class_docstr: File handler for Satpy's CF netCDF files.
docstr: Get sensor set.
docstr_tok: ["Get","sensor","set","."]
code: def sensor_names(self):
      """Get sensor set."""
      sensors = set()
      for _, ds_info in self.available_datasets():
          try:
              sensors.add(ds_info["sensor"])
          except KeyError:
              continue
      return sensors
  
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 4 for calling the SatpyCFFileHandler obj's underlying member method code with example usage: obj.sensor_names() and returns: sensors