eccodes/examples/python/grib_set_keys.py

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# Copyright 2005-2017 ECMWF.
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#
# 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.
#
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# 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.
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import traceback
import sys
from eccodes import *
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from datetime import date
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from collections import OrderedDict
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INPUT = '../../data/regular_latlon_surface_constant.grib1'
OUTPUT = 'out.set.grib'
VERBOSE = 1 # verbose error reporting
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def example():
fin = open(INPUT)
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fout = open(OUTPUT, 'w')
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gid = codes_grib_new_from_file(fin)
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dt = date.today()
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today = "%d%02d%02d" % (dt.year, dt.month, dt.day)
codes_set(gid, 'dataDate', int(today))
codes_set(gid, 'centre', 80)
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centreIntVal = codes_get_array(gid, 'centre', int)
centreStrVal = codes_get_array(gid, 'centre', str)
dateStrVal = codes_get_array(gid, 'dataDate', str)
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assert(centreIntVal[0] == 80)
assert(centreStrVal[0] == 'cnmc')
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assert(dateStrVal[0] == today)
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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]
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# Now do the same but using set_key_vals, setting keys all at once
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print 'set keys using one long comma-separated string...'
codes_set_key_vals(gid, 'level=1,centre=98')
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assert(codes_get(gid, 'centre', str) == 'ecmf')
assert(codes_get(gid, 'level', int) == 1)
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print 'set keys using a list of strings...'
codes_set_key_vals(gid, ['level=2', 'centre=kwbc'])
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assert(codes_get(gid, 'centre', int) == 7)
assert(codes_get(gid, 'level', int) == 2)
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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)] ))
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assert(codes_get(gid, 'centre', str) == 'lfpw')
assert(codes_get(gid, 'level', int) == 3)
codes_gts_header(True)
codes_gts_header(False)
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codes_write(gid, fout)
codes_release(gid)
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fin.close()
fout.close()
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def main():
try:
example()
except CodesInternalError as err:
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if VERBOSE:
traceback.print_exc(file=sys.stderr)
else:
sys.stderr.write(err.msg + '\n')
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return 1
if __name__ == "__main__":
sys.exit(main())