validate.py 文件源码

def page(self, start, end):
        s_schema = Schema({ Required('start'): All(int, Range(min=0))})
        e_schema = Schema({ Required('end'):   All(int, Range(min=0))})

        s_status, s_result = self.try_schema('start', start, s_schema)

        if not s_status:
            return [s_status, s_result]


        e_status, e_result = self.try_schema('end', end, e_schema)

        if not e_status:
            return [e_status, e_result]

        if end < start:
            return [False, 'ending page cannot be lower than starting page']


        total_pages = end - start

        if total_pages > 50:
            return [False, 'you cannot request more than 50 pages']

        return [True, None]