json_serialization.py 文件源码

def default(self, obj):
        """Converts an ndarray into a dictionary for efficient serialization.

        The dict has three keys:
        - dtype : The datatype of the array as a string.
        - shape : The shape of the array as a tuple.
        - __ndarray__ : The data of the array as a list.

        Parameters
        ----------
        obj : :obj:`numpy.ndarray`
            The ndarray to encode.

        Returns
        -------
        :obj:`dict`
            The dictionary serialization of obj.

        Raises
        ------
        TypeError
            If obj isn't an ndarray.
        """
        if isinstance(obj, np.ndarray):
            return dict(__ndarray__=obj.tolist(),
                        dtype=str(obj.dtype),
                        shape=obj.shape)
        # Let the base class default method raise the TypeError
        return _json.JSONEncoder(self, obj)