Update app.py

app.py

@@ -1,4 +1,9 @@
 import gradio as gr
+import pandas as pd
+def pd_bar():
+    df = pd.DataFrame({'lab':['A', 'B', 'C'], 'val':[10, 30, 20]})
+    ax = df.plot.bar(x='lab', y='val', rot=0)
+    return ax
 demo=gr.Blocks()
 with demo:
     gr.Markdown("# <center>图表渲染测试")
@@ -15,4 +20,8 @@ myChart.setOption(option);
 </html>
 '''
     gr.HTML(htmls)
+    with gr.tab('pd_bar'):
+        pd_button=gr.Button("pd_bar>>")
+        pd_output=gr.Plot(label="pd_chart1")
+        pd_button.click(pd_bar, inputs=[], outputs=pd_output)
 demo.launch()