Update app.py

app.py

@@ -10,7 +10,7 @@ def pd_bar():
 def pd_line():
     df = pd.DataFrame({'kc':['yw', 'sx', 'yy'], 'cj':[66, 98, 78]})
     ax = plt.plot(df['cj'])
-    return ax.get_figure()
+    return plt
 demo=gr.Blocks()
 with demo:
     gr.Markdown("# <center>图表渲染测试")