human
Here's a good function header given the following:
I wrote the below code

    class TwoValueConverter(r.BaseConverter, ):
        def __init__(self, *args, **kwargs):
            super(TwoValueConverter, self).__init__(*args, **kwargs)
            self.regex = '(\\w\\w+)/(\\w\\w+)'
        def to_python(self, two_values):
            (one, two) = two_values.split('/')
            return (one, two)
        def to_url(self, values):
            return ('%s/%s' % (values[0], values[1]))
    map = r.Map([r.Rule('/<two:foo>/', endpoint='handler')], converters={'two': TwoValueConverter})
    a = map.bind('example.org', '/')
    (route, kwargs) = a.match('/qwert/yuiop/')
    assert (kwargs['foo'] == ('qwert', 'yuiop'))

What's a good function header?
assistant
#Here's a good function header.

def test_converter_with_tuples():