导入包：
# grib api
import gribapi
from gribapi import *
# eccodes
import eccodes
from eccodes import *
提供底层，过程式的接口。
提供几乎与 C 接口一一对应的接口。
使用 NumPy 库处理数据值。
codes_grib_new_from_file
codes_any_new_from_file
codes_new_from_file
codes_new_from_samples
codes_new_from_message
codes_release
codes_get
codes_get_array
codes_get_values
CodesInternalError
codes_grib_find_nearest
codes_grib_iterator_new
codes_grib_iterator_next
codes_grib_iterator_delete
codes_index_new_from_file
codes_index_add_file
codes_index_write
codes_index_read
codes_index_release
codes_index_get_size
codes_index_get
codes_index_select
codes_new_from_index
codes_get
codes_set_array
codes_set_values
codes_clone