Update app.py

app.py

@@ -51,8 +51,9 @@ def Attandance(video):
               matchIndex = np.argmin(faceDis)
   
               if matches[matchIndex]:
-                  name = personNames[matchIndex].upper()             
-                  names.append(name)
+                  name = personNames[matchIndex].upper()   
+                  if names.count(name) == 0:
+                      names.append(name)
       
           cv2.waitKey(1)