class_docstr: Base file handler.
class_docstr_tok: ["Base","file","handler","."]
docstr: Initialize file handler.
docstr_tok: ["Initialize","file","handler","."]
code: def __init__(self, filename, filename_info, filetype_info):
      """Initialize file handler."""
      self.filename = filename
      self.navigation_reader = None
      self.filename_info = filename_info
      self.filetype_info = filetype_info
      self.metadata = filename_info.copy()
  
imports: import numpy
  import xarray
  from pyresample.geometry import SwathDefinition
  from satpy.dataset import combine_metadata
  from satpy.readers import open_file_or_filename
label_desc: Use image node_id 1 to create a new BaseFileHandler object  with example: obj = BaseFileHandler(filename, filename_info, filetype_info)