then the += will modify the list, and then raise an exception because you can’t assign to that tuple item because the tuple is immutable, but the list will have been mutated.
Preparing your iPhone for satellite useBefore heading somewhere with limited coverage, it is important to confirm that location services and Find My are properly configured. On the iPhone, open the Settings app and tap Privacy & Security, then select Location Services and ensure the feature is turned on. Scroll down to Find My and confirm that location access is set appropriately.，详情可参考WPS下载最新地址
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