tests.py 文件源码

def test_complex_custom_formatting(self):
        class User(object):
            def __init__(self, id, username):
                self.id = id
                self.username = username
            def __html_format__(self, format_spec):
                if format_spec == 'link':
                    return Markup('<a href="/user/{0}">{1}</a>').format(
                        self.id,
                        self.__html__(),
                    )
                elif format_spec:
                    raise ValueError('Invalid format spec')
                return self.__html__()
            def __html__(self):
                return Markup('<span class=user>{0}</span>').format(self.username)

        user = User(1, 'foo')
        assert Markup('<p>User: {0:link}').format(user) == \
            Markup('<p>User: <a href="/user/1"><span class=user>foo</span></a>')