code: def update_board_chart(self, chart, team_context, board, name):
          
          project = None
          team = None
          if team_context is not None:
              if team_context.project_id:
                  project = team_context.project_id
              else:
                  project = team_context.project
              if team_context.team_id:
                  team = team_context.team_id
              else:
                  team = team_context.team
  
          route_values = {}
          if project is not None:
              route_values['project'] = self._serialize.url('project', project, 'string')
          if team is not None:
              route_values['team'] = self._serialize.url('team', team, 'string')
          if board is not None:
              route_values['board'] = self._serialize.url('board', board, 'str')
          if name is not None:
              route_values['name'] = self._serialize.url('name', name, 'str')
          content = self._serialize.body(chart, 'BoardChart')
          response = self._send(http_method='PATCH',
                                location_id='45fe888c-239e-49fd-958c-df1a1ab21d97',
                                version='5.0',
                                route_values=route_values,
                                content=content)
          return self._deserialize('BoardChart', response)
docs: UpdateBoardChart.
          Update a board chart
          :param :class:`<BoardChart> <azure.devops.v5_0.work.models.BoardChart>` chart:
          :param :class:`<TeamContext> <azure.devops.v5_0.work.models.TeamContext>` team_context: The team context for the operation
          :param str board: Identifier for board, either board's backlog level name (Eg:"Stories") or Id
          :param str name: The chart name
          :rtype: :class:`<BoardChart> <azure.devops.v5_0.work.models.BoardChart>`