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 L{exec_command} or L{invoke_shell}
without a pty will ever have data on the stderr stream.

The optional C{mode} and C{bufsize} arguments are interpreted the
same way as by the built-in C{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: object which can be used for python file I/O.
@rtype: L{ChannelFile}

@since: 1.1