def load_grid(nc):
"""
Get a SGrid object from a netCDF4.Dataset or file/URL.
:param str or netCDF4.Dataset nc: a netCDF4 Dataset or URL/filepath
to the netCDF file
:return: SGrid object
:rtype: sgrid.SGrid
"""
if isinstance(nc, Dataset):
pass
else:
nc = Dataset(nc, 'r')
return SGrid.load_grid(nc)
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