python 绘图添加图例显示UserWarning: Legend does not support []
绘制不同条件的两条折线想用图例说明,但是不成功,图例不会正常显示。报错代码如下:importmatplotlib.pyplotaspltimportnumpyasnpimportpylabasplx=[1,2,3,4,5,6,7]labels=['S1(25%)','S1(50%)','S1(75%)','S2','S3(25%)','S3(50%)','S3(75%)']y1=[0.328,0.