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import xarray as xr

ds = xr.open_dataset("download.grib", engine= "cfgrib")

ds.to_netcdf("download.nc")

import xarray as xr
import argparse
import sys

def convert(input, output):

    try:
        ds = xr.open_dataset(
                        input,
                        engine='cfgrib',
                        backend_kwargs={'indexpath':''}
                        )

    except FileNotFoundError:
        sys.exit("File was not found : {}".format(input))

    ds.to_netcdf(output)


if __name__ == "__main__":

	parser = argparse.ArgumentParser(description='GRIB to NetCDF converter\n',
    		formatter_class=argparse.RawTextHelpFormatter)
	
    parser.add_argument('-i', dest='input', metavar='INPUT_FILE', required=True, help='INPUT_FILE')
	parser.add_argument('-o', dest='output', metavar='OUTPUT_FILE', required=True, help='OUTPUT_FILE')
	
	args = parser.parse_args()

	convert(args.input,args.output)