Update app.py

app.py

@@ -49,8 +49,9 @@ def pyecharts1():
     bar.add_xaxis(["衬衫", "羊毛衫", "雪纺衫", "裤子", "高跟鞋", "袜子"])
     bar.add_yaxis("商家A", [5, 20, 36, 10, 75, 90])
     bar.render('test.html')
-    aa=open('test.html',"r",encoding="utf-8")
-    return 'test.html',aa.read()
+    with open('test.html',"r",encoding="utf-8") as aa:
+        bb=aa.read()
+    return 'test.html',bb
 def cff():
 
     df=pd.DataFrame([[0.2,0.4,0.6],[0.4,0.3,0.4],[0.4,0.5,0.2],[0.5,0.4,0.4]],columns=['a','b','c'])