Class BadPattern

Lib/test/test_string/test_string.py:376–383

        self.assertEqual(s.substitute(m), 'tim likes to eat a bag of ham')

        class BadPattern(Template):
            pattern = r"""
            (?P<badname>.*)                     |
            (?P<escaped>@{2})                   |
            @(?P<named>[_a-z][._a-z0-9]*)       |
            @{(?P<braced>[_a-z][._a-z0-9]*)}    |
            (?P<invalid>@)                      |
            """
        s = BadPattern('@bag.foo.who likes to eat a bag of @bag.what')
        self.assertRaises(ValueError, s.substitute, {})
        self.assertRaises(ValueError, s.safe_substitute, {})