abstractmethod unregister(fileobj)
Unregister a file object from selection, removing it from monitoring. A file object shall be unregistered prior to being closed.
fileobj must be a file object previously registered.
This returns the associated SelectorKey
instance, or raises a KeyError
if fileobj is not registered. It will raise ValueError
if fileobj is invalid (e.g. it has no fileno()
method or its fileno()
method has an invalid return value).
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