调用：res = rest.delete(api, json=para_data, headers=header)

# delete方法
def delete(self, url, **kwargs):
        return self.request(url, "DELETE", **kwargs)
# request方法：

def request(self, url, method, data=None, json=None, **kwargs):
        url = self.api_url + url
        headers = dict(**kwargs).get("headers")
        params = dict(**kwargs).get("params")
        files = dict(**kwargs).get("files")
        cookies = dict(**kwargs).get("cookies")
        self.request_log(url, method, data, json, params, headers, files, cookies)
        if method == "GET":
            return self.session.get(url, **kwargs)
        if method == "POST":
            return requests.post(url, data, json, **kwargs)
        if method == "PUT":
            if json:
                data = complexjson.dumps(json)
            return self.session.put(url, data, **kwargs)
        if method == "DELETE":
            return requests.delete(url, **kwargs)
        if method == "PATCH":
            if json:
                data = complexjson.dumps(json)
            return self.session.patch(url, data, **kwargs)

打断点调试后发现kwargs中的原有的字典json赋给了参数json,然后kwargs就只有headers了，导致请求requests.delete(url, kwargs)时kwargs缺少了json入参，怎么样json参数能一直在**kwargs中呢？