I'm trying to use the nco package to merge multiple netcdf files using ncrcat. This in itself is easy to do, but I'm unable to get past the second line:
from nco import Nco
nco=Nco()
mrms1= nc.Dataset("/Users/arian/project/data/mrms_20190501/20190501_190000.nc")
mrms2= nc.Dataset("/Users/arian/project/data/mrms_20190501/20190501_190500.nc")
nco.ncrcat(input=[mrms1, mrms2], output='testnet.nc')
Where the nco=Nco() gives the error:
TypeError: object of type 'NoneType' has no len()
Ordinarly I know this error arises when you try to get the length from nothing, but from what I understand this instance has to be created in order to use ncrcat in the script.
I made sure an updated version of both nco and pynco is on anaconda. I also tried using the cdo package to merge the files the files instead, but I get the same error. I've also used ncrcat as a command line in the terminal, but I get a "term is not recognized as a cmdlet, function, script file, or operable program" so that's a separate can of worms. Also, netCDF4.MFDataset doesn't work because the data doesn't have time dimension to aggregate, nor does xarray, which gives a TypeError: coercing to Unicode: need string or buffer, Dataset found.
Based on many hours of research, I feel the nco len() Typerror is the easiest to fix, but all help from anything I mentioned is welcome. Thanks in advance.
Two points
1) input must be a string of a filename or a list of strings of filenames
e.g input =["20190501_190000.nc", "20190501_190500.nc"]
2) I am no expert on conda but to run pynco the nco commands must be in your PATH environment variable