code: def upload_file_mp(self, container, src_file_path, dst_name=None,
                         content_type=None):
          
          if not os.path.exists(src_file_path):
              raise RuntimeError('file not found: ' + src_file_path)
          if not dst_name:
              dst_name = os.path.basename(src_file_path)
          if not content_type:
              content_type = "application/octet.stream"
          url = self.make_url(container, None, None)
          headers = self._base_headers
          with open(src_file_path, 'rb') as up_file:
              files = {'file': (dst_name, up_file, content_type)}
              try:
                  rsp = requests.post(url, headers=headers, files=files,
                                      timeout=self._timeout)
              except requests.exceptions.ConnectionError as e:
                  RestHttp._raise_conn_error(e)
  
          return self._handle_response(rsp)
docs: Upload a file using multi-part encoding.