mirror of https://github.com/ecmwf/eccodes.git
80 lines
2.0 KiB
Python
80 lines
2.0 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_get_keys
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#
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# Description: how to get values using keys from GRIB messages
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#
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import sys
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import traceback
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from eccodes import *
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INPUT = "../../data/reduced_latlon_surface.grib1"
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VERBOSE = 1 # verbose error reporting
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def example():
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f = open(INPUT, "rb")
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keys = [
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"Ni",
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"Nj",
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"latitudeOfFirstGridPointInDegrees",
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"longitudeOfFirstGridPointInDegrees",
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"latitudeOfLastGridPointInDegrees",
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"longitudeOfLastGridPointInDegrees",
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]
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while 1:
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gid = codes_grib_new_from_file(f)
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if gid is None:
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break
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for key in keys:
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try:
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print(" %s: %s" % (key, codes_get(gid, key)))
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except KeyValueNotFoundError as err:
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# Full list of exceptions here:
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# https://confluence.ecmwf.int/display/ECC/Python+exception+classes
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print(' Key="%s" was not found: %s' % (key, err.msg))
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except CodesInternalError as err:
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print('Error with key="%s" : %s' % (key, err.msg))
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print(
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"There are %d values, average is %f, min is %f, max is %f"
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% (
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codes_get_size(gid, "values"),
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codes_get(gid, "average"),
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codes_get(gid, "min"),
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codes_get(gid, "max"),
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)
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)
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codes_release(gid)
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f.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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