def test_inheritance(self):

    class D(SheetWriter):

        def write_row(self, row):
            pass
    d = D('t', 'e', 's')
    d.write_row([11, 11])
def test_inheritance(self):

    class D(SheetWriter):

        def write_row(self, row):
            pass
    d = D('t', 'e', 's')
    d.write_row([11, 11])