mirror of https://github.com/ecmwf/eccodes.git
91 lines
2.7 KiB
Python
91 lines
2.7 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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import sys
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import traceback
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from collections import OrderedDict
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from datetime import date
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from eccodes import *
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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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