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 peek(self, n):
      self._check_not_closed()
      if self.mode != READ:
          import errno
  
          raise OSError(
              errno.EBADF, "peek() on write-only GzipFile object"
          )
      return self._buffer.peek(n)
  
imports: import struct, sys, time, os
  import zlib
  import builtins
  import io
  import _compression
label_desc: Use image node_id 10 for calling the GzipFile obj's underlying member method code with example usage: obj.peek(n) and returns: self