requests库发送multipart/form-data格式请求

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 def modify(self,data):
        url = 'http:xxx'
        data = data
        params = {"data": (None, data)} #注意这里的传参，格式是这样的
        headers = {
            'Authorization': self.auth()
        }
        responce = requests.post(url=url,headers=headers,data=params)
        return responce.content.decode('utf-8')
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