code: def _read_gzip_header(self):
      last_mtime = _read_gzip_header(self._fp)
      if last_mtime is None:
          return False
      self._last_mtime = last_mtime
      return True
  
imports: import struct, sys, time, os
  import zlib
  import builtins
  import io
  import _compression
label_desc: Use image node_id 3 for calling the _GzipReader obj's underlying member method code with example usage: obj._read_gzip_header() and returns: True, False