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.
code: def filename(self):
      import warnings
  
      warnings.warn("use the name attribute", DeprecationWarning, 2)
      if self.mode == WRITE and self.name[-3:] != ".gz":
          return self.name + ".gz"
      return self.name
  
imports: import struct, sys, time, os
  import zlib
  import builtins
  import io
  import _compression
label_desc: Use image node_id 2 for calling the GzipFile obj's underlying member method code with example usage: obj.filename() and returns: self, unknown