如何使用 cdo 气候命令？

Question

I want to subset a NetCDF file to extract a sub-period with cdo.

I run the following code in spyder

 from cdo import *
cdo = Cdo()

cdo.select('startdate=2003-01-01,end_date=2016-12-31', input='PATH/temperature.nc', output='output.nc')

I use spyder 3.10 and have the message :

TypeError: expected str, bytes or os.PathLike object, not NoneType

when I run cdo = Cdo()

1. Maybe I should not run cdo in spyder?
2. Does the command is correct?

Answer 1

I recently had an issue with the Cdo() command after a homebrew upgrade on a mac, and uninstalling the cdo package and then reinstalling it solved it for me...

However, are you sure the error is in the cdo=Cdo() command? I notice you have an underscore in "end_date", is that a typo in your question or also in your code?

What about using seldate if you are only selecting dates?

from cdo import *
cdo = Cdo()
cdo.seldate('2003-01-01,2016-12-31', input='PATH/temperature.nc', output='output.nc')