class_docstr: Python implementation of a format encoder. Override this class and
  add the decoding logic in the :meth:`encode` method.
  
  See :ref:`Writing Your Own File Codec in Python<file-codecs-py>`
code: def pushes_fd(self):
      return self._pushes_fd
  
imports: import io
  import itertools
  import struct
  import sys
  from .None import Image
  from ._util import is_path
label_desc: Use image node_id 1 for calling the PyEncoder obj's underlying member method code with example usage: obj.pushes_fd() and returns: self