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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _parse_cod_segment(cls, fptr):
 """Parse the COD segment. Parameters fptr : file Open file object. Returns ------- CODSegment The current COD segment. """

        offset = fptr.tell() - 2

        read_buffer = fptr.read(2)
        length, = struct.unpack('>H', read_buffer)

        read_buffer = fptr.read(length - 2)

        lst = struct.unpack_from('>BBHBBBBBB', read_buffer, offset=0)
        scod, prog, nlayers, mct, nr, xcb, ycb, cstyle, xform = lst

        if len(read_buffer) > 10:
            precinct_size = _parse_precinct_size(read_buffer[10:])
        else:
            precinct_size = None

        sop = (scod & 2) > 0
        eph = (scod & 4) > 0

        if sop or eph:
            cls._parse_tpart_flag = True
        else:
            cls._parse_tpart_flag = False

        pargs = (scod, prog, nlayers, mct, nr, xcb, ycb, cstyle, xform,
                 precinct_size)

        return CODsegment(*pargs, length=length, offset=offset)