mirror of https://github.com/ecmwf/eccodes.git
92 lines
2.8 KiB
Python
92 lines
2.8 KiB
Python
# (C) Copyright 2005- ECMWF.
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#
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# This software is licensed under the terms of the Apache Licence Version 2.0
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# which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
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#
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# In applying this licence, ECMWF does not waive the privileges and immunities
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# granted to it by virtue of its status as an intergovernmental organisation
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# nor does it submit to any jurisdiction.
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# Python Implementation: grib_set_keys
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#
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# Description: how to set key values in GRIB messages
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#
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from __future__ import print_function
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import traceback
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import sys
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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'
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OUTPUT = 'out.set.grib'
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VERBOSE = 1 # verbose error reporting
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def example():
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fin = open(INPUT, 'rb')
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fout = open(OUTPUT, 'wb')
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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)
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codes_set(gid, 'dataDate', int(today))
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codes_set(gid, 'centre', 80)
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centreIntVal = codes_get_array(gid, 'centre', int)
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centreStrVal = codes_get_array(gid, 'centre', str)
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dateStrVal = codes_get_array(gid, 'dataDate', str)
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assert (centreIntVal[0] == 80)
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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])
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print('get centre as a string - centre = %s' % centreStrVal[0])
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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...')
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codes_set_key_vals(gid, 'level=1,centre=98')
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assert (codes_get(gid, 'centre', str) == 'ecmf')
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assert (codes_get(gid, 'level', int) == 1)
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print('set keys using a list of strings...')
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codes_set_key_vals(gid, ['level=2', 'centre=kwbc'])
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assert (codes_get(gid, 'centre', int) == 7)
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assert (codes_get(gid, 'level', int) == 2)
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print('set keys using a dictionary (order not as specified!)...')
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codes_set_key_vals(gid, {'level': 3, 'centre': 84})
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assert (codes_get(gid, 'centre', str) == 'lfpw')
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assert (codes_get(gid, 'level', int) == 3)
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print('set keys using an ordered dictionary...')
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codes_set_key_vals(gid, OrderedDict([('level', 3), ('centre', 84)]))
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assert (codes_get(gid, 'centre', str) == 'lfpw')
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assert (codes_get(gid, 'level', int) == 3)
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codes_gts_header(True)
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codes_gts_header(False)
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codes_write(gid, fout)
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codes_release(gid)
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fin.close()
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fout.close()
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def main():
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try:
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example()
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except CodesInternalError as err:
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if VERBOSE:
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traceback.print_exc(file=sys.stderr)
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else:
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sys.stderr.write(err.msg + '\n')
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return 1
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if __name__ == "__main__":
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sys.exit(main())
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