test_irc.py 文件源码

def test_foldr(self):
        """
        Apply a function of two arguments cumulatively to the items of
        a sequence, from right to left, so as to reduce the sequence to
        a single value.
        """
        self.assertEqual(
            irc._foldr(operator.sub, 0, [1, 2, 3, 4]),
            -2)

        def insertTop(l, x):
            l.insert(0, x)
            return l

        self.assertEqual(
            irc._foldr(insertTop, [], [[1], [2], [3], [4]]),
            [[[[[], 4], 3], 2], 1])