Update app.py

app.py

@@ -8,7 +8,9 @@ os.system(
 
 
 def inference(img):
-    os.system('mkdir test')
+    if not os.path.exists('test'):
+        os.system('mkdir test')
+    
     basewidth = 512
     wpercent = (basewidth / float(img.size[0]))
     hsize = int((float(img.size[1]) * float(wpercent)))