索引

title: 索引

weight: 6

codes_index_new_from_file

iid = codes_index_new_from_file (file, keys)

返回创建的索引句柄。

codes_index_add_file

codes_index_add_file (iid, file)

添加一个文件到索引。

codes_index_write

codes_index_write (iid, file)

将索引写入文件，以便后续使用。

codes_index_read

iid = codes_index_read (file)

从 codes_index_write 输出的文件中加载索引。

codes_index_release

codes_index_release (iid)

释放索引。

codes_index_get_size

size = codes_index_get_size (iid, key)

索引 key 不重复的键值总数

codes_index_get

values = codes_index_get (iid, key, ktype=str)

获取索引 key 的不重复键值列表。

codes_index_select

codes_index_select (iid, key, value)

选择满足 key==value 的 GRIB 消息子集。

codes_new_from_index

与 codes_grib_new_from_file 相同，并使用 codes_release 释放消息。

示例：

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()