abstractmethod select(timeout=None)
Wait until some registered file objects become ready, or the timeout expires.
If timeout > 0, this specifies the maximum wait time, in seconds. If timeout <= 0, the call won’t block, and will report the currently ready file objects. If timeout is None, the call will block until a monitored file object becomes ready.
This returns a list of (key, events) tuples, one for each ready file object.
key is the SelectorKey instance corresponding to a ready file object. events is a bitmask of events ready on this file object.
Note
This method can return before any file object becomes ready or the timeout has elapsed if the current process receives a signal: in this case, an empty list will be returned.
Changed in version 3.5: The selector is now retried with a recomputed timeout when interrupted by a signal if the signal handler did not raise an exception (see PEP 475 for the rationale), instead of returning an empty list of events before the timeout.
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