eccodes/examples/python/grib_count_messages.py

#
# (C) Copyright 2005- ECMWF.
#
# This software is licensed under the terms of the Apache Licence Version 2.0
# which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
#
# In applying this licence, ECMWF does not waive the privileges and immunities
# granted to it by virtue of its status as an intergovernmental organisation
# nor does it submit to any jurisdiction.
#

import sys
import traceback

from eccodes import *

INPUT = "../../data/tigge_pf_ecmwf.grib2"
VERBOSE = 1  # verbose error reporting


def example():
    f = open(INPUT, "rb")

    mcount = codes_count_in_file(f)
    gid_list = [codes_grib_new_from_file(f) for i in range(mcount)]

    f.close()

    keys = [
        "Ni",
        "Nj",
        "latitudeOfFirstGridPointInDegrees",
        "longitudeOfFirstGridPointInDegrees",
        "latitudeOfLastGridPointInDegrees",
        "longitudeOfLastGridPointInDegrees",
        "jDirectionIncrementInDegrees",
        "iDirectionIncrementInDegrees",
    ]

    for i in range(mcount):
        gid = gid_list[i]

        print("processing message number", i + 1)

        for key in keys:
            print("%s=%g" % (key, codes_get(gid, key)))

        print(
            "There are %d, average is %g, min is %g, max is %g"
            % (
                codes_get_size(gid, "values"),
                codes_get(gid, "average"),
                codes_get(gid, "min"),
                codes_get(gid, "max"),
            )
        )

        print("-" * 100)

        codes_release(gid)


def main():
    try:
        example()
    except CodesInternalError as err:
        if VERBOSE:
            traceback.print_exc(file=sys.stderr)
        else:
            sys.stderr.write(err.msg + "\n")

        return 1


if __name__ == "__main__":
    sys.exit(main())