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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_read_sample
#
# Description: read key values from a GRIB sample message.
#
import sys
import traceback
from eccodes import *
VERBOSE = 1 # verbose error reporting
def example(INPUT):
# open GRIB file
f = open(INPUT, "rb")
# These keys should be in the sample files
keys = [
"identifier",
"editionNumber",
"year",
"month",
"latitudeOfFirstGridPointInDegrees",
"longitudeOfFirstGridPointInDegrees",
"bitsPerValue",
"stepType",
"packingType",
]
cnt = 0
# Loop for the messages in the file
while 1:
gid = codes_grib_new_from_file(f)
if gid is None:
break
print("message: %s" % cnt)
for key in keys:
print(" %s=%s" % (key, codes_get(gid, key)))
cnt += 1
codes_release(gid)
f.close()
def main():
try:
example(sys.argv[1])
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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