class_docstr: Base class for common HDF4 operations.
class_docstr_tok: ["Base","class","for","common","HDF4","operations","."]
docstr: Check if item is in file content.
docstr_tok: ["Check","if","item","is","in","file","content","."]
code: def __contains__(self, item):
      """Check if item is in file content."""
      return item in self.file_content
  
file_path: satpy/satpy/readers/hdf4_utils.py
imports: import logging
  import dask.array
  import numpy
  import xarray
  from pyhdf.SD import SD, SDC, SDS
  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 HDF4FileHandler obj's underlying member method code with example usage: obj.__contains__(item) and returns: unknown