def makefile_stderr(self, *params):
return ChannelStderrFile(*([self] + list(params)))<EOL>
Return a file-like object associated with this channel's stderr
stream.   Only channels using `exec_command` or `invoke_shell`
without a pty will ever have data on the stderr stream.

The optional ``mode`` and ``bufsize`` arguments are interpreted the
same way as by the built-in ``file()`` function in Python.  For a
client, it only makes sense to open this file for reading.  For a
server, it only makes sense to open this file for writing.

:return: `.ChannelFile` object which can be used for Python file I/O.

.. versionadded:: 1.1