How to use the apiritif.recorder.pop_events function in apiritif

def _process_apiritif_samples(self, sample, label):
        samples_processed = 0

        recording = apiritif.recorder.pop_events(from_ts=self.start_time, to_ts=self.end_time)
        if not recording:
            return samples_processed

        try:
            samples = self.apiritif_extractor.parse_recording(recording, sample)
        except BaseException as exc:
            print("Warning: Couldn't parse recording: %s" % exc)
            samples = []

        for sample in samples:
            samples_processed += 1
            self._process_sample(sample, label)

        return samples_processed