test_etree.py 文件源码

def test_getprevious(self):
        Element    = self.etree.Element
        SubElement = self.etree.SubElement

        a = Element('a')
        b = SubElement(a, 'b')
        c = SubElement(a, 'c')
        d = SubElement(b, 'd')
        self.assertEqual(
            None,
            a.getprevious())
        self.assertEqual(
            b,
            c.getprevious())
        self.assertEqual(
            None,
            b.getprevious())