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r_ t d j | ƒ ƒ ‚ n X| d k r„ t d j | ƒ ƒ ‚ n | S( sl Return a file descriptor from a file object. If
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A selector supports registering file objects to be monitored
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A file object is a file descriptor or any object with a
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file object which can be used for example to store context info,
a callback, etc.
A selector can use various implementations (select(), poll(), epoll(),
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the most efficient implementation for the current platform.
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