json存储格式问题

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问题:TypeError: Object of type 'int64' is not JSON serializable (或者float32)

class NpEncoder(json.JSONEncoder):
    def default(self, obj):
        if isinstance(obj, np.integer):
            return int(obj)
        elif isinstance(obj, np.floating):
            return float(obj)
        elif isinstance(obj, np.ndarray):
            return obj.tolist()
        else:
            return super(NpEncoder, self).default(obj)
json.dumps(cxy_data, ensure_ascii=False,cls=NpEncoder)