read_file_backwards.py

def readfilerev(fd):
    buff = 256
    fd.seek(0,2)
    size = fd.tell()
    rem = size % buff
    #pos = max(0, (size / buff -1) * buff)
    line = ''
    pos = -1 
    while fd.tell() > 0:
        fd.seek(pos, 1)
        d = fd.read(1)
        if fd.tell() == 1:
            fd.seek(-1,1)
            yield d + line
        else:
            pos = -2
            if d != '\n':
                line = d+line
            else:
                if line:
                    yield line
                line = d