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# (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.
# Python Implementation: grib_set_keys
#
# Description: how to set key values in GRIB messages
#
from __future__ import print_function
import traceback
import sys
from eccodes import *
from datetime import date
from collections import OrderedDict
INPUT = '../../data/regular_latlon_surface_constant.grib1'
OUTPUT = 'out.set.grib'
VERBOSE = 1 # verbose error reporting
def example():
fin = open(INPUT, 'rb')
fout = open(OUTPUT, 'wb')
gid = codes_grib_new_from_file(fin)
dt = date.today()
today = "%d%02d%02d" % (dt.year, dt.month, dt.day)
codes_set(gid, 'dataDate', int(today))
codes_set(gid, 'centre', 80)
centreIntVal = codes_get_array(gid, 'centre', int)
centreStrVal = codes_get_array(gid, 'centre', str)
dateStrVal = codes_get_array(gid, 'dataDate', str)
assert (centreIntVal[0] == 80)
assert (centreStrVal[0] == 'cnmc')
assert (dateStrVal[0] == today)
print('get centre as an integer - centre = %d' % centreIntVal[0])
print('get centre as a string - centre = %s' % centreStrVal[0])
print('get date as a string - date = %s' % dateStrVal[0])
# Now do the same but using set_key_vals, setting keys all at once
print('set keys using one long comma-separated string...')
codes_set_key_vals(gid, 'level=1,centre=98')
assert (codes_get(gid, 'centre', str) == 'ecmf')
assert (codes_get(gid, 'level', int) == 1)
print('set keys using a list of strings...')
codes_set_key_vals(gid, ['level=2', 'centre=kwbc'])
assert (codes_get(gid, 'centre', int) == 7)
assert (codes_get(gid, 'level', int) == 2)
print('set keys using a dictionary (order not as specified!)...')
codes_set_key_vals(gid, {'level': 3, 'centre': 84})
assert (codes_get(gid, 'centre', str) == 'lfpw')
assert (codes_get(gid, 'level', int) == 3)
print('set keys using an ordered dictionary...')
codes_set_key_vals(gid, OrderedDict([('level', 3), ('centre', 84)]))
assert (codes_get(gid, 'centre', str) == 'lfpw')
assert (codes_get(gid, 'level', int) == 3)
codes_gts_header(True)
codes_gts_header(False)
codes_write(gid, fout)
codes_release(gid)
fin.close()
fout.close()
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())
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