iid = codes_index_new_from_file (file, keys)
返回创建的索引句柄。
codes_index_add_file (iid, file)
添加一个文件到索引。
codes_index_write (iid, file)
将索引写入文件，以便后续使用。
iid = codes_index_read (file)
从 codes_index_write 输出的文件中加载索引。
codes_index_release (iid)
释放索引。
size = codes_index_get_size (iid, key)
索引 key 不重复的键值总数
values = codes_index_get (iid, key, ktype=str)
获取索引 key 的不重复键值列表。
codes_index_select (iid, key, value)
选择满足 key==value 的 GRIB 消息子集。
与 codes_grib_new_from_file 相同，并使用 codes_release 释放消息。
from __future__ import print_function
import click
import eccodes
@click.command()
@click.argument('file_path')
def cli(file_path):
index_id = eccodes.codes_index_new_from_file(str(file_path), ["paramId"])
eccodes.codes_index_add_file(index_id, str(file_path))
param_size = eccodes.codes_index_get_size(index_id, "paramId")
print("param id count:", param_size)
param_id_list = eccodes.codes_index_get(index_id, "paramId")
print("param id list:", param_id_list)
eccodes.codes_index_select(index_id, "paramId", '131')
handle = eccodes.codes_new_from_index(index_id)
while handle is not None:
short_name = eccodes.codes_get(handle, "shortName")
date = eccodes.codes_get(handle, "dataDate")
type_of_level = eccodes.codes_get(handle, "typeOfLevel")
level = eccodes.codes_get(handle, "level")
print(short_name, date, type_of_level, level)
eccodes.codes_release(handle)
handle = eccodes.codes_new_from_index(index_id)
if __name__ == "__main__":
cli()