def __init__(self, *, fout=None, format=None, byteorder=sys.byteorder, nanosecond=False):
self._newflg = False    <EOL>self._fproot = fout     <EOL>self._buffer = dict()   <EOL>self._stream = list()   <EOL>self._endian = byteorder<EOL>self._nnsecd = nanosecond<EOL>self._foutio, self._fdpext = self.make_fout(fout, format)<EOL>
Initialise instance.

        Keyword arguments:
            * fout -- str, output path
            * format -- str, output format
            * byteorder -- str, output file byte order
            * nanosecond -- bool, output nanosecond-resolution file flag