在Python中，我如何制作一个小部件（例如标签中的文本）淡入，然后输出？
我正在创建一个应用程序，目前正在开发引入序列。我想在一段时间之后让一系列文本淡入淡出，让用户有足够的时间阅读完整信息的每一部分。
有没有办法让文字和/或标签淡入淡出？
到目前为止，这是我的代码：
Crashed: com.apple.root.user-initiated-qos
0 Quickride 0x1002609d0 static NotificationPersistenceHelper.deleteNotificationsOfAGroup(String, groupValue : String) -> () (NotificationPersistenceHelper.swift:162)
1 Quickride 0x10019df64 specialized NotificationStore.removeOldNotificationOfSameGroupValue(String, groupValue : String) -> () (NotificationStore.swift:286)
2 Quickride 0x10019a46c NotificationStore.saveNewNotification(UserNotification) -> UserNotification (NotificationStore.swift)
3 Quickride 0x1001cb200 specialized NotificationHandler.saveNotification(UserNotification) -> UserNotification? (NotificationHandler.swift:58)
4 Quickride 0x1001c7fe4 NotificationHandler.saveNotification(UserNotification) -> UserNotification? (NotificationHandler.swift:40)
5 Quickride 0x1001c7e0c NotificationHandler.handleNewUserNotification(UserNotification) -> () (NotificationHandler.swift:29)
6 Quickride 0x1003dfbb8 specialized UserNotificationTopicListener.onMessageRecieved(String?, messageObject : AnyObject?) -> () (UserNotificationTopicListener.swift:24)
7 Quickride 0x1003df8e0 UserNotificationTopicListener.onMessageRecieved(String?, messageObject : AnyObject?) -> () (UserNotificationTopicListener.swift:18)
8 Quickride 0x1003fd918 specialized UserMessageTopicListener.onMessageRecieved(String?, messageObject : AnyObject?) -> () (UserMessageTopicListener.swift:19)
9 Quickride 0x1003fd104 UserMessageTopicListener.onMessageRecieved(String?, messageObject : AnyObject?) -> () (UserMessageTopicListener.swift:17)
10 Quickride 0x10011f8ac static MessageDispatchUtils.dispatchMessageToListeners(String, mqttMessage : MQTTMessage, listenerList : [TopicListener]) -> () (MessageDispatchUtils.swift)
11 Quickride 0x100181700 EventServiceProxy.(dispatchAllMessagesArrivedBeforeSessionWasInitialized() -> ()).(closure #1) (EventServiceProxy.swift)
12 libdispatch.dylib 0x192e31200 _dispatch_call_block_and_release + 24
13 libdispatch.dylib 0x192e311c0 _dispatch_client_callout + 16
14 libdispatch.dylib 0x192e41558 _dispatch_root_queue_drain + 1032
15 libdispatch.dylib 0x192e410ec _dispatch_worker_thread3 + 124
16 libsystem_pthread.dylib 0x1930392c8 _pthread_wqthread + 1288
17 libsystem_pthread.dylib 0x193038db4 start_wqthread + 4