(e.g, type checking), which is called twice, with different arguments,
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On Feb. 10, the FBI released images and video taken from the Nest camera of a masked, armed individual on the property at the time of the disappearance. This individual was seen attempting to tamper with the camera by tapping it and eventually covering the lens with foliage. Despite these attempts at concealment, Google, which owns Nest, was able to successfully recover the footage from the device’s back-end systems.
Option exposes whether it is None and gives access to the inner value:，推荐阅读体育直播获取更多信息