Python装饰器实现参数校验

def requires(*params):
    def _deco(view_func):
        @wraps(view_func)
        def _handler(request, *args, **kw):
            # 校验参数
            for key in params:
                if key not in request.GET:
                    return JsonResponse(data={
                        'code': 'CHECK_ERROR',
                        'msg': '参数校验出错，"{}"是必选的！'.format(key)
                    })
            response = view_func(request, *args, **kw)

            return response

        return _handler

    return _deco

## 使用

    @requires('out_trade_no', 'total_amount', 'subject', 'platform')
def create(request):
    pass