问为什么在通过django数据显示图形时，实际显示的是空空间？

EN

labels = list(account_graph.keys()) # ['Food', 'Gas', 'Friends'] 
data = list(account_graph.values()) # [-6.09, -20.0, -7.0]

return render(request, "finances/account.html", {'labels': labels, 'data': data})

<div id='expenses'></div>

<script>

      var data = [{
        values: {{data|safe}},
        labels: {{labels|safe}},
        type: 'pie'
      }];

      var layout = {
        height: 400, 
        width: 500
      }

      Plotly.newPlot('expenses', data, layout);
</script>