eccodes/examples/python/grib_get_keys.py

# Copyright 2005-2015 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 traceback
import sys

from eccodes import *

INPUT = '../../data/reduced_latlon_surface.grib1'
VERBOSE = 1  # verbose error reporting


def example():
    f = open(INPUT)

    keys = [
        'Ni',
        'Nj',
        'latitudeOfFirstGridPointInDegrees',
        'longitudeOfFirstGridPointInDegrees',
        'latitudeOfLastGridPointInDegrees',
        'longitudeOfLastGridPointInDegrees',
    ]

    while 1:
        gid = codes_grib_new_from_file(f)
        if gid is None:
            break

        for key in keys:
            try:
                print '  %s: %s' % (key, codes_get(gid, key))
            except CodesInternalError, err:
                print 'Error with key="%s" : %s' % (key, err.msg)

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

        codes_release(gid)

    f.close()


def main():
    try:
        example()
    except CodesInternalError, err:
        if VERBOSE:
            traceback.print_exc(file=sys.stderr)
        else:
            print >>sys.stderr, err.msg

        return 1

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