使用matplotlib示例时Django中的错误

目前，matplotlib的写入功能要求

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import iodef mplimage(request):    f = matplotlib.figure.Figure()    # Code that sets up figure goes here; in the question, that's ...    FigureCanvasAgg(f)    buf = io.BytesIO()    plt.savefig(buf, format='png')    plt.close(f)    response = HttpResponse(buf.getvalue(), content_type='image/png')    return response