class_docstr: File handler for Satpy's CF netCDF files.
docstr: Add information of existing datasets.
docstr_tok: ["Add","information","of","existing","datasets","."]
code: def _existing_datasets(self, configured_datasets=None):
      """Add information of existing datasets."""
      for is_avail, ds_info in configured_datasets or []:
          yield is_avail, ds_info
  
imports: import itertools
  import json
  import logging
  import xarray
  from pyresample import AreaDefinition
  from satpy.dataset.dataid import WavelengthRange
  from satpy.readers.file_handlers import BaseFileHandler
  from satpy.utils import get_legacy_chunk_size
label_desc: Use image node_id 6 for calling the SatpyCFFileHandler obj's underlying member method code with example usage: obj._existing_datasets(configured_datasets) without return types