Method modify

Lib/selectors.py:258–270

(self, fileobj, events, data=None)

        return key

    def modify(self, fileobj, events, data=None):
        try:
            key = self._fd_to_key[self._fileobj_lookup(fileobj)]
        except KeyError:
            raise KeyError("{!r} is not registered".format(fileobj)) from None
        if events != key.events:
            self.unregister(fileobj)
            key = self.register(fileobj, events, data)
        elif data != key.data:
            # Use a shortcut to update the data.
            key = key._replace(data=data)
            self._fd_to_key[key.fd] = key
        return key

    def close(self):
        self._fd_to_key.clear()