python flask model 序列化

class DictSerializable(object):
    def as_dict(self,*args):
        result = OrderedDict()
        keys=args or self.__mapper__.c.keys()
        for key in keys:
            if hasattr(self,key):
                obj=getattr(self, key)
                if isinstance(obj,basestring):
                    value=obj
                elif isinstance(obj,int) or isinstance(obj,long) or isinstance(obj,float):
                    value=obj
                elif isinstance(obj,Decimal):
                    value=str(obj)
                elif isinstance(obj,types.choice.Choice):
                    value=obj.code
                elif isinstance(obj,datetime):
                    value=obj.strftime(‘%Y-%m-%d %M:%H:%S‘)
                elif isinstance(obj,date):
                    value=obj.strftime(‘%Y-%m-%d‘)
                else:
                    raise Exception(‘不支持系列化[%s]类型!‘ % type(obj))
                result[key] = value

        return result

    def as_json(self,*args):
        d=self.as_dict(*args)

        return json.dumps(d)

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 result1=pagination(page,rows1)
    for credit in result1:
        rows.append(credit.as_dict(‘id‘,‘title‘,‘week_rule‘,‘latefee_rate‘,‘extra_cost_rate‘,‘due_days‘,‘remark‘))
      
return json.dumps(credit_result)

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