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d S)� BaseSelectora- Selector abstract base class.
A selector supports registering file objects to be monitored for specific
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A file object is a file descriptor or any object with a `fileno()` method.
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for example to store context information, a callback, etc.
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depending on the platform. The default `Selector` class uses the most
efficient implementation on the current platform.
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t � d S)a3 Register a file object.
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fileobj -- file object or file descriptor
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data -- attached data
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SelectorKey instance
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ValueError if events is invalid
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t � d S)aj Unregister a file object.
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