def __repr__(self):
        return "<Requirements({})>".format(self.filename.name or "")
def _read_soundings(sounding_file_name, sounding_field_names, radar_image_dict):
    """Reads storm-centered soundings and matches w storm-centered radar imgs.

    :param sounding_file_name: Path to input file (will be read by
        `soundings.read_soundings`).
    :param sounding_field_names: See doc for `soundings.read_soundings`.
    :param radar_image_dict: Dictionary created by
        `storm_images.read_storm_images`.
    :return: sounding_dict: Dictionary created by `soundings.read_soundings`.
    :return: radar_image_dict: Same as input, but excluding storm objects with
        no sounding.
    """

    print('Reading data from: "{0:s}"...'.format(sounding_file_name))
    sounding_dict, _ = soundings.read_soundings(
        netcdf_file_name=sounding_file_name,
        field_names_to_keep=sounding_field_names,
        full_id_strings_to_keep=radar_image_dict[storm_images.FULL_IDS_KEY],
        init_times_to_keep_unix_sec=radar_image_dict[
            storm_images.VALID_TIMES_KEY]
    )

    num_examples_with_soundings = len(sounding_dict[soundings.FULL_IDS_KEY])
    if num_examples_with_soundings == 0:
        return None, None

    radar_full_id_strings = numpy.array(
        radar_image_dict[storm_images.FULL_IDS_KEY]
    )
    orig_storm_times_unix_sec = (
        radar_image_dict[storm_images.VALID_TIMES_KEY] + 0
    )

    indices_to_keep = []

    for i in range(num_examples_with_soundings):
        this_index = numpy.where(numpy.logical_and(
            radar_full_id_strings == sounding_dict[soundings.FULL_IDS_KEY][i],
            orig_storm_times_unix_sec ==
            sounding_dict[soundings.INITIAL_TIMES_KEY][i]
        ))[0][0]

        indices_to_keep.append(this_index)

    indices_to_keep = numpy.array(indices_to_keep, dtype=int)
    radar_image_dict[storm_images.STORM_IMAGE_MATRIX_KEY] = radar_image_dict[
        storm_images.STORM_IMAGE_MATRIX_KEY
    ][indices_to_keep, ...]

    radar_image_dict[storm_images.FULL_IDS_KEY] = sounding_dict[
        soundings.FULL_IDS_KEY
    ]
    radar_image_dict[storm_images.VALID_TIMES_KEY] = sounding_dict[
        soundings.INITIAL_TIMES_KEY
    ]

    return sounding_dict, radar_image_dict