Method test_match_getitem

Lib/test/test_re.py:562–604

(self)

        self.assertEqual(m.group(Index(2), Index(1)), ('b', 'a'))

    def test_match_getitem(self):
        pat = re.compile('(?:(?P<a1>a)|(?P<b2>b))(?P<c3>c)?')

        m = pat.match('a')
        self.assertEqual(m['a1'], 'a')
        self.assertEqual(m['b2'], None)
        self.assertEqual(m['c3'], None)
        self.assertEqual('a1={a1} b2={b2} c3={c3}'.format_map(m), 'a1=a b2=None c3=None')
        self.assertEqual(m[0], 'a')
        self.assertEqual(m[1], 'a')
        self.assertEqual(m[2], None)
        self.assertEqual(m[3], None)
        with self.assertRaisesRegex(IndexError, 'no such group'):
            m['X']
        with self.assertRaisesRegex(IndexError, 'no such group'):
            m[-1]
        with self.assertRaisesRegex(IndexError, 'no such group'):
            m[4]
        with self.assertRaisesRegex(IndexError, 'no such group'):
            m[0, 1]
        with self.assertRaisesRegex(IndexError, 'no such group'):
            m[(0,)]
        with self.assertRaisesRegex(IndexError, 'no such group'):
            m[(0, 1)]
        with self.assertRaisesRegex(IndexError, 'no such group'):
            'a1={a2}'.format_map(m)

        m = pat.match('ac')
        self.assertEqual(m['a1'], 'a')
        self.assertEqual(m['b2'], None)
        self.assertEqual(m['c3'], 'c')
        self.assertEqual('a1={a1} b2={b2} c3={c3}'.format_map(m), 'a1=a b2=None c3=c')
        self.assertEqual(m[0], 'ac')
        self.assertEqual(m[1], 'a')
        self.assertEqual(m[2], None)
        self.assertEqual(m[3], 'c')

        # Cannot assign.
        with self.assertRaises(TypeError):
            m[0] = 1

        # No len().
        self.assertRaises(TypeError, len, m)

    def test_re_fullmatch(self):
        # Issue 16203: Proposal: add re.fullmatch() method.