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I am trying to process some netcdf files while operator chaining for speed in python. When I chain more than two operators, I get an "too many inputs" error.

Testing the generated cdo command shows that the problem is the dash ('-') in front of the first operator. If I remove the dash and then run the command manually, it completes. Similarly, if I only use one chain (outcomment the "f'{terms} '" line in the code below), the script completes successfully.

I have not tested it without the sellonlatbox operator. But reordering the operators leads to the same result.

How can I successfully chain more than two operators?

  • Code + output is below.
  • Code extracted from some longer piece, therefore contains var-names to keep the original structure / combining code in case something is obviously wrong there. Sorry for the non-runability.
  • cdo 2.1.1 on (K)Ubuntu 23.04

The code:

terms = '-mulc,0.1'
bounding_box = '-2.2,-1.4,34.8,35.2'
str_chname = (
    f'-chname,{source_name},{target_name} '
    f'{terms} '
    f"{os.path.join(dir_input, f'fn_in}_{year}.nc')}"
)
cdo.sellonlatbox(bounding_box,
                 input=str_chname,
                 output=os.path.join(output_dir,
                                     f'{fn_out}.nc'))

Results in:

Error in calling operator sellonlatbox with:
>>> cdo -O -s -sellonlatbox,-2.2,-1.4,34.8,35.2 -chname,strd,lwdown −mulc,0.1 in/input.nc out/output.nc<<<

<snip>

                      ^ To many inputs

Thank you for your help.

Sven Berendsen
  • 1

1 Answers1

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Is it that you are missing a left brace on this line before fn_in?

f"{os.path.join(dir_input, f'fn_in}_{year}.nc')}"
F Horm
  • 13
  • 3