class_docstr: Minimal read-only file object that prepends a string to the contents
  of an actual file. Shouldn't be used outside of gzip.py, as it lacks
  essential functionality.
code: def seek(self, off):
      self._read = None
      self._buffer = None
      return self.file.seek(off)
  
imports: import struct, sys, time, os
  import zlib
  import builtins
  import io
  import _compression
label_desc: Use image node_id 4 for calling the _PaddedFile obj's underlying member method code with example usage: obj.seek(off) and returns: self