0)