fields.py 文件源码

def get_stats(self, metrics, lang=UNSPECIFIED_TRANSLATION, limit=100):

        stats = super(NumField, self).get_stats(metrics, lang, limit)

        stats.update({
            'median': '*',
            'mean': '*',
            'mode': '*',
            'stdev': '*'
        })

        try:
            # require a non empty dataset
            stats['mean'] = statistics.mean(self.flatten_dataset(metrics))
            stats['median'] = statistics.median(self.flatten_dataset(metrics))
            # requires at least 2 values in the dataset
            stats['stdev'] = statistics.stdev(self.flatten_dataset(metrics),
                                              xbar=stats['mean'])
            # requires a non empty dataset and a unique mode
            stats['mode'] = statistics.mode(self.flatten_dataset(metrics))
        except statistics.StatisticsError:
            pass

        return stats