class_docstr: The GzipFile class simulates most of the methods of a file object with
  the exception of the truncate() method.
  
  This class only supports opening files in binary mode. If you need to open a
  compressed file in text mode, use the gzip.open() function.
docstr: Invoke the underlying file object's fileno() method.
  
  This will raise AttributeError if the underlying file object
  doesn't support fileno().
docstr_tok: ["Invoke","the","underlying","file","object","'s","fileno","(",")","method",".","This","will","raise","AttributeError","if","the","underlying","file","object","does","n't","support","fileno","(",")","."]
code: def fileno(self):
      """Invoke the underlying file object's fileno() method.
  
      This will raise AttributeError if the underlying file object
      doesn't support fileno().
      """
      return self.fileobj.fileno()
  
imports: import struct, sys, time, os
  import zlib
  import builtins
  import io
  import _compression
label_desc: Use image node_id 14 for calling the GzipFile obj's underlying member method code with example usage: obj.fileno() and returns: self