(self, fileobj)
Unregister a file object.

        Parameters:
        fileobj -- file object or file descriptor

        Returns:
        SelectorKey instance

        Raises:
        KeyError if fileobj is not registered

        Note:
        If fileobj is registered but has since been closed this does
        *not* raise OSError (even if the wrapped syscall does)
Unregister a file object.
Unregister a file object .
def unregister(self, fileobj):
        """Unregister a file object.

        Parameters:
        fileobj -- file object or file descriptor

        Returns:
        SelectorKey instance

        Raises:
        KeyError if fileobj is not registered

        Note:
        If fileobj is registered but has since been closed this does
        *not* raise OSError (even if the wrapped syscall does)
        """
        raise NotImplementedError
def unregister ( self , fileobj ) : raise NotImplementedError